package org.apache.jcs.auxiliary.remote; | |
/* | |
* Licensed to the Apache Software Foundation (ASF) under one | |
* or more contributor license agreements. See the NOTICE file | |
* distributed with this work for additional information | |
* regarding copyright ownership. The ASF licenses this file | |
* to you 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. | |
*/ | |
import java.io.IOException; | |
import java.io.Serializable; | |
import java.util.ArrayList; | |
import java.util.Arrays; | |
import java.util.Collections; | |
import java.util.HashMap; | |
import java.util.HashSet; | |
import java.util.List; | |
import java.util.Map; | |
import java.util.Set; | |
import org.apache.commons.logging.Log; | |
import org.apache.commons.logging.LogFactory; | |
import org.apache.jcs.auxiliary.AbstractAuxiliaryCache; | |
import org.apache.jcs.auxiliary.AuxiliaryCache; | |
import org.apache.jcs.auxiliary.AuxiliaryCacheAttributes; | |
import org.apache.jcs.auxiliary.remote.behavior.IRemoteCacheAttributes; | |
import org.apache.jcs.engine.CacheConstants; | |
import org.apache.jcs.engine.behavior.ICacheElement; | |
import org.apache.jcs.engine.behavior.ICacheType; | |
import org.apache.jcs.engine.behavior.ICompositeCacheManager; | |
import org.apache.jcs.engine.behavior.IElementSerializer; | |
import org.apache.jcs.engine.logging.behavior.ICacheEventLogger; | |
import org.apache.jcs.engine.stats.StatElement; | |
import org.apache.jcs.engine.stats.Stats; | |
import org.apache.jcs.engine.stats.behavior.IStatElement; | |
import org.apache.jcs.engine.stats.behavior.IStats; | |
/** An abstract base for the No Wait Facade. Different implmentations will failover differently. */ | |
public abstract class AbstractRemoteCacheNoWaitFacade | |
extends AbstractAuxiliaryCache | |
{ | |
/** For serialization. Don't change. */ | |
private static final long serialVersionUID = -4529970797620747110L; | |
/** log instance */ | |
private final static Log log = LogFactory.getLog( AbstractRemoteCacheNoWaitFacade.class ); | |
/** The connection to a remote server, or a zombie. */ | |
public RemoteCacheNoWait[] noWaits; | |
/** The cache name */ | |
private String cacheName; | |
/** holds failover and cluster information */ | |
protected IRemoteCacheAttributes remoteCacheAttributes; | |
/** A cache manager */ | |
private ICompositeCacheManager compositeCacheManager; | |
/** | |
* Constructs with the given remote cache, and fires events to any listeners. | |
* <p> | |
* @param noWaits | |
* @param rca | |
* @param cacheMgr | |
* @param cacheEventLogger | |
* @param elementSerializer | |
*/ | |
public AbstractRemoteCacheNoWaitFacade( RemoteCacheNoWait[] noWaits, RemoteCacheAttributes rca, | |
ICompositeCacheManager cacheMgr, ICacheEventLogger cacheEventLogger, | |
IElementSerializer elementSerializer ) | |
{ | |
if ( log.isDebugEnabled() ) | |
{ | |
log.debug( "CONSTRUCTING NO WAIT FACADE" ); | |
} | |
this.noWaits = noWaits; | |
this.remoteCacheAttributes = rca; | |
this.cacheName = rca.getCacheName(); | |
setCompositeCacheManager( cacheMgr ); | |
this.cacheEventLogger = cacheEventLogger; | |
this.elementSerializer = elementSerializer; | |
} | |
/** | |
* Put an element in the cache. | |
* <p> | |
* @param ce | |
* @throws IOException | |
*/ | |
public void update( ICacheElement ce ) | |
throws IOException | |
{ | |
if ( log.isDebugEnabled() ) | |
{ | |
log.debug( "updating through cache facade, noWaits.length = " + noWaits.length ); | |
} | |
int i = 0; | |
try | |
{ | |
for ( ; i < noWaits.length; i++ ) | |
{ | |
noWaits[i].update( ce ); | |
// an initial move into a zombie will lock this to primary | |
// recovery. will not discover other servers until primary | |
// reconnect | |
// and subsequent error | |
} | |
} | |
catch ( Exception ex ) | |
{ | |
String message = "Problem updating no wait. Will initiate failover if the noWait is in error."; | |
