org.neo4j.kernel.impl.index
Class IndexCommand.DeleteCommand

java.lang.Object
  org.neo4j.kernel.impl.transaction.xaframework.XaCommand
      org.neo4j.kernel.impl.index.IndexCommand
          org.neo4j.kernel.impl.index.IndexCommand.DeleteCommand

Enclosing class:

IndexCommand

public static class IndexCommand.DeleteCommand
extends IndexCommand

Nested Class Summary

Nested classes/interfaces inherited from class org.neo4j.kernel.impl.index.IndexCommand

IndexCommand.AddCommand, IndexCommand.AddRelationshipCommand, IndexCommand.CreateCommand, IndexCommand.DeleteCommand, IndexCommand.RemoveCommand

Field Summary

Fields inherited from class org.neo4j.kernel.impl.index.IndexCommand

NODE, RELATIONSHIP

Method Summary

boolean	isConsideredNormalWriteCommand()
void	writeToFile(LogBuffer buffer) When a command is added to a transaction (usually when it is created) it must be written to the XaLogicalLog.

Methods inherited from class org.neo4j.kernel.impl.index.IndexCommand

endNodeNeedsLong, equals, execute, getEntityId, getEntityType, getIndexNameId, getKeyId, getValue, needsLong, putIntOrLong, readCommand, startNodeNeedsLong, writeHeader

Methods inherited from class org.neo4j.kernel.impl.transaction.xaframework.XaCommand

isRecovered, rollback, setRecovered

Methods inherited from class java.lang.Object

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

Method Detail

writeToFile

public void writeToFile(LogBuffer buffer)
                 throws IOException

Description copied from class: XaCommand

When a command is added to a transaction (usually when it is created) it must be written to the XaLogicalLog. This method should write all the data that is needed to re-create the command (see XaCommandFactory).

Write the data to the fileChannel, you can use the buffer supplied or create your own buffer since its capacity is very small (137 bytes or something). Acccess to writing commands is synchronized, only one command will be written at a time so if you need to write larger data sets the commands can share the same buffer.

Don't throw an IOException to imply something is wrong with the command. An exception should only be thrown here if there is a real IO failure. If something is wrong with this command it should have been detected when it was created.

Don't force, position or anything except normal forward write with the file channel.

Overrides:

writeToFile in class IndexCommand

Parameters:

buffer - A small byte buffer that can be used to write command data

Throws:

IOException - In case of *real* IO failure

isConsideredNormalWriteCommand

public boolean isConsideredNormalWriteCommand()

Overrides:

isConsideredNormalWriteCommand in class IndexCommand