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Apache Geode provides a database-like consistency model, reliable transaction processing and a shared-nothing architecture to maintain very low latency performance with high concurrency processing
/*
* 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.
*/
package org.apache.geode.internal.cache;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import org.apache.geode.DataSerializer;
import org.apache.geode.cache.CacheEvent;
import org.apache.geode.cache.EntryNotFoundException;
import org.apache.geode.distributed.internal.DistributionManager;
import org.apache.geode.distributed.internal.membership.InternalDistributedMember;
import org.apache.geode.internal.InternalDataSerializer;
import org.apache.geode.internal.Version;
import org.apache.geode.internal.cache.tier.sockets.ClientProxyMembershipID;
import org.apache.geode.internal.cache.versions.RegionVersionVector;
import org.apache.geode.internal.cache.versions.VersionTag;
/**
*
*
*/
public class DistributedClearOperation extends DistributedCacheOperation {
public static enum OperationType {
OP_LOCK_FOR_CLEAR, OP_CLEAR,
}
private RegionVersionVector rvv;
private OperationType operation;
private Set recipients;
private VersionTag operationTag;
/**
* A map of all the regions that are currently locked for a clear in this VM
*/
private static final ConcurrentHashMap lockedRegions =
new ConcurrentHashMap();
public static void regionLocked(InternalDistributedMember locker, String regionPath,
DistributedRegion region) {
lockedRegions.put(new LockKey(locker, regionPath), region);
}
public static DistributedRegion regionUnlocked(InternalDistributedMember locker,
String regionPath) {
return lockedRegions.remove(new LockKey(locker, regionPath));
}
/**
* distribute a clear() to other members
**/
public static void clear(RegionEventImpl regionEvent, RegionVersionVector rvv,
Set recipients) {
new DistributedClearOperation(DistributedClearOperation.OperationType.OP_CLEAR, regionEvent,
rvv, recipients).distribute();
}
/**
* obtain locks on version generation in other members have them do a state-flush back to this
* member
*
* @param recipients
*/
public static void lockAndFlushToOthers(RegionEventImpl regionEvent,
Set recipients) {
DistributedClearOperation dco = new DistributedClearOperation(
DistributedClearOperation.OperationType.OP_LOCK_FOR_CLEAR, regionEvent, null, recipients);
dco.distribute();
}
@Override
public String toString() {
String cname = getClass().getName().substring(getClass().getPackage().getName().length() + 1);
return cname + "(op=" + this.operation + ", tag=" + this.operationTag + "event=" + this.event
+ ")";
}
/** release locks in other members obtained for an RVV clear */
public static void releaseLocks(RegionEventImpl regionEvent,
Set recipients) {
DistributedRegion region = (DistributedRegion) regionEvent.getRegion();
ReleaseClearLockMessage.send(recipients, region.getDistributionManager(), region.getFullPath());
}
// clear must receive responses when versioning is enabled
@Override
protected boolean shouldAck() {
return true;
}
@Override
public boolean containsRegionContentChange() {
return this.operation == OperationType.OP_CLEAR;
}
/**
* Creates new instance of DistributedClearOperation
*
* @param recipients
*/
private DistributedClearOperation(OperationType op, RegionEventImpl event,
RegionVersionVector rvv, Set recipients) {
super(event);
this.rvv = rvv;
this.operation = op;
this.recipients = recipients;
if (event != null) {
this.operationTag = event.getVersionTag();
}
}
@Override
protected void initProcessor(CacheOperationReplyProcessor p, CacheOperationMessage msg) {
super.initProcessor(p, msg);
}
@Override
protected boolean supportsAdjunctMessaging() {
return false;
}
@Override
public boolean supportsMulticast() {
return false;
}
@Override
protected CacheOperationMessage createMessage() {
ClearRegionMessage mssg;
if (this.event instanceof ClientRegionEventImpl) {
mssg = new ClearRegionWithContextMessage();
((ClearRegionWithContextMessage) mssg).context =
((ClientRegionEventImpl) this.event).getContext();
} else {
mssg = new ClearRegionMessage();
}
mssg.clearOp = this.operation;
mssg.eventID = this.event.getEventId();
mssg.rvv = this.rvv;
mssg.owner = this;
mssg.operationTag = this.operationTag;
return mssg;
}
@Override
protected Set getRecipients() {
return recipients;
}
public static class ClearRegionMessage extends CacheOperationMessage {
protected EventID eventID;
protected RegionVersionVector rvv;
protected OperationType clearOp;
protected VersionTag operationTag;
protected transient DistributedClearOperation owner;
@Override
public boolean containsRegionContentChange() {
return this.clearOp == OperationType.OP_CLEAR;
}
@Override
public int getProcessorType() {
/*
* since clear() can block for a while we don't want to run it in a reader thread. It is also
* okay to run this in a non-ordered executor since the operation contains its own ordering
* information.