log.error( message, ex ); | |
if ( getCacheEventLogger() != null ) | |
{ | |
getCacheEventLogger().logError( | |
"RemoteCacheNoWaitFacade", | |
ICacheEventLogger.UPDATE_EVENT, | |
message + ":" + ex.getMessage() + " REGION: " + ce.getCacheName() | |
+ " ELEMENT: " + ce ); | |
} | |
// can handle failover here? Is it safe to try the others? | |
// check to see it the noWait is now a zombie | |
// if it is a zombie, then move to the next in the failover list | |
// will need to keep them in order or a count | |
failover( i ); | |
// should start a failover thread | |
// should probably only failover if there is only one in the noWait | |
// list | |
// Should start a background thread to restore the original primary if we are in failover state. | |
} | |
} | |
/** | |
* Synchronously reads from the remote cache. | |
* <p> | |
* @param key | |
* @return Either an ICacheElement or null if it is not found. | |
*/ | |
public ICacheElement get( Serializable key ) | |
{ | |
for ( int i = 0; i < noWaits.length; i++ ) | |
{ | |
try | |
{ | |
Object obj = noWaits[i].get( key ); | |
if ( obj != null ) | |
{ | |
return (ICacheElement) obj; | |
} | |
} | |
catch ( Exception ex ) | |
{ | |
log.debug( "Failed to get." ); | |
return null; | |
} | |
} | |
return null; | |
} | |
/** | |
* Synchronously read from the remote cache. | |
* <p> | |
* @param pattern | |
* @return map | |
* @throws IOException | |
*/ | |
public Map getMatching( String pattern ) | |
throws IOException | |
{ | |
for ( int i = 0; i < noWaits.length; i++ ) | |
{ | |
try | |
{ | |
return noWaits[i].getMatching( pattern ); | |
} | |
catch ( Exception ex ) | |
{ | |
log.debug( "Failed to getMatching." ); | |
return Collections.EMPTY_MAP; | |
} | |
} | |
return Collections.EMPTY_MAP; | |
} | |
/** | |
* Gets multiple items from the cache based on the given set of keys. | |
* <p> | |
* @param keys | |
* @return a map of Serializable key to ICacheElement element, or an empty map if there is no | |
* data in cache for any of these keys | |
*/ | |
public Map getMultiple( Set keys ) | |
{ | |
if ( keys != null && !keys.isEmpty() ) | |
{ | |
for ( int i = 0; i < noWaits.length; i++ ) | |
{ | |
try | |
{ | |
return noWaits[i].getMultiple( keys ); | |
} | |
catch ( Exception ex ) | |
{ | |
log.debug( "Failed to get." ); | |
return Collections.EMPTY_MAP; | |
} | |
} | |
} | |
return new HashMap(); | |
} | |
/** | |
* Gets the set of keys of objects currently in the group. | |
* <p> | |
* @param group | |
* @return the set of keys of objects currently in the group | |
* @throws IOException | |
*/ | |
public Set getGroupKeys( String group ) | |
throws IOException | |
{ | |
HashSet allKeys = new HashSet(); | |
for ( int i = 0; i < noWaits.length; i++ ) | |
{ | |
AuxiliaryCache aux = noWaits[i]; | |
if ( aux != null ) | |
{ | |
allKeys.addAll( aux.getGroupKeys( group ) ); | |
} | |
} | |
return allKeys; | |
} | |
/** | |
* Adds a remove request to the remote cache. | |
* <p> | |
* @param key | |
* @return whether or not it was removed, right now it return false. | |
*/ | |
public boolean remove( Serializable key ) | |
{ | |
try | |
{ | |
for ( int i = 0; i < noWaits.length; i++ ) | |
{ | |
noWaits[i].remove( key ); | |
} | |
} | |
catch ( Exception ex ) | |
{ | |
log.error( ex ); | |
} | |
return false; | |
} | |
/** | |
* Adds a removeAll request to the remote cache. | |
*/ | |
public void removeAll() | |
{ | |
try | |
{ | |
for ( int i = 0; i < noWaits.length; i++ ) | |
{ | |
noWaits[i].removeAll(); | |
} | |
} | |
catch ( Exception ex ) | |
{ | |
log.error( ex ); | |
} | |
} | |
/** Adds a dispose request to the remote cache. */ | |
public void dispose() | |
{ | |
try | |
{ | |
for ( int i = 0; i < noWaits.length; i++ ) | |
{ | |
noWaits[i].dispose(); | |
} | |
} | |
catch ( Exception ex ) | |
{ | |
log.error( "Problem in dispose.", ex ); | |
} | |
