org.apache.lucene.util
Class TwoPhaseCommitTool.TwoPhaseCommitWrapper

java.lang.Object
  org.apache.lucene.util.TwoPhaseCommitTool.TwoPhaseCommitWrapper

All Implemented Interfaces:

TwoPhaseCommit

Enclosing class:

TwoPhaseCommitTool

public static final class TwoPhaseCommitTool.TwoPhaseCommitWrapper
extends Object
implements TwoPhaseCommit

A wrapper of a TwoPhaseCommit, which delegates all calls to the wrapped object, passing the specified commitData. This object is useful for use with TwoPhaseCommitTool.execute(TwoPhaseCommit...) if one would like to store commitData as part of the commit.

Constructor Summary

TwoPhaseCommitTool.TwoPhaseCommitWrapper(TwoPhaseCommit tpc, Map<String,String> commitData)

Method Summary

void	commit() The second phase of a 2-phase commit.
void	commit(Map<String,String> commitData) Like TwoPhaseCommit.commit(), but takes an additional commit data to be included w/ the commit.
void	prepareCommit() The first stage of a 2-phase commit.
void	prepareCommit(Map<String,String> commitData) Like TwoPhaseCommit.commit(), but takes an additional commit data to be included w/ the commit.
void	rollback() Discards any changes that have occurred since the last commit.

Methods inherited from class java.lang.Object

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

Constructor Detail

TwoPhaseCommitTool.TwoPhaseCommitWrapper

public TwoPhaseCommitTool.TwoPhaseCommitWrapper(TwoPhaseCommit tpc,
                                                Map<String,String> commitData)

Method Detail

prepareCommit

public void prepareCommit()
                   throws IOException

Description copied from interface: TwoPhaseCommit

The first stage of a 2-phase commit. Implementations should do as much work as possible in this method, but avoid actual committing changes. If the 2-phase commit fails, TwoPhaseCommit.rollback() is called to discard all changes since last successful commit.

Specified by:

prepareCommit in interface TwoPhaseCommit

Throws:

IOException

prepareCommit

public void prepareCommit(Map<String,String> commitData)
                   throws IOException

Description copied from interface: TwoPhaseCommit

Like TwoPhaseCommit.commit(), but takes an additional commit data to be included w/ the commit.

NOTE: some implementations may not support any custom data to be included w/ the commit and may discard it altogether. Consult the actual implementation documentation for verifying if this is supported.

Specified by:

prepareCommit in interface TwoPhaseCommit

Throws:

IOException

See Also:

TwoPhaseCommit.prepareCommit()

commit

public void commit()
            throws IOException

Description copied from interface: TwoPhaseCommit

The second phase of a 2-phase commit. Implementations should ideally do very little work in this method (following TwoPhaseCommit.prepareCommit(), and after it returns, the caller can assume that the changes were successfully committed to the underlying storage.

Specified by:

commit in interface TwoPhaseCommit

Throws:

IOException

commit

public void commit(Map<String,String> commitData)
            throws IOException

Description copied from interface: TwoPhaseCommit

Like TwoPhaseCommit.commit(), but takes an additional commit data to be included w/ the commit.

Specified by:

commit in interface TwoPhaseCommit

Throws:

IOException

See Also:

TwoPhaseCommit.commit(), TwoPhaseCommit.prepareCommit(Map)

rollback

public void rollback()
              throws IOException

Description copied from interface: TwoPhaseCommit

Discards any changes that have occurred since the last commit. In a 2-phase commit algorithm, where one of the objects failed to TwoPhaseCommit.commit() or TwoPhaseCommit.prepareCommit(), this method is used to roll all other objects back to their previous state.

Specified by:

rollback in interface TwoPhaseCommit

Throws:

IOException