com.bigdata.journal
Class DropIndexTask

java.lang.Object
  com.bigdata.journal.AbstractTask
      com.bigdata.journal.DropIndexTask

All Implemented Interfaces:

ITask, Callable

public class DropIndexTask
extends AbstractTask

Drop a named index (unisolated write operation).

Note: the dropped index will continue to be visible to unisolated readers or read-commmitted isolated operations (since they read from the most recent committed state) until the next commit. However, unisolated writers that execute after the index has been dropped will NOT be able to see the index.

Version:

$Id: DropIndexTask.java 2265 2009-10-26 12:51:06Z thompsonbry $

Author:

Bryan Thompson

Nested Class Summary

Nested classes/interfaces inherited from class com.bigdata.journal.AbstractTask

AbstractTask.DelegateTask<T>, AbstractTask.InnerReadWriteTxServiceCallable, AbstractTask.InnerWriteServiceCallable<T>, AbstractTask.ResubmitException

Field Summary

Fields inherited from class com.bigdata.journal.AbstractTask

checkpointNanoTime, concurrencyManager, DEBUG, INFO, isReadWriteTx, log, nanoTime_assignedWorker, nanoTime_beginWork, nanoTime_finishedWork, nanoTime_submitTask, readOnly, resourceManager, taskCounters, timestamp, transactionManager, tx

Constructor Summary

DropIndexTask(IConcurrencyManager concurrencyManager, String name)

Method Summary

Object

doTask() Drop the named index.

Methods inherited from class com.bigdata.journal.AbstractTask

assertResource, assertRunning, assertUnisolated, call, clearLoggingContext, dropIndex, getCommitTime, getIndex, getJournal, getOnlyResource, getResource, getResourceManager, getTaskCounters, getTaskName, getTimestamp, isResource, registerIndex, setupLoggingContext, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

DropIndexTask

public DropIndexTask(IConcurrencyManager concurrencyManager,
                     String name)

Method Detail

doTask

public Object doTask()
              throws Exception

Drop the named index.

Specified by:

doTask in class AbstractTask

Returns:

A Boolean value that is true iff the index was pre-existing at the time that this task executed and therefore was dropped. false is returned iff the index did not exist at the time that this task was executed.

Throws:

Exception - The exception that will be thrown by AbstractTask.call() iff the operation fails.

InterruptedException - This exception SHOULD be thrown if Thread.interrupted() becomes true during execution.