} | |
/** | |
* No remote invocation. | |
* <p> | |
* @return The size value | |
*/ | |
public int getSize() | |
{ | |
return 0; | |
// cache.getSize(); | |
} | |
/** | |
* Gets the cacheType attribute of the RemoteCacheNoWaitFacade object. | |
* <p> | |
* @return The cacheType value | |
*/ | |
public int getCacheType() | |
{ | |
return ICacheType.REMOTE_CACHE; | |
} | |
/** | |
* Gets the cacheName attribute of the RemoteCacheNoWaitFacade object. | |
* <p> | |
* @return The cacheName value | |
*/ | |
public String getCacheName() | |
{ | |
return remoteCacheAttributes.getCacheName(); | |
} | |
/** | |
* Gets the status attribute of the RemoteCacheNoWaitFacade object | |
* <p> | |
* Return ALIVE if any are alive. | |
* <p> | |
* @return The status value | |
*/ | |
public int getStatus() | |
{ | |
for ( int i = 0; i < noWaits.length; i++ ) | |
{ | |
if ( noWaits[i].getStatus() == CacheConstants.STATUS_ALIVE ) | |
{ | |
return CacheConstants.STATUS_ALIVE; | |
} | |
} | |
return 0; | |
} | |
/** | |
* String form of some of the configuration information for the remote cache. | |
* <p> | |
* @return Some info for logging. | |
*/ | |
public String toString() | |
{ | |
return "RemoteCacheNoWaitFacade: " + cacheName + ", rca = " + remoteCacheAttributes; | |
} | |
/** | |
* Begin the failover process if this is a local cache. Clustered remote caches do not failover. | |
* <p> | |
* @param i The no wait in error. | |
*/ | |
abstract void failover( int i ); | |
/** | |
* @return Returns the AuxiliaryCacheAttributes. | |
*/ | |
public AuxiliaryCacheAttributes getAuxiliaryCacheAttributes() | |
{ | |
return this.remoteCacheAttributes; | |
} | |
/** | |
* getStats | |
* @return String | |
*/ | |
public String getStats() | |
{ | |
return getStatistics().toString(); | |
} | |
/** | |
* @return statistics about the cache region | |
*/ | |
public IStats getStatistics() | |
{ | |
IStats stats = new Stats(); | |
stats.setTypeName( "Remote Cache No Wait Facade" ); | |
ArrayList elems = new ArrayList(); | |
IStatElement se = null; | |
if ( noWaits != null ) | |
{ | |
se = new StatElement(); | |
se.setName( "Number of No Waits" ); | |
se.setData( "" + noWaits.length ); | |
elems.add( se ); | |
for ( int i = 0; i < noWaits.length; i++ ) | |
{ | |
// get the stats from the super too | |
// get as array, convert to list, add list to our outer list | |
IStats sStats = noWaits[i].getStatistics(); | |
IStatElement[] sSEs = sStats.getStatElements(); | |
List sL = Arrays.asList( sSEs ); | |
elems.addAll( sL ); | |
} | |
} | |
// get an array and put them in the Stats object | |
IStatElement[] ses = (IStatElement[]) elems.toArray( new StatElement[0] ); | |
stats.setStatElements( ses ); | |
return stats; | |
} | |
/** | |
* This typically returns end point info . | |
* <p> | |
* @return the name | |
*/ | |
public String getEventLoggingExtraInfo() | |
{ | |
return "Remote Cache No Wait Facade"; | |
} | |
/** | |
* Gets the remoteCacheAttributes attribute of the RemoteCacheNoWaitFacade object | |
* <p> | |
* @return The remoteCacheAttributes value | |
*/ | |
public IRemoteCacheAttributes getRemoteCacheAttributes() | |
{ | |
return remoteCacheAttributes; | |
} | |
/** | |
* Sets the remoteCacheAttributes attribute of the RemoteCacheNoWaitFacade object. | |
* <p> | |
* @param rca The new remoteCacheAttributes value | |
*/ | |
public void setRemoteCacheAttributes( IRemoteCacheAttributes rca ) | |
{ | |
this.remoteCacheAttributes = rca; | |
} | |
/** | |
* @param compositeCacheManager the compositeCacheManager to set | |
*/ | |
protected void setCompositeCacheManager( ICompositeCacheManager compositeCacheManager ) | |
{ | |
this.compositeCacheManager = compositeCacheManager; | |
} | |
/** | |
* @return the compositeCacheManager | |
*/ | |
protected ICompositeCacheManager getCompositeCacheManager() | |
{ | |
return compositeCacheManager; | |
} | |
} |