org.jlab.coda.jevio

Class EventWriter

java.lang.Object

org.jlab.coda.jevio.EventWriter

All Implemented Interfaces:

java.lang.AutoCloseable

public final class EventWriter
extends java.lang.Object
implements java.lang.AutoCloseable

An EventWriter object is used for writing events to a file or to a byte buffer. This class does NOT write versions 1-4 data, only version 6! This class is not thread-safe.

            FILE Uncompressed

    +----------------------------------+
    +                                  +
    +      General File Header         +
    +                                  +
    +----------------------------------+
    +----------------------------------+
    +                                  +
    +     Index Array (optional)       +
    +                                  +
    +----------------------------------+
    +----------------------------------+
    +      User Header (optional)      +
    +        --------------------------+
    +       |        Padding           +
    +----------------------------------+
    +----------------------------------+
    +                                  +
    +          Data Record 1           +
    +                                  +
    +----------------------------------+
                    .
                    .
                    .
    +----------------------------------+
    +                                  +
    +          Data Record N           +
    +                                  +
    +----------------------------------+

 ---------------------------------------------
 ---------------------------------------------

              FILE Compressed

    +----------------------------------+
    +                                  +
    +      General File Header         +
    +                                  +
    +----------------------------------+
    +----------------------------------+
    +                                  +
    +     Index Array (optional)       +
    +                                  +
    +----------------------------------+
    +----------------------------------+
    +      User Header (optional)      +
    +        --------------------------+
    +       |         Padding          +
    +----------------------------------+
    +----------------------------------+
    +           Compressed             +
    +          Data Record 1           +
    +                                  +
    +----------------------------------+
                    .
                    .
                    .
    +----------------------------------+
    +           Compressed             +
    +          Data Record N           +
    +                                  +
    +----------------------------------+

    The User Header contains a data record which
    holds the dictionary and first event, if any.
    The general file header, index array, and
    user header are never compressed.

    Writing a buffer is done without the general file header
    and the index array and user header which follow.
    

 

Author:

timmer

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
(package private) class	EventWriter.RecordCompressor Class used to take data-filled record from supply, compress it, and release it back to the supply.
(package private) class	EventWriter.RecordWriter Class used to take data-filled record from supply, write it, and release it back to the supply.

Constructor Summary

Constructors

Constructor and Description
EventWriter(java.nio.ByteBuffer buf) Create an EventWriter for writing events to a ByteBuffer.
EventWriter(java.nio.ByteBuffer buf, int maxRecordSize, int maxEventCount, java.lang.String xmlDictionary, int recordNumber, CompressionType compressionType) Create an EventWriter for writing events to a ByteBuffer.
EventWriter(java.nio.ByteBuffer buf, java.lang.String xmlDictionary) Create an EventWriter for writing events to a ByteBuffer.
EventWriter(java.io.File file) Creates an EventWriter for writing to a file in native byte order.
EventWriter(java.io.File file, boolean append) Creates an EventWriter for writing to a file in native byte order.
EventWriter(java.io.File file, java.lang.String dictionary, boolean append) Creates an EventWriter for writing to a file in NATIVE byte order.
EventWriter(java.lang.String filename) Creates an EventWriter for writing to a file in native byte order.
EventWriter(java.lang.String filename, boolean append) Creates an EventWriter for writing to a file in NATIVE byte order.
EventWriter(java.lang.String filename, boolean append, java.nio.ByteOrder byteOrder) Creates an EventWriter for writing to a file in the specified byte order.
EventWriter(java.lang.String baseName, java.lang.String directory, java.lang.String runType, int runNumber, long split, int maxRecordSize, int maxEventCount, java.nio.ByteOrder byteOrder, java.lang.String xmlDictionary, boolean overWriteOK, boolean append, EvioBank firstEvent, int streamId, int splitNumber, int splitIncrement, int streamCount, CompressionType compressionType, int compressionThreads, int ringSize, int bufferSize) Create an EventWriter for writing events to a file.

