uk.org.ogsadai.activity
Class SynchronizedGrowablePipe

java.lang.Object
  |
  +--uk.org.ogsadai.activity.SynchronizedGrowablePipe

All Implemented Interfaces:

BlockReader, BlockWriter, Pipe

public class SynchronizedGrowablePipe

extends java.lang.Object

implements Pipe

This is a pipe designed to be shared between multiple writers threads and a single reader thread.

Author:

The OGSA-DAI Project Team

Field Summary

private static java.lang.String	COPYRIGHT_NOTICE Copyright statement
private static DAILogger	LOG Logger object for logging in this class
private boolean	mClosed Set to true when the pipe is closed.
private java.util.List	mData Stores the blocks that are put onto the pipe.

Constructor Summary

SynchronizedGrowablePipe()

Method Summary

void	close() Closes the block writer to indicate that there are no more blocks are to be written.
boolean	hasNext() Indicates whether or not there are any more blocks of data to be read from the block reader.
boolean	isOpen() Indicates whether or not the block writer is open for writing via the put method.
java.lang.Object	next() Gets the next block of data contained in the block reader.
void	put(java.lang.Object block) Writes the specified block of output data.
void	waitForBlock() Wait for a block of data to appear on the pipe.

Methods inherited from class java.lang.Object

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

Field Detail

COPYRIGHT_NOTICE

private static final java.lang.String COPYRIGHT_NOTICE

Copyright statement

See Also:

Constant Field Values

LOG

private static final DAILogger LOG

Logger object for logging in this class

mData

private final java.util.List mData

Stores the blocks that are put onto the pipe.

mClosed

private boolean mClosed

Set to true when the pipe is closed.

Constructor Detail

SynchronizedGrowablePipe

public SynchronizedGrowablePipe()

Method Detail

next

public java.lang.Object next()

Description copied from interface: BlockReader

Gets the next block of data contained in the block reader.

Specified by:

next in interface BlockReader

Returns:

an Object

close

public void close()

Description copied from interface: BlockWriter

Closes the block writer to indicate that there are no more blocks are to be written. After close has been called, the put method should no longer be used.

Specified by:

close in interface BlockWriter

put

public void put(java.lang.Object block)

Description copied from interface: BlockWriter

Writes the specified block of output data.

Specified by:

put in interface BlockWriter

Parameters:

block - the Object block to write

hasNext

public boolean hasNext()

Description copied from interface: BlockReader

Indicates whether or not there are any more blocks of data to be read from the block reader.

Specified by:

hasNext in interface BlockReader

Returns:

true if there are more blocks to be read or false otherwise

waitForBlock

public void waitForBlock()

Wait for a block of data to appear on the pipe.

isOpen

public boolean isOpen()

Description copied from interface: BlockWriter

Indicates whether or not the block writer is open for writing via the put method. After the close method has been invoked this method should return false.

Specified by:

isOpen in interface BlockWriter

Returns:

A boolean value indicating whether this block writer is open for writing