com.tangosol.net.partition.ObservableSplittingBackingMap Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of coherence Show documentation
Show all versions of coherence Show documentation
Oracle Coherence Community Edition
/*
* Copyright (c) 2000, 2020, Oracle and/or its affiliates.
*
* Licensed under the Universal Permissive License v 1.0 as shown at
* http://oss.oracle.com/licenses/upl.
*/
package com.tangosol.net.partition;
import com.oracle.coherence.common.base.Disposable;
import com.tangosol.net.BackingMapManager;
import com.tangosol.net.BackingMapManagerContext;
import com.tangosol.net.cache.CacheEvent;
import com.tangosol.net.cache.CacheMap;
import com.tangosol.net.cache.CacheStatistics;
import com.tangosol.util.ClassHelper;
import com.tangosol.util.Filter;
import com.tangosol.util.MapEvent;
import com.tangosol.util.MapListener;
import com.tangosol.util.MapListenerSupport;
import com.tangosol.util.ObservableMap;
import com.tangosol.util.WrapperObservableMap;
import java.util.Collections;
import java.util.Iterator;
import java.util.Map;
/**
* An observable, cache-aware PartitionAwareBackingMap implementation.
*
* @since Coherence 3.5
* @author cp 2009-01-09
*/
public class ObservableSplittingBackingMap
extends WrapperObservableMap
implements CacheMap, Disposable, PartitionAwareBackingMap
{
// ----- constructors ---------------------------------------------------
/**
* Create a ObservableSplittingBackingMap that will delegate each
* partition's data and operations to a separate backing map.
*
* @param bmm a callback that knows how to create and release the
* backing maps that this PartitionSplittingBackingMap is
* responsible for
* @param sName the cache name for which this backing map exists
*/
public ObservableSplittingBackingMap(BackingMapManager bmm, String sName)
{
this(new PartitionSplittingBackingMap(bmm, sName));
}
/**
* Create a ObservableSplittingBackingMap that will delegate each
* partition's data and operations to a separate backing map.
*
* @param map the PartitionAwareBackingMap to delegate to
*/
public ObservableSplittingBackingMap(PartitionAwareBackingMap map)
{
super(map);
}
// ----- CacheMap interface ---------------------------------------------
/**
* {@inheritDoc}
*/
public Object put(Object oKey, Object oValue, long cMillis)
{
Object oOrig;
Map mapPart = getPartitionSplittingBackingMap().getBackingMap(oKey);
if (mapPart instanceof CacheMap)
{
// for an understanding of this event-related code, see
// WrapperObservableMap#put
boolean fFabricate = isEventFabricator();
int nEvent = fFabricate && mapPart.containsKey(oKey)
? MapEvent.ENTRY_UPDATED
: MapEvent.ENTRY_INSERTED;
prepareUpdate(mapPart, Collections.singletonMap(oKey, oValue));
oOrig = ((CacheMap) mapPart).put(oKey, oValue, cMillis);
if (fFabricate)
{
dispatchEvent(new CacheEvent(this, nEvent, oKey, oOrig, oValue, false));
}
}
else if (cMillis <= 0)
{
oOrig = super.put(oKey, oValue);
}
else
{
throw new UnsupportedOperationException();
}
return oOrig;
}
// ----- ObservableMap interface ----------------------------------------
/**
* {@inheritDoc}
*/
public synchronized void addMapListener(MapListener listener, Object oKey, boolean fLite)
{
azzert(listener != null);
MapListenerSupport support = ensureMapListenerSupport();
boolean fWasEmpty = support.isEmpty(oKey);
boolean fWasLite = !fWasEmpty && !support.containsStandardListeners(oKey);
support.addListener(listener, oKey, fLite);
if (m_nEventSource == EVT_SRC_BACKING && (fWasEmpty || (fWasLite && !fLite)))
{
PartitionSplittingBackingMap mapPSBM = getPartitionSplittingBackingMap();
BackingMapManagerContext ctx = mapPSBM.getContext();
ObservableMap mapSource = (ObservableMap)
getPartitionMap(ctx.getKeyPartition(oKey));
if (mapSource != null)
{
if (fWasLite && !fLite)
{
mapSource.removeMapListener(ensureInternalListener(), oKey);
}
mapSource.addMapListener(ensureInternalListener(), oKey, fLite);
}
}
}
/**
* {@inheritDoc}
*/
public synchronized void removeMapListener(MapListener listener, Object oKey)
{
MapListenerSupport support = getMapListenerSupport();
if (support != null)
{
boolean fWasStandard = support.containsStandardListeners(oKey);
support.removeListener(listener, oKey);
if (m_nEventSource == EVT_SRC_BACKING)
{
PartitionSplittingBackingMap mapPSBM = getPartitionSplittingBackingMap();