Method Summary

Modifier and Type	Method and Description
void	close() This method flushes any remaining data to file and disables this object.
protected void	examineFileHeader() Reads part of the file header in order to determine the evio version # and endianness of the file in question.
void	flush() This method flushes any remaining internally buffered data to file.
int	getBlockNumber() Get the current block (record) number.
java.nio.ByteBuffer	getByteBuffer() If writing to a file, return null.
java.nio.ByteOrder	getByteOrder() Get the byte order of the buffer/file being written into.
int	getBytesWrittenToBuffer() If writing to a buffer, get the number of bytes written to it including the trailer.
java.lang.String	getCurrentFilename() Get the name of the current file being written to.
java.lang.String	getCurrentFilePath() Get the full name or path of the current file being written to.
int	getEventsWritten() Get the number of events written to a file/buffer.
int	getRecordNumber() Get the current record number.
int	getSplitCount() Get the number of split files produced by this writer.
int	getSplitNumber() Get the current split number which is the split number of file to be written next.
boolean	hasRoom(int bytes) Is there room to write this many bytes to an output buffer as a single event? Will always return true when writing to a file.
boolean	isClosed() Has close() been called (without reopening by calling setBuffer(ByteBuffer)) ?
boolean	isDiskFull() If writing file, is the partition it resides on full? Not full, in this context, means there's enough space to write a full split file + a full record + an extra 10MB as a safety factor.
void	setBuffer(java.nio.ByteBuffer buf) Set the buffer being written into (initially set in constructor).
void	setBuffer(java.nio.ByteBuffer buf, java.util.BitSet bitInfo, int recordNumber) Set the buffer being written into (initially set in constructor).
void	setEventType(int type) Set the bit info of a record header for a specified CODA event type.
void	setFirstEvent(java.nio.ByteBuffer buffer) Set an event which will be written to the file as well as to all split files.
void	setFirstEvent(EvioBank bank) Set an event which will be written to the file as well as to all split files.
void	setFirstEvent(EvioNode node) Set an event which will be written to the file as well as to all split files.
void	setSourceId(int sourceId) Set the value of the source Id in the first block header.
void	setStartingBlockNumber(int startingRecordNumber) Set the number with which to start block (record) numbers.
void	setStartingRecordNumber(int startingRecordNumber) Set the number with which to start record numbers.
boolean	toFile() Is this object writing to file?
boolean	writeEvent(java.nio.ByteBuffer bankBuffer) Write an event (bank) into a record in evio/hipo version 6 format.
boolean	writeEvent(java.nio.ByteBuffer bankBuffer, boolean force) Write an event (bank) into a record in evio/hipo version 6 format.
boolean	writeEvent(EvioBank bank) Write an event (bank) into a record in evio/hipo version 6 format.
boolean	writeEvent(EvioBank bank, boolean force) Write an event (bank) into a record in evio/hipo version 6 format.
boolean	writeEvent(EvioNode node, boolean force) Write an event (bank) into a record in evio/hipo version 6 format.
boolean	writeEvent(EvioNode node, boolean force, boolean duplicate) Write an event (bank) into a record in evio/hipo version 6 format.
boolean	writeEventToFile(EvioBank bank, java.nio.ByteBuffer bankBuffer, boolean force) Write an event (bank) into a record and eventually to a file in evio/hipo version 6 format.
boolean	writeEventToFile(EvioNode node, boolean force, boolean duplicate) Write an event (bank) into a record and eventually to a file in evio/hipo version 6 format.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

EventWriter

public EventWriter(java.io.File file)
            throws EvioException

Creates an EventWriter for writing to a file in native byte order. If the file already exists, its contents will be overwritten. If it doesn't exist, it will be created.

Parameters:

file - the file object to write to.

Throws:

EvioException - file cannot be created

EventWriter

public EventWriter(java.io.File file,
                   boolean append)
            throws EvioException

Creates an EventWriter for writing to a file in native byte order. If the file already exists, its contents will be overwritten unless it is being appended to. If it doesn't exist, it will be created.

Parameters:

file - the file object to write to.

append - if true and the file already exists, all events to be written will be appended to the end of the file.

Throws:

EvioException - file cannot be created

EventWriter

public EventWriter(java.io.File file,
                   java.lang.String dictionary,
                   boolean append)
            throws EvioException

Creates an EventWriter for writing to a file in NATIVE byte order. If the file already exists, its contents will be overwritten unless it is being appended to. If it doesn't exist, it will be created.

Parameters:

file - the file object to write to.

dictionary - dictionary in xml format or null if none.

append - if true and the file already exists, all events to be written will be appended to the end of the file.

Throws:

EvioException - file cannot be created

EventWriter

public EventWriter(java.lang.String filename)
            throws EvioException

Creates an EventWriter for writing to a file in native byte order. If the file already exists, its contents will be overwritten. If it doesn't exist, it will be created.

Parameters:

filename - name of the file to write to.

Throws:

EvioException - file cannot be created

EventWriter

public EventWriter(java.lang.String filename,
                   boolean append)
            throws EvioException

Creates an EventWriter for writing to a file in NATIVE byte order. If the file already exists, its contents will be overwritten unless it is being appended to. If it doesn't exist, it will be created.

