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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.Collection;
import java.util.Set;
import org.apache.logging.log4j.Logger;
import org.apache.geode.CancelException;
import org.apache.geode.DataSerializer;
import org.apache.geode.distributed.internal.DM;
import org.apache.geode.distributed.internal.DistributionManager;
import org.apache.geode.distributed.internal.DistributionMessage;
import org.apache.geode.distributed.internal.HighPriorityDistributionMessage;
import org.apache.geode.distributed.internal.MessageWithReply;
import org.apache.geode.distributed.internal.ReplyMessage;
import org.apache.geode.distributed.internal.ReplyProcessor21;
import org.apache.geode.internal.InternalDataSerializer;
import org.apache.geode.internal.cache.versions.VersionTag;
import org.apache.geode.internal.logging.LogService;
/**
*
*/
public class FindVersionTagOperation {
private static final Logger logger = LogService.getLogger();
public static VersionTag findVersionTag(LocalRegion r, EventID eventId, boolean isBulkOp) {
DM dm = r.getDistributionManager();
Set recipients;
if (r instanceof DistributedRegion) {
recipients = ((DistributedRegion) r).getDistributionAdvisor().adviseCacheOp();
} else {
recipients = ((PartitionedRegion) r).getRegionAdvisor().adviseDataStore();
}
ResultReplyProcessor processor = new ResultReplyProcessor(dm, recipients);
FindVersionTagMessage msg = new FindVersionTagMessage(recipients, processor.getProcessorId(),
r.getFullPath(), eventId, isBulkOp);
dm.putOutgoing(msg);
try {
processor.waitForReplies();
} catch (InterruptedException e) {
dm.getCancelCriterion().checkCancelInProgress(e);
Thread.currentThread().interrupt();
return null;
}
return processor.getVersionTag();
}
public static class ResultReplyProcessor extends ReplyProcessor21 {
VersionTag versionTag;
public ResultReplyProcessor(DM dm, Collection initMembers) {
super(dm, initMembers);
}
@Override
public void process(DistributionMessage msg) {
if (msg instanceof VersionTagReply) {
VersionTagReply reply = (VersionTagReply) msg;
if (reply.versionTag != null) {
this.versionTag = reply.versionTag;
this.versionTag.replaceNullIDs(reply.getSender());
}
}
super.process(msg);
}
public VersionTag getVersionTag() {
return versionTag;
}
@Override
public boolean stillWaiting() {
return this.versionTag == null && super.stillWaiting();
}
}
/**
* FindVersionTagOperation searches other members for version information for a replayed
* operation. If we don't have version information the op may be applied by this cache as a new
* event. When the event is then propagated to other servers that have already seen the event it
* will be ignored, causing an inconsistency.
*/
public static class FindVersionTagMessage extends HighPriorityDistributionMessage
implements MessageWithReply {
int processorId;
String regionName;
EventID eventId;
private boolean isBulkOp;
protected FindVersionTagMessage(Collection recipients, int processorId, String regionName,
EventID eventId, boolean isBulkOp) {
super();
setRecipients(recipients);
this.processorId = processorId;
this.regionName = regionName;
this.eventId = eventId;
this.isBulkOp = isBulkOp;
}
/** for deserialization */
public FindVersionTagMessage() {}
/*
* (non-Javadoc)
*
* @see org.apache.geode.distributed.internal.DistributionMessage#process(org.apache.geode.
* distributed.internal.DistributionManager)
*/
@Override
protected void process(DistributionManager dm) {
VersionTag result = null;
try {
LocalRegion r = findRegion();
if (r == null) {
if (logger.isDebugEnabled()) {
logger.debug("Region not found, so ignoring version tag request: {}", this);
}
return;
}
if (isBulkOp) {
result = r.findVersionTagForClientBulkOp(eventId);
} else {
result = r.findVersionTagForClientEvent(eventId);
}
if (result != null) {
result.replaceNullIDs(r.getVersionMember());
}
if (logger.isDebugEnabled()) {
logger.debug("Found version tag {}", result);
}
} catch (RuntimeException e) {
logger.warn("Exception thrown while searching for a version tag", e);
} finally {
VersionTagReply reply = new VersionTagReply(result);
reply.setProcessorId(this.processorId);
reply.setRecipient(getSender());
try {
dm.putOutgoing(reply);
} catch (CancelException e) {
// can't send a reply, so ignore the exception
}
}
}
private LocalRegion findRegion() {
GemFireCacheImpl cache = null;
try {
cache = GemFireCacheImpl.getInstance();
if (cache != null) {
return cache.getRegionByPathForProcessing(regionName);
}
} catch (CancelException e) {
// nothing to do
}
return null;
}
public int getDSFID() {
return FIND_VERSION_TAG;
}
@Override
public void toData(DataOutput out) throws IOException {
super.toData(out);
out.writeInt(this.processorId);
out.writeUTF(this.regionName);
InternalDataSerializer.invokeToData(this.eventId, out);
out.writeBoolean(this.isBulkOp);
}
@Override
public void fromData(DataInput in) throws IOException, ClassNotFoundException {
super.fromData(in);
this.processorId = in.readInt();
this.regionName = in.readUTF();
this.eventId = new EventID();
InternalDataSerializer.invokeFromData(this.eventId, in);
this.isBulkOp = in.readBoolean();
}
@Override
public String toString() {
return this.getShortClassName() + "(processorId=" + this.processorId + ";region="
+ this.regionName + ";eventId=" + this.eventId + ";isBulkOp=" + this.isBulkOp + ")";
}
}
public static class VersionTagReply extends ReplyMessage {
VersionTag versionTag;
VersionTagReply(VersionTag result) {
this.versionTag = result;
}
/** for deserialization */
public VersionTagReply() {}
@Override
public String toString() {
return "VersionTagReply(" + this.versionTag + ")";
}
@Override
public void toData(DataOutput out) throws IOException {
super.toData(out);
DataSerializer.writeObject(this.versionTag, out);
}
@Override
public void fromData(DataInput in) throws IOException, ClassNotFoundException {
super.fromData(in);
this.versionTag = (VersionTag) DataSerializer.readObject(in);
}
@Override
public int getDSFID() {
return VERSION_TAG_REPLY;
}
}
}