Package org.aspectj.org.eclipse.jdt.internal.core.nd.db

Class ChunkWriter

java.lang.Object

org.aspectj.org.eclipse.jdt.internal.core.nd.db.ChunkWriter

public class ChunkWriter
extends Object

Combines sequential small writes into larger writes and that ensures that writes don't happen faster than a certain maximum rate.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static interface	ChunkWriter.SleepCallback
static interface	ChunkWriter.WriteCallback	Interface used to perform the uninterruptable writes when the buffer fills up.

Constructor Summary

Constructors

Constructor	Description
ChunkWriter(int bufferSize, double maxBytesPerMillisecond, ChunkWriter.WriteCallback callback)	Constructs a new ChunkWriter

Method Summary

Modifier and Type	Method	Description
boolean	flush()	Flushes any outstanding writes to disk immediately.
long	getBytesWritten()	Returns the total number of bytes written
long	getTotalWriteTimeMs()	Returns the total time spent in calls to ChunkWriter.WriteCallback.write(ByteBuffer, long).
void	setSleepFunction(ChunkWriter.SleepCallback callback)	Overrides the sleep callback function.
boolean	write(long position, byte[] data)	Writes the given bytes to the given file position.

Methods inherited from class java.lang.Object

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

Constructor Details

ChunkWriter

public ChunkWriter(int bufferSize,
 double maxBytesPerMillisecond,
 ChunkWriter.WriteCallback callback)

Constructs a new ChunkWriter

Parameters:

bufferSize - size of the write buffer (the maximum number of bytes that will be written in a single write).

maxBytesPerMillisecond - the maximum number of bytes that will be written per second. If an attempt is made to write more rapidly than this, the thread will be put to sleep.

callback - will be invoked to perform the writes

Method Details

write

public boolean write(long position,
 byte[] data)
              throws IOException

Writes the given bytes to the given file position.

Returns:

true iff any attempt was made to interrupt the thread using Thread.interrupt(). The write succeeds regardless of the return value.

Throws:

IOException - if unable to perform the write

flush

public boolean flush()
              throws IOException

Flushes any outstanding writes to disk immediately.

Returns:

true iff any attempt was made to interrupt the thread using Thread.interrupt(). The write succeeds regardless of the return value.

Throws:

IOException - if unable to perform the write

setSleepFunction

public void setSleepFunction(ChunkWriter.SleepCallback callback)

Overrides the sleep callback function.

getBytesWritten

public long getBytesWritten()

Returns the total number of bytes written

getTotalWriteTimeMs

public long getTotalWriteTimeMs()

Returns the total time spent in calls to ChunkWriter.WriteCallback.write(ByteBuffer, long).