Parameters:

filename - name of the file to write to.

append - if true and the file already exists, all events to be written will be appended to the end of the file.

Throws:

EvioException - file cannot be created

EventWriter

public EventWriter(java.lang.String filename,
                   boolean append,
                   java.nio.ByteOrder byteOrder)
            throws EvioException

Creates an EventWriter for writing to a file in the specified byte order. If the file already exists, its contents will be overwritten unless it is being appended to. If it doesn't exist, it will be created.

Parameters:

filename - name of the file to write to.

append - if true and the file already exists, all events to be written will be appended to the end of the file.

byteOrder - the byte order in which to write the file.

Throws:

EvioException - file cannot be created

EventWriter

public EventWriter(java.lang.String baseName,
                   java.lang.String directory,
                   java.lang.String runType,
                   int runNumber,
                   long split,
                   int maxRecordSize,
                   int maxEventCount,
                   java.nio.ByteOrder byteOrder,
                   java.lang.String xmlDictionary,
                   boolean overWriteOK,
                   boolean append,
                   EvioBank firstEvent,
                   int streamId,
                   int splitNumber,
                   int splitIncrement,
                   int streamCount,
                   CompressionType compressionType,
                   int compressionThreads,
                   int ringSize,
                   int bufferSize)
            throws EvioException

Create an EventWriter for writing events to a file. If the file already exists, its contents will be overwritten unless the "overWriteOK" argument is false in which case an exception will be thrown. Unless ..., the option to append these events to an existing file is true, in which case everything is fine. If the file doesn't exist, it will be created. Byte order defaults to big endian if arg is null. File can be split while writing.

The base file name may contain up to 2, C-style integer format specifiers using "d" and "x" (such as %03d, or %x). If more than 2 are found, an exception will be thrown. If no "0" precedes any integer between the "%" and the "d" or "x" of the format specifier, it will be added automatically in order to avoid spaces in the file name. The first specifier will be substituted with the given runNumber value. If the file is being split, the second will be substituted with the split number which starts at 0. If 2 specifiers exist and the file is not being split, no substitutions are made. If no specifier for the splitNumber exists, it is tacked onto the end of the file name after a dot (.). If streamCount > 1, the split number is calculated starting with streamId and incremented by streamCount each time. In this manner, all split files will have unique, sequential names even though there are multiple parallel ERs.

The base file name may contain characters of the form $(ENV_VAR) which will be substituted with the value of the associated environmental variable or a blank string if none is found.

The base file name may also contain occurrences of the string "%s" which will be substituted with the value of the runType arg or nothing if the runType is null.

If multiple streams of data, each writing a file, end up with the same file name, they can be difcompressionferentiated by a stream id, starting split # and split increment.

Parameters:

baseName - base file name used to generate complete file name (may not be null)

directory - directory in which file is to be placed

runType - name of run type configuration to be used in naming files

runNumber - number of the CODA run, used in naming files

split - if < 1, do not split file, write to only one file of unlimited size. Else this is max size in bytes to make a file before closing it and starting writing another.

maxRecordSize - max number of uncompressed data bytes each record can hold. Value of < 8MB results in default of 8MB. The size of the record will not be larger than this size unless a single event itself is larger.

maxEventCount - max number of events each record can hold. Value <= O means use default (1M).

byteOrder - the byte order in which to write the file. This is ignored if appending to existing file. Defaults to Big Endian if null.

xmlDictionary - dictionary in xml format or null if none.

overWriteOK - if false and the file already exists, an exception is thrown rather than overwriting it.

append - if true append written data to given file.

firstEvent - the first event written into each file (after any dictionary) including all split files; may be null. Useful for adding common, static info into each split file.

streamId - streamId number (100 > id > -1) for file name

splitNumber - number at which to start the split numbers

splitIncrement - amount to increment split number each time another file is created.

streamCount - total number of streams in DAQ.

compressionType - type of data compression to do (0=none, 1=lz4 fast, 2=lz4 best, 3=gzip).

compressionThreads - number of threads doing compression simultaneously.

ringSize - number of records in supply ring. If set to < compressionThreads, it is forced to equal that value and is also forced to be a multiple of 2, rounded up.

bufferSize - number of bytes to make each internal buffer which will be storing events before writing them to a file. 9MB = default if bufferSize = 0.

Throws:

EvioException - if maxRecordSize or maxEventCount exceed limits; if streamCount > 1 and streamId < 0; if defined dictionary or first event while appending; if splitting file while appending; if file name arg is null; if file could not be opened, positioned, or written to; if file exists but user requested no over-writing or appending; if streamId < 0, splitNumber < 0, or splitIncrement < 1.