*/
return DistributionManager.HIGH_PRIORITY_EXECUTOR;
}
@Override
protected InternalCacheEvent createEvent(DistributedRegion rgn) throws EntryNotFoundException {
RegionEventImpl event = createRegionEvent(rgn);
event.setEventID(this.eventID);
if (this.filterRouting != null) {
event.setLocalFilterInfo(this.filterRouting.getFilterInfo(rgn.getMyId()));
}
return event;
}
protected RegionEventImpl createRegionEvent(DistributedRegion rgn) {
RegionEventImpl event = new RegionEventImpl(rgn, getOperation(), this.callbackArg,
true /* originRemote */, getSender());
event.setVersionTag(this.operationTag);
return event;
}
@Override
protected boolean operateOnRegion(CacheEvent event, DistributionManager dm)
throws EntryNotFoundException {
DistributedRegion region = (DistributedRegion) event.getRegion();
switch (this.clearOp) {
case OP_CLEAR:
region.clearRegionLocally((RegionEventImpl) event, false, this.rvv);
region.notifyBridgeClients((RegionEventImpl) event);
this.appliedOperation = true;
break;
case OP_LOCK_FOR_CLEAR:
if (region.getDataPolicy().withStorage()) {
DistributedClearOperation.regionLocked(this.getSender(), region.getFullPath(), region);
region.lockLocallyForClear(dm, this.getSender(), event);
}
this.appliedOperation = true;
break;
}
return true;
}
public int getDSFID() {
return CLEAR_REGION_MESSAGE;
}
@Override
public void fromData(DataInput in) throws IOException, ClassNotFoundException {
super.fromData(in);
this.clearOp = OperationType.values()[in.readByte()];
this.eventID = (EventID) DataSerializer.readObject(in);
this.rvv = (RegionVersionVector) DataSerializer.readObject(in);
this.operationTag = (VersionTag) DataSerializer.readObject(in);
}
@Override
public void toData(DataOutput out) throws IOException {
super.toData(out);
out.writeByte(this.clearOp.ordinal());
DataSerializer.writeObject(this.eventID, out);
DataSerializer.writeObject(this.rvv, out);
DataSerializer.writeObject(this.operationTag, out);
}
@Override
protected void appendFields(StringBuilder buff) {
super.appendFields(buff);
buff.append("; op=").append(this.clearOp);
buff.append("; eventID=").append(this.eventID);
buff.append("; tag=").append(this.operationTag);
buff.append("; rvv=").append(this.rvv);
}
}
public static final class ClearRegionWithContextMessage extends ClearRegionMessage {
protected transient Object context;
protected RegionVersionVector rvv;
@Override
final public RegionEventImpl createRegionEvent(DistributedRegion rgn) {
ClientRegionEventImpl event = new ClientRegionEventImpl(rgn, getOperation(), this.callbackArg,
true /* originRemote */, getSender(), (ClientProxyMembershipID) this.context);
return event;
}
@Override
protected void appendFields(StringBuilder buff) {
super.appendFields(buff);
buff.append("; context=").append(this.context);
}
@Override
public int getDSFID() {
return CLEAR_REGION_MESSAGE_WITH_CONTEXT;
}
@Override
public void fromData(DataInput in) throws IOException, ClassNotFoundException {
super.fromData(in);
this.context = DataSerializer.readObject(in);
}
@Override
public void toData(DataOutput out) throws IOException {
super.toData(out);
DataSerializer.writeObject(this.context, out);
}
}
public static class LockKey {
private final InternalDistributedMember locker;
private final String regionPath;
public LockKey(InternalDistributedMember locker, String regionPath) {
this.locker = locker;
this.regionPath = regionPath;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((locker == null) ? 0 : locker.hashCode());
result = prime * result + ((regionPath == null) ? 0 : regionPath.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
LockKey other = (LockKey) obj;
if (locker == null) {
if (other.locker != null)
return false;
} else if (!locker.equals(other.locker))
return false;
if (regionPath == null) {
if (other.regionPath != null)
return false;
} else if (!regionPath.equals(other.regionPath))
return false;
return true;
}
}
}