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com.tangosol.io.journal
Interface Journal

All Superinterfaces:

com.oracle.common.base.Disposable

All Known Implementing Classes:

AbstractJournalRM.JournalImpl, BackupJournalRM.JournalImpl, RamJournalRM.JournalImpl

public interface Journal

extends com.oracle.common.base.Disposable

The Journal interface represents data that is written as part of a stream of updates, with the ability to identify writes (and later read them) using a ticket system. The Journal does not support erasure, but does allow the Journal to discard data that has been written previously as long as it has been "released" via this interface.

Since:

Coherence 3.7

Author:

cp 2010-06-10

Nested Class Summary

static interface

Journal.JournalConsumer An interface that represents the actions that a Journal may request of an object that uses the Journal.

Method Summary

Binary	read(long lTicket) Using a ticket returned from a previous call to write(com.tangosol.util.Binary), read the Binary value that was written to the Journal.
int	release(long lTicket) Notify the Journal that the value corresponding to the specified ticket is no longer needed.
long	write(Binary bin) Write a Binary value to the Journal and return a ticket for it.

Methods inherited from interface com.oracle.common.base.Disposable

dispose

Method Detail

write

long write(Binary bin)

Write a Binary value to the Journal and return a ticket for it.

Parameters:

bin - the Binary to write to the Journal

Returns:

the ticket that can later be used to access the Binary

read

Binary read(long lTicket)

Using a ticket returned from a previous call to write(com.tangosol.util.Binary), read the Binary value that was written to the Journal.

Parameters:

lTicket - a ticket returned from a previous call to write(com.tangosol.util.Binary)

Returns:

the Binary value that was previously written

Throws:

java.lang.IllegalStateException - may be thrown if the passed ticket had already been released

release

int release(long lTicket)

Notify the Journal that the value corresponding to the specified ticket is no longer needed.

Parameters:

lTicket - a ticket returned from a previous call to write(com.tangosol.util.Binary)

Returns:

the number of bytes released

Throws:

java.lang.IllegalStateException - may be thrown if the passed ticket had already been released

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