EventWriter

public EventWriter(java.nio.ByteBuffer buf)
            throws EvioException

Create an EventWriter for writing events to a ByteBuffer. Uses the default number and size of records in buffer. Will overwrite any existing data in buffer!

Parameters:

buf - the buffer to write to.

Throws:

EvioException - if buf arg is null

EventWriter

public EventWriter(java.nio.ByteBuffer buf,
                   java.lang.String xmlDictionary)
            throws EvioException

Create an EventWriter for writing events to a ByteBuffer. Uses the default number and size of records in buffer.

Parameters:

buf - the buffer to write to.

xmlDictionary - dictionary in xml format or null if none.

Throws:

EvioException - if buf arg is null

EventWriter

public EventWriter(java.nio.ByteBuffer buf,
                   int maxRecordSize,
                   int maxEventCount,
                   java.lang.String xmlDictionary,
                   int recordNumber,
                   CompressionType compressionType)
            throws EvioException

Create an EventWriter for writing events to a ByteBuffer. The buffer's position is set to 0 before writing.

Parameters:

buf - the buffer to write to starting at position = 0.

maxRecordSize - max number of data bytes each record can hold. Value of < 8MB results in default of 8MB. The size of the record will not be larger than this size unless a single event itself is larger.

maxEventCount - max number of events each record can hold. Value <= O means use default (1M).

xmlDictionary - dictionary in xml format or null if none.

recordNumber - number at which to start record number counting.

compressionType - type of data compression to do (0=none, 1=lz4 fast, 2=lz4 best, 3=gzip)

Throws:

EvioException - if maxRecordSize or maxEventCount exceed limits; if buf arg is null;

Method Detail

isDiskFull

public boolean isDiskFull()

If writing file, is the partition it resides on full? Not full, in this context, means there's enough space to write a full split file + a full record + an extra 10MB as a safety factor.

Returns:

true if the partition the file resides on is full, else false.

setBuffer

public void setBuffer(java.nio.ByteBuffer buf,
                      java.util.BitSet bitInfo,
                      int recordNumber)
               throws EvioException

Set the buffer being written into (initially set in constructor). This method allows the user to avoid having to create a new EventWriter each time a bank needs to be written to a different buffer. This does nothing if writing to a file.

Do not use this method unless you know what you are doing.

Parameters:

buf - the buffer to write to.

bitInfo - set of bits to include in first record header.

recordNumber - number at which to start record number counting.

Throws:

EvioException - if this object was not closed prior to resetting the buffer, buffer arg is null, or writing to file.

setBuffer

public void setBuffer(java.nio.ByteBuffer buf)
               throws EvioException

Set the buffer being written into (initially set in constructor). This method allows the user to avoid having to create a new EventWriter each time a bank needs to be written to a different buffer. This does nothing if writing to a file.

Do not use this method unless you know what you are doing.

Parameters:

buf - the buffer to write to.

Throws:

EvioException - if this object was not closed prior to resetting the buffer, buffer arg is null, or writing to file.

getByteBuffer

public java.nio.ByteBuffer getByteBuffer()

If writing to a file, return null. If writing to a buffer, get a duplicate of the user-given buffer being written into. The buffer's position will be 0 and its limit will be the size of the valid data. Basically, it's ready to be read from. The returned buffer shares data with the original buffer but has separate limit, position, and mark. Useful if trying to send buffer over the network.

Returns:

buffer being written into, made ready for reading; null if writing to file

setSourceId

public void setSourceId(int sourceId)

Set the value of the source Id in the first block header. Only necessary to do this when using EventWriter in EMU's RocSimulation module. Only the ROC sends sourceId in header. In evio 6, the source id is stored in user register 1. In earlier versions it's stored in reserved1. This should only be used internally by CODA in emu software.

Parameters:

sourceId - value of the source Id.

setEventType

public void setEventType(int type)

Set the bit info of a record header for a specified CODA event type. Must be called AFTER RecordHeader.setBitInfo(boolean, boolean) or RecordHeader.setBitInfoWord(int) in order to have change preserved. This should only be used internally by CODA in emu software.

Parameters:

type - event type (0=ROC raw, 1=Physics, 2=Partial Physics, 3=Disentangled, 4=User, 5=Control, 15=Other, else = nothing set).

toFile

public boolean toFile()

Is this object writing to file?

Returns:

true if writing to file, else false.

isClosed

public boolean isClosed()

Has close() been called (without reopening by calling setBuffer(ByteBuffer)) ?