BackingMapManagerContext ctx = mapPSBM.getContext();
ObservableMap mapSource = (ObservableMap)
getPartitionMap(ctx.getKeyPartition(oKey));
if (mapSource != null)
{
MapListener listenerInternal = ensureInternalListener();
if (support.isEmpty(oKey))
{
mapSource.removeMapListener(listenerInternal, oKey);
if (support.isEmpty())
{
m_listenerSupport = null;
}
}
else
{
if (fWasStandard && !support.containsStandardListeners(oKey))
{
// replace standard with lite
mapSource.removeMapListener(listenerInternal, oKey);
mapSource.addMapListener(listenerInternal, oKey, true);
}
}
}
}
}
}
/**
* {@inheritDoc}
*/
public synchronized void addMapListener(MapListener listener, Filter filter, boolean fLite)
{
azzert(listener != null);
MapListenerSupport support = ensureMapListenerSupport();
boolean fWasEmpty = support.isEmpty(filter);
boolean fWasLite = !fWasEmpty && !support.containsStandardListeners(filter);
support.addListener(listener, filter, fLite);
if (m_nEventSource == EVT_SRC_BACKING && (fWasEmpty || (fWasLite && !fLite)))
{
MapListener listenerInternal = ensureInternalListener();
Map[] amapSource = getPartitionSplittingBackingMap().getMapArray().getBackingMaps();
for (int i = 0, c = amapSource.length; i < c; ++i)
{
ObservableMap mapSource = (ObservableMap) amapSource[i];
if (fWasLite && !fLite)
{
mapSource.removeMapListener(listenerInternal, filter);
}
mapSource.addMapListener(listenerInternal, filter, fLite);
}
}
}
/**
* {@inheritDoc}
*/
public synchronized void removeMapListener(MapListener listener, Filter filter)
{
MapListenerSupport support = getMapListenerSupport();
if (support != null)
{
boolean fWasStandard = support.containsStandardListeners(filter);
support.removeListener(listener, filter);
if (m_nEventSource == EVT_SRC_BACKING)
{
// determine what changes must occur to the event sources
// (the actual backing maps)
boolean fRemove = false;
boolean fAddLite = false;
if (support.isEmpty(filter))
{
fRemove = true;
if (support.isEmpty())
{
m_listenerSupport = null;
}
}
else
{
if (fWasStandard && !support.containsStandardListeners(filter))
{
// replace standard with lite
fRemove = true;
fAddLite = true;
}
}
if (fRemove || fAddLite)
{
MapListener listenerInternal = ensureInternalListener();
Map[] amapSource = getPartitionSplittingBackingMap().getMapArray().getBackingMaps();
for (int i = 0, c = amapSource.length; i < c; ++i)
{
ObservableMap mapSource = (ObservableMap) amapSource[i];
if (fRemove)
{
mapSource.removeMapListener(listenerInternal, filter);
}
if (fAddLite)
{
mapSource.addMapListener(listenerInternal, filter, true);
}
}
}
}
}
}
// ----- PartitionAwareBackingMap methods -------------------------------
/**
* {@inheritDoc}
*/
public BackingMapManager getBackingMapManager()
{
return getPartitionSplittingBackingMap().getBackingMapManager();
}
/**
* {@inheritDoc}
*/
public String getName()
{
return getPartitionSplittingBackingMap().getName();
}
/**
* {@inheritDoc}
*/
public void createPartition(int nPid)
{
// get the partition-aware backing map
PartitionSplittingBackingMap mapPSBM = getPartitionSplittingBackingMap();
// tell it to create the partition (which in turn creates the backing
// map)
mapPSBM.createPartition(nPid);
// get the new partition backing map
Map mapBacking = mapPSBM.getPartitionMap(nPid);
boolean fObservable = mapBacking instanceof ObservableMap;
int nEventSource = m_nEventSource;
if (nEventSource == EVT_SRC_UNKNOWN)
{
m_nEventSource = nEventSource = fObservable ? EVT_SRC_BACKING : EVT_SRC_THIS;
}
else
{
// all partition backing maps should be of the same type
azzert(nEventSource == (fObservable ? EVT_SRC_BACKING : EVT_SRC_THIS));
}
// if the new underlying partition map is responsible for raising
// events, then add any listeners that have already been registered
// for those events
synchronized (this)
{
if (nEventSource == EVT_SRC_BACKING && hasListeners())
{
ObservableMap mapSource = (ObservableMap) mapBacking;
MapListenerSupport support = getMapListenerSupport();
MapListener listener = ensureInternalListener();
for (Iterator iter = support.getFilterSet().iterator(); iter.hasNext(); )
{
Filter filter = (Filter) iter.next();
mapSource.addMapListener(listener, filter,
!support.containsStandardListeners(filter));
}
BackingMapManagerContext ctx = mapPSBM.getContext();
