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SnappyData store based off Pivotal GemFireXD
/*
* Copyright (c) 2010-2015 Pivotal Software, Inc. All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you
* may not use this file except in compliance with the License. You
* may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
* implied. See the License for the specific language governing
* permissions and limitations under the License. See accompanying
* LICENSE file.
*/
package com.gemstone.gemfire.internal.cache;
import java.nio.ByteBuffer;
import com.gemstone.gemfire.cache.RegionEvent;
/**
* This interface is used by testing/debugging code to be notified of query
* events. See the documentation for class CacheObserverHolder for details. Also
* the callback is issued only if the boolean ISSUE_CALLBACKS_TO_CACHE_OBSERVER
* present in com.gemstone.gemfire.internal.cache.LocalRegion is made true
*
* @author Asif
*/
public interface CacheObserver
{
/**
* Called just after the region's Map is cleared & before Listener callback is
* issued. The call to this method is synchronous
*/
void afterRegionClear(RegionEvent event);
/**
* Called just beforeclearing the DiskRegion.
*
*/
void beforeDiskClear();
/**
* callback to test flushing efficieny. This callback is issued just before
* the flushing of the buffer that is before writing data to the Oplog, but
* after setting the logical offsets in the DiskIds contained in the
* PendingWrite Buffer
*
*/
void goingToFlush();
/**
* called immediately after bytes are written to the disk Region. In case of
* asynch mode, it gets called immedaitely after the asynch writer has written
* it to disk & just before releasing the ByteBuffer to the pool.
*
*/
public void afterWritingBytes();
/**
*
* Compacting is about to compact
*/
public void beforeGoingToCompact();
/**
* Just finished Compacting
*
*/
public void afterHavingCompacted();
/**
* Callback just after calculating the conflated byte buffer. This function
* can get called only in the asynch mode where conflation can happen
*
* @param origBB
* Original ByteBuffer object for the operation without considering
* conflation
* @param conflatedBB
* Resultant ByteBuffer object after conflation
*/
public void afterConflation(ByteBuffer origBB, ByteBuffer conflatedBB);
/**
* Callback just after setting oplog offset . The Oplog Offset will be set to
* non negative number in case it is a synch mode operation as the offset for
* synch mode is available in the context of thread performing the operation &
* to -1 for an asynch mode of operation as in case of asynch mode of
* operation the actual offset is determined only when asynch writer performs
* the write operation.
*
* @param offset
* A non negative number for synch mode of operation indicating the
* start position in the Oplog for the operation & -1 for asynch mode
* of operation
*
*/
public void afterSettingOplogOffSet(long offset);
/**
* Callback given by the thread performing the operation which causes the
* switching of the Oplog. This function gets invoked before a new Oplog gets
* created. Thus if the compacting is on , this function will get called before
* the compacter thread gets notified
*
*/
public void beforeSwitchingOplog();
/**
* Callback given by the thread performing the operation which causes the
* switching of the Oplog. This function gets invoked after a new Oplog gets
* created. Thus if the compacting is on , this function will get called after
* the compacter thread has been notified & the switching thread has been able to
* create a new Oplog
*
*
*/
public void afterSwitchingOplog();
/**
* Callback given by the thread which creates krfs.
*/
public void afterKrfCreated();
/**
* Callback given immediately before any thread invokes
* ComplexDiskRegion.OplogCompactor's stopCompactor method. This method normally
* gets invoked by clear/destory/close methods of the region.
*
*/
public void beforeStoppingCompactor();
/**
* Callback given immediately after any thread invokes
* ComplexDiskRegion.OplogCompactor's stopCompactor method. This method normally
* gets invoked by clear/destory/close methods of the region.
*
*/
public void afterStoppingCompactor();
/**
* Callback given immediately after the
* ComplexDiskRegion.OplogCompactor's stopCompactor method
* signals the compactor to stop.
*
*/
public void afterSignallingCompactor();
/**
* Called when GII begins
*/
public void afterMarkingGIIStarted();
/**
* Called when GII ends
*/
public void afterMarkingGIICompleted();
/**
* Called after the Oplog.WriterThread (asynch writer thread) swaps the
* pendingFlushMap and pendingWriteMap for flushing.
*/
public void afterSwitchingWriteAndFlushMaps();
/**
* Invoked just before setting the LBHTree reference in the thread local.
*/
public void beforeSettingDiskRef();
/**
* Invoked just after setting the LBHTree reference in the thread local.
*/
public void afterSettingDiskRef();
/**
* Invoked by the compactor thread just before deleting a compacted oplog
* @param compactedOplog
*/
public void beforeDeletingCompactedOplog(Oplog compactedOplog);
/**
* Invoked just before deleting an empty oplog
* @param emptyOplog
*/
public void beforeDeletingEmptyOplog(Oplog emptyOplog);
/**
* to simulate crash like scenario where latest krf could not get formed
* we will stop the system from generating krf and irf and see whether index
* recovery happened properly or not and on subsequent restart it should not
* use the crf for loading the indexes.
* @return TODO
*/
public boolean shouldCreateKRFIRF();
public void afterRegionCustomEntryConcurrentHashMapClear();
}