Returns:

true if this object closed, else false.

getCurrentFilename

public java.lang.String getCurrentFilename()

Get the name of the current file being written to. Returns null if no file.

Returns:

the name of the current file being written to.

getBytesWrittenToBuffer

public int getBytesWrittenToBuffer()

If writing to a buffer, get the number of bytes written to it including the trailer.

Returns:

number of bytes written to buffer

getCurrentFilePath

public java.lang.String getCurrentFilePath()

Get the full name or path of the current file being written to. Returns null if no file.

Returns:

the full name or path of the current file being written to.

getSplitNumber

public int getSplitNumber()

Get the current split number which is the split number of file to be written next. Warning, this value may be changing.

Returns:

the current split number which is the split number of file to be written next.

getSplitCount

public int getSplitCount()

Get the number of split files produced by this writer.

Returns:

number of split files produced by this writer.

getBlockNumber

public int getBlockNumber()

Get the current block (record) number. Warning, this value may be changing.

Returns:

the current block (record) number.

getRecordNumber

public int getRecordNumber()

Get the current record number. Warning, this value may be changing.

Returns:

the current record number.

getEventsWritten

public int getEventsWritten()

Get the number of events written to a file/buffer. Remember that a particular event may not yet be flushed to the file/buffer. If the file being written to is split, the returned value refers to all split files taken together.

Returns:

number of events written to a file/buffer.

getByteOrder

public java.nio.ByteOrder getByteOrder()

Get the byte order of the buffer/file being written into.

Returns:

byte order of the buffer/file being written into.

setStartingBlockNumber

public void setStartingBlockNumber(int startingRecordNumber)

Set the number with which to start block (record) numbers. This method does nothing if events have already been written.

Parameters:

startingRecordNumber - the number with which to start block (record) numbers.

setStartingRecordNumber

public void setStartingRecordNumber(int startingRecordNumber)

Set the number with which to start record numbers. This method does nothing if events have already been written.

Parameters:

startingRecordNumber - the number with which to start record numbers.

setFirstEvent

public void setFirstEvent(EvioNode node)
                   throws EvioException,
                          java.io.IOException

Set an event which will be written to the file as well as to all split files. It's called the "first event" as it will be the first event written to each split file if this method is called early enough or the first event was defined in the constructor. In evio version 6, any dictionary and the first event are written to a common record which is stored in the user-header part of the file header if writing to a file. The common record data is never compressed.

FILE: Since this method can only be called after the constructor, the common record may have already been written with its dictionary and possibly another firstEvent. If that is the case, the event given here will be written immediately somewhere in the body of the file. Any subsequent splits will have this event as the first event in the file header. On the other hand, if the common record has not yet been written to the file, this event becomes the first event in the file header.

BUFFER: By its nature this method is not all that useful for writing to a buffer since the buffer is never split. For that reason it throws an exception.

Parameters:

node - node representing event to be placed first in each file written including all splits. If null, no more first events are written to any files.

Throws:

java.io.IOException - if error writing to file

EvioException - if first event is opposite byte order of internal buffer; if bad data format; if close() already called; if writing to buffer; if file could not be opened for writing; if file exists but user requested no over-writing; if no room when writing to user-given buffer;

setFirstEvent

public void setFirstEvent(java.nio.ByteBuffer buffer)
                   throws EvioException,
                          java.io.IOException

Set an event which will be written to the file as well as to all split files. It's called the "first event" as it will be the first event written to each split file if this method is called early enough or the first event was defined in the constructor. In evio version 6, any dictionary and the first event are written to a common record which is stored in the user-header part of the file header if writing to a file. When writing to a buffer it's stored in the first record's user-header. The common record data is never compressed.

FILE: Since this method can only be called after the constructor, the common record may have already been written with its dictionary and possibly another firstEvent. If that is the case, the event given here will be written immediately somewhere in the body of the file. Any subsequent splits will have this event as the first event in the file header. On the other hand, if the common record has not yet been written to the file, this event becomes the first event in the file header.

BUFFER: By its nature this method is not all that useful for writing to a buffer since the buffer is never split. For that reason it throws an exception.

Parameters:

buffer - buffer containing event to be placed first in each file written including all splits. If null, no more first events are written to any files.