for (Iterator iter = support.getKeySet().iterator(); iter.hasNext(); )
{
Object oKey = iter.next();
if (ctx.getKeyPartition(oKey) == nPid)
{
mapSource.addMapListener(listener, oKey,
!support.containsStandardListeners(oKey));
}
}
}
}
}
/**
* {@inheritDoc}
*/
public void destroyPartition(int nPid)
{
// get the partition-aware backing map
PartitionSplittingBackingMap mapPSBM = getPartitionSplittingBackingMap();
// if the new underlying partition map is responsible for raising
// events, then unregister for those events
synchronized (this)
{
if (m_nEventSource == EVT_SRC_BACKING && hasListeners())
{
ObservableMap mapSource = (ObservableMap) mapPSBM.getPartitionMap(nPid);
MapListenerSupport support = getMapListenerSupport();
MapListener listener = ensureInternalListener();
for (Iterator iter = support.getFilterSet().iterator(); iter.hasNext(); )
{
Filter filter = (Filter) iter.next();
mapSource.removeMapListener(listener, filter);
}
BackingMapManagerContext ctx = mapPSBM.getContext();
for (Iterator iter = support.getKeySet().iterator(); iter.hasNext(); )
{
Object oKey = iter.next();
if (ctx.getKeyPartition(oKey) == nPid)
{
mapSource.removeMapListener(listener, oKey);
}
}
}
}
mapPSBM.destroyPartition(nPid);
}
/**
* {@inheritDoc}
*/
public Map getPartitionMap(int nPid)
{
return ((PartitionAwareBackingMap) m_map).getPartitionMap(nPid);
}
/**
* {@inheritDoc}
*/
public Map getPartitionMap(PartitionSet partitions)
{
return ((PartitionAwareBackingMap) m_map).getPartitionMap(partitions);
}
// ----- Disposable interface -------------------------------------------
/**
* {@inheritDoc}
*/
@Override
public void dispose()
{
getPartitionSplittingBackingMap().dispose();
}
// ----- accessors ------------------------------------------------------
/**
* Obtain the underlying PartitionSplittingBackingMap.
*
* @return the underlying PartitionSplittingBackingMap
*/
public PartitionSplittingBackingMap getPartitionSplittingBackingMap()
{
return (PartitionSplittingBackingMap) getMap();
}
/**
* {@inheritDoc}
*/
protected boolean isEventFabricator()
{
return hasListeners() && m_nEventSource == EVT_SRC_THIS;
}
/**
* {@inheritDoc}
*/
public void setTranslateEvents(boolean fTranslate)
{
// this sub-class can deal with the event translation setting being
// modified on the fly because all events are routed through the
// internal listener (there is no event by-pass option)
m_fTranslateEvents = fTranslate;
}
/**
* {@inheritDoc}
*/
public CacheStatistics getCacheStatistics()
{
return getPartitionSplittingBackingMap().getCacheStatistics();
}
/**
* {@inheritDoc}
*/
public boolean isCollectStats()
{
// stats are collected by the PartitionSplittingBackingMap
return false;
}
// ----- Object methods -------------------------------------------------
/**
* Return a human-readable description for this ObservableSplittingBackingMap.
*
* @return a String description of the ObservableSplittingBackingMap
*/
public String toString()
{
return ClassHelper.getSimpleName(getClass()) +
'{' + getPartitionSplittingBackingMap() + '}';
}
// ----- helpers --------------------------------------------------------
/**
* Prepare mapPart, a map representing a partition, for the impending changes
* in which all of the mappings from mapUpdate will be copied to mapPart.
*
* @param mapPart the map to be mutated with the contents of mapUpdate
* @param mapUpdate the map of changes to be applied
*/
protected void prepareUpdate(Map mapPart, Map mapUpdate)
{
// this method should be overridden by any sub class that needs to
// interrogate or manipulate the map prior to an impending mutation
// to the map
}
// ----- constants ------------------------------------------------------
/**
* Event source: Not yet determined (no partition maps yet).
*/
private static final int EVT_SRC_UNKNOWN = 0;
/**
* Event source: Events are raised by the underlying partition backing
* maps.
*/
private static final int EVT_SRC_BACKING = 1;
/**
* Event source: Events are fabricated by this map.
*/
private static final int EVT_SRC_THIS = 2;
// ----- data members ---------------------------------------------------
/**
* The source of events; one of the EVT_SRC_* constants. This tracks
* whether events are created (fabricated) by this map or whether the
* underlying maps are observable.
*/
private int m_nEventSource = EVT_SRC_UNKNOWN;
}