Throws:

java.io.IOException - if error writing to file

EvioException - if first event is opposite byte order of internal buffer; if bad data format; if close() already called; if writing to buffer; if file could not be opened for writing; if file exists but user requested no over-writing; if no room when writing to user-given buffer;

setFirstEvent

public void setFirstEvent(EvioBank bank)
                   throws EvioException,
                          java.io.IOException

Set an event which will be written to the file as well as to all split files. It's called the "first event" as it will be the first event written to each split file if this method is called early enough or the first event was defined in the constructor. In evio version 6, any dictionary and the first event are written to a common record which is stored in the user-header part of the file header if writing to a file. When writing to a buffer it's stored in the first record's user-header. The common record data is never compressed.

FILE: Since this method can only be called after the constructor, the common record may have already been written with its dictionary and possibly another firstEvent. If that is the case, the event given here will be written immediately somewhere in the body of the file. Any subsequent splits will have this event as the first event in the file header. On the other hand, if the common record has not yet been written to the file, this event becomes the first event in the file header.

BUFFER: By its nature this method is not all that useful for writing to a buffer since the buffer is never split. For that reason it throws an exception.

Parameters:

bank - event to be placed first in each file written including all splits. If null, no more first events are written to any files.

Throws:

java.io.IOException - if error writing to file

EvioException - if first event is opposite byte order of internal buffer; if bad data format; if close() already called; if writing to buffer; if file could not be opened for writing; if file exists but user requested no over-writing; if no room when writing to user-given buffer;

flush

public void flush()

This method flushes any remaining internally buffered data to file. Calling close() automatically does this so it isn't necessary to call before closing. This method should only be used when writing events at such a low rate that it takes an inordinate amount of time for internally buffered data to be written to the file.

Calling this may easily kill performance.

close

public void close()

This method flushes any remaining data to file and disables this object.

Specified by:

close in interface java.lang.AutoCloseable

examineFileHeader

protected void examineFileHeader()
                          throws java.io.IOException,
                                 EvioException

Reads part of the file header in order to determine the evio version # and endianness of the file in question.

Throws:

EvioException - not in append mode, contains too little data, is not in proper format, version earlier than 6, and all other exceptions.

java.io.IOException - premature EOF or file reading error.

hasRoom

public boolean hasRoom(int bytes)

Is there room to write this many bytes to an output buffer as a single event? Will always return true when writing to a file.

Parameters:

bytes - number of bytes to write

Returns:

true if there still room in the output buffer, else false.

writeEvent

public boolean writeEvent(EvioNode node,
                          boolean force)
                   throws EvioException,
                          java.io.IOException

Write an event (bank) into a record in evio/hipo version 6 format. Once the record is full and if writing to a file (for multiple compression threads), the record will be sent to a thread which may compress the data, then it will be sent to a thread to write the record to file. If there is only 1 compression thread, it's all done in the thread which call this method.

If writing to a buffer, once the record is full this method returns false - indicating that the last event was NOT written to the record. To finish the writing process, call close(). This will compress the data if desired and then write it to the buffer.

The buffer must contain only the event's data (event header and event data) and must not be in complete evio file format. Do not call this while simultaneously calling close, flush, setFirstEvent, or getByteBuffer.

Be warned that injudicious use of a true 2nd arg, the force flag, will kill performance when writing to a file.

This method is not used to write the dictionary or the first event which are both placed in the common record which, in turn, is the user header part of the file header.

Parameters:

node - object representing the event to write in buffer form

force - if writing to disk, force it to write event to the disk.

Returns:

if writing to buffer: true if event was added to record, false if buffer full, record event count limit exceeded, or bank and bankBuffer args are both null.

Throws:

java.io.IOException - if error writing file

EvioException - if event is opposite byte order of internal buffer; if close() already called; if bad eventBuffer format; if file could not be opened for writing; if file exists but user requested no over-writing; if null node arg;

writeEvent

public boolean writeEvent(EvioNode node,
                          boolean force,
                          boolean duplicate)
                   throws EvioException,
                          java.io.IOException

Write an event (bank) into a record in evio/hipo version 6 format. Once the record is full and if writing to a file (for multiple compression threads), the record will be sent to a thread which may compress the data, then it will be sent to a thread to write the record to file. If there is only 1 compression thread, it's all done in the thread which call this method.

If writing to a buffer, once the record is full this method returns false - indicating that the last event was NOT written to the record. To finish the writing process, call close(). This will compress the data if desired and then write it to the buffer.

The buffer must contain only the event's data (event header and event data) and must not be in complete evio file format. Do not call this while simultaneously calling close, flush, setFirstEvent, or getByteBuffer.

Be warned that injudicious use of a true 2nd arg, the force flag, will kill performance when writing to a file. A true 3rd arg can be used when the backing buffer of the node is accessed by multiple threads simultaneously. This allows that buffer's limit and position to be changed without interfering with the other threads.

This method is not used to write the dictionary or the first event which are both placed in the common record which, in turn, is the user header part of the file header.

Parameters:

node - object representing the event to write in buffer form

force - if writing to disk, force it to write event to the disk.

duplicate - if true, duplicate node's buffer so its position and limit can be changed without issue.

Returns:

if writing to buffer: true if event was added to record, false if buffer full, record event count limit exceeded, or bank and bankBuffer args are both null.

Throws:

java.io.IOException - if error writing file

EvioException - if event is opposite byte order of internal buffer; if close() already called; if bad eventBuffer format; if file could not be opened for writing; if file exists but user requested no over-writing; if null node arg;

writeEventToFile

public boolean writeEventToFile(EvioNode node,
                                boolean force,
                                boolean duplicate)
                         throws EvioException,
                                java.io.IOException

Write an event (bank) into a record and eventually to a file in evio/hipo version 6 format. Once the record is full and if writing with multiple compression threads, the record will be sent to a thread which may compress the data, then it will be sent to a thread to write the record to file. If there is only 1 compression thread, it's all done in the thread which call this method.

If splitting files, this method returns false if disk partition is too full to write the complete, next split file. If force arg is true, write anyway. DO NOT mix calling this method with calling writeEvent(EvioBank, ByteBuffer, boolean) (or the various writeEvent() methods which call it). Results are unpredictable as it messes up the logic used to quit writing to full disk. The buffer must contain only the event's data (event header and event data) and must not be in complete evio file format.

Be warned that injudicious use of a true 2nd arg, the force flag, will kill performance when writing to a file. A true 3rd arg can be used when the backing buffer of the node is accessed by multiple threads simultaneously. This allows that buffer's limit and position to be changed without interfering with the other threads.

This method is not used to write the dictionary or the first event which are both placed in the common record which, in turn, is the user header part of the file header.

Parameters:

node - object representing the event to write in buffer form

force - if writing to disk, force it to write event to the disk.

duplicate - if true, duplicate node's buffer so its position and limit can be changed without issue.

Returns:

true if event was added to record. If splitting files, false if disk partition too full to write the complete, next split file. False if interrupted. If force arg is true, write anyway.

Throws:

java.io.IOException - if error writing file

EvioException - if event is opposite byte order of internal buffer; if close() already called; if bad eventBuffer format; if file could not be opened for writing; if file exists but user requested no over-writing; if null node arg;

writeEvent

public boolean writeEvent(java.nio.ByteBuffer bankBuffer)
                   throws EvioException,
                          java.io.IOException

Write an event (bank) into a record in evio/hipo version 6 format. Once the record is full and if writing to a file (for multiple compression threads), the record will be sent to a thread which may compress the data, then it will be sent to a thread to write the record to file. If there is only 1 compression thread, it's all done in the thread which call this method.

If writing to a buffer, once the record is full this method returns false - indicating that the last event was NOT written to the record. To finish the writing process, call close(). This will compress the data if desired and then write it to the buffer.

The buffer must contain only the event's data (event header and event data) and must not be in complete evio file format. Do not call this while simultaneously calling close, flush, setFirstEvent, or getByteBuffer.

This method is not used to write the dictionary or the first event which are both placed in the common record which, in turn, is the user header part of the file header.

Parameters:

bankBuffer - the bank (as a ByteBuffer object) to write.

Returns:

if writing to buffer: true if event was added to record, false if buffer full, record event count limit exceeded, or bank and bankBuffer args are both null.

Throws:

java.io.IOException - if error writing file

EvioException - if event is opposite byte order of internal buffer; if close() already called; if bad eventBuffer format; if file could not be opened for writing; if file exists but user requested no over-writing.

writeEvent

public boolean writeEvent(java.nio.ByteBuffer bankBuffer,
                          boolean force)
                   throws EvioException,
                          java.io.IOException

Write an event (bank) into a record in evio/hipo version 6 format. Once the record is full and if writing to a file (for multiple compression threads), the record will be sent to a thread which may compress the data, then it will be sent to a thread to write the record to file. If there is only 1 compression thread, it's all done in the thread which call this method.

If writing to a buffer, once the record is full this method returns false - indicating that the last event was NOT written to the record. To finish the writing process, call close(). This will compress the data if desired and then write it to the buffer.

The buffer must contain only the event's data (event header and event data) and must not be in complete evio file format. Do not call this while simultaneously calling close, flush, setFirstEvent, or getByteBuffer.

Be warned that injudicious use of a true 2nd arg, the force flag, will kill performance when writing to a file. This method is not used to write the dictionary or the first event which are both placed in the common record which, in turn, is the user header part of the file header.

Parameters:

bankBuffer - the bank (as a ByteBuffer object) to write.

force - if writing to disk, force it to write event to the disk.

Returns:

if writing to buffer: true if event was added to record, false if buffer full, record event count limit exceeded, or bank and bankBuffer args are both null.

Throws:

java.io.IOException - if error writing file

EvioException - if event is opposite byte order of internal buffer; if close() already called; if bad eventBuffer format; if file could not be opened for writing; if file exists but user requested no over-writing.

writeEvent

public boolean writeEvent(EvioBank bank)
                   throws EvioException,
                          java.io.IOException

Write an event (bank) into a record in evio/hipo version 6 format. Once the record is full and if writing to a file (for multiple compression threads), the record will be sent to a thread which may compress the data, then it will be sent to a thread to write the record to file. If there is only 1 compression thread, it's all done in the thread which call this method.

If writing to a buffer, once the record is full this method returns false - indicating that the last event was NOT written to the record. To finish the writing process, call close(). This will compress the data if desired and then write it to the buffer.

Do not call this while simultaneously calling close, flush, setFirstEvent, or getByteBuffer.

This method is not used to write the dictionary or the first event which are both placed in the common record which, in turn, is the user header part of the file header.

Parameters:

bank - the bank to write.

Returns:

if writing to buffer: true if event was added to record, false if buffer full, record event count limit exceeded, or bank and bankBuffer args are both null.

Throws:

java.io.IOException - if error writing file

EvioException - if close() already called; if file could not be opened for writing; if file exists but user requested no over-writing;.

writeEvent

public boolean writeEvent(EvioBank bank,
                          boolean force)
                   throws EvioException,
                          java.io.IOException

Write an event (bank) into a record in evio/hipo version 6 format. Once the record is full and if writing to a file (for multiple compression threads), the record will be sent to a thread which may compress the data, then it will be sent to a thread to write the record to file. If there is only 1 compression thread, it's all done in the thread which call this method.

If writing to a buffer, once the record is full this method returns false - indicating that the last event was NOT written to the record. To finish the writing process, call close(). This will compress the data if desired and then write it to the buffer.

Do not call this while simultaneously calling close, flush, setFirstEvent, or getByteBuffer.

This method is not used to write the dictionary or the first event which are both placed in the common record which, in turn, is the user header part of the file header.

Be warned that injudicious use of the 2nd arg, the force flag, will kill performance when writing to a file.

Parameters:

bank - the bank to write.

force - if writing to disk, force it to write event to the disk.

Returns:

if writing to buffer: true if event was added to record, false if buffer full, record event count limit exceeded, or bank and bankBuffer args are both null.

Throws:

java.io.IOException - if error writing file

EvioException - if close() already called; if file could not be opened for writing; if file exists but user requested no over-writing;.

writeEventToFile

public boolean writeEventToFile(EvioBank bank,
                                java.nio.ByteBuffer bankBuffer,
                                boolean force)
                         throws EvioException,
                                java.io.IOException

Write an event (bank) into a record and eventually to a file in evio/hipo version 6 format. Once the record is full and if writing with multiple compression threads, the record will be sent to a thread which may compress the data, then it will be sent to a thread to write the record to file. If there is only 1 compression thread, it's all done in the thread which call this method.

If splitting files, this method returns false if disk partition is too full to write the complete, next split file. If force arg is true, write anyway. DO NOT mix calling this method with calling writeEvent(EvioBank, ByteBuffer, boolean) (or the various writeEvent() methods which call it). Results are unpredictable as it messes up the logic used to quit writing to full disk. The event to be written may be in one of two forms. The first is as an EvioBank object and the second is as a ByteBuffer containing only the event's data (event header and event data) and must not be in complete evio file format. The first non-null of the bank arguments will be written.

Be warned that injudicious use of a true 2nd arg, the force flag, will kill performance when writing to a file.

This method is not used to write the dictionary or the first event which are both placed in the common record which, in turn, is the user header part of the file header.

Parameters:

bank - the bank (as an EvioBank object) to write.

bankBuffer - the bank (as a ByteBuffer object) to write.

force - if writing to disk, force it to write event to the disk.

Returns:

true if event was added to record. If splitting files, false if disk partition too full to write the complete, next split file. False if interrupted. If force arg is true, write anyway.

Throws:

java.io.IOException - if error writing file

EvioException - if event is opposite byte order of internal buffer; if both buffer args are null; if bad bankBuffer format; if close() already called; if not writing to file; if file could not be opened for writing; if file exists but user requested no over-writing.