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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.cache.client.internal;
import org.apache.logging.log4j.Logger;
import org.apache.geode.cache.CacheClosedException;
import org.apache.geode.cache.CacheLoaderException;
import org.apache.geode.cache.Operation;
import org.apache.geode.cache.client.AllConnectionsInUseException;
import org.apache.geode.cache.client.ServerConnectivityException;
import org.apache.geode.cache.client.ServerOperationException;
import org.apache.geode.distributed.internal.ServerLocation;
import org.apache.geode.distributed.internal.membership.InternalDistributedMember;
import org.apache.geode.internal.cache.EntryEventImpl;
import org.apache.geode.internal.cache.GemFireCacheImpl;
import org.apache.geode.internal.cache.LocalRegion;
import org.apache.geode.internal.cache.Token;
import org.apache.geode.internal.cache.tier.MessageType;
import org.apache.geode.internal.cache.tier.sockets.Message;
import org.apache.geode.internal.cache.tier.sockets.Part;
import org.apache.geode.internal.cache.versions.VersionTag;
import org.apache.geode.internal.logging.LogService;
/**
* Does a region get on a server
*
* @since GemFire 5.7
*/
public class GetOp {
private static final Logger logger = LogService.getLogger();
public static final int HAS_CALLBACK_ARG = 0x01;
public static final int HAS_VERSION_TAG = 0x02;
public static final int KEY_NOT_PRESENT = 0x04;
public static final int VALUE_IS_INVALID = 0x08; // Token.INVALID
/**
* Does a region get on a server using connections from the given pool to communicate with the
* server.
*
* @param pool the pool to use to communicate with the server.
* @param region the region to do the get on
* @param key the entry key to do the get on
* @param callbackArg an optional callback arg to pass to any cache callbacks
* @param clientEvent holder for returning version information
* @return the entry value found by the get if any
*/
public static Object execute(ExecutablePool pool, LocalRegion region, Object key,
Object callbackArg, boolean prSingleHopEnabled, EntryEventImpl clientEvent) {
ClientMetadataService cms = ((GemFireCacheImpl) region.getCache()).getClientMetadataService();
GetOpImpl op = new GetOpImpl(region, key, callbackArg, prSingleHopEnabled, clientEvent);
if (logger.isDebugEnabled()) {
logger.debug("GetOp invoked for key {}", key);
}
if (prSingleHopEnabled) {
ServerLocation server =
cms.getBucketServerLocation(region, Operation.GET, key, null, callbackArg);
if (server != null) {
try {
PoolImpl poolImpl = (PoolImpl) pool;
boolean onlyUseExistingCnx = ((poolImpl.getMaxConnections() != -1
&& poolImpl.getConnectionCount() >= poolImpl.getMaxConnections()) ? true : false);
op.setAllowDuplicateMetadataRefresh(!onlyUseExistingCnx);
return pool.executeOn(new ServerLocation(server.getHostName(), server.getPort()), op,
true, onlyUseExistingCnx);
} catch (AllConnectionsInUseException e) {
} catch (ServerConnectivityException e) {
if (e instanceof ServerOperationException) {
throw e; // fixed 44656
}
cms.removeBucketServerLocation(server);
} catch (CacheLoaderException e) {
if (e.getCause() instanceof ServerConnectivityException)
cms.removeBucketServerLocation(server);
}
}
}
return pool.execute(op);
}
private GetOp() {
// no instances allowed
}
static class GetOpImpl extends AbstractOp {
private LocalRegion region = null;
private boolean prSingleHopEnabled = false;
private Object key;
private Object callbackArg;
private EntryEventImpl clientEvent;
public String toString() {
return "GetOpImpl(key=" + key + ")";
}
/**
* @throws org.apache.geode.SerializationException if serialization fails
*/
public GetOpImpl(LocalRegion region, Object key, Object callbackArg, boolean prSingleHopEnabled,
EntryEventImpl clientEvent) {
super(MessageType.REQUEST, callbackArg != null ? 3 : 2);
if (logger.isDebugEnabled()) {
logger.debug("constructing a GetOp for key {}", key/* , new Exception("stack trace") */);
}
this.region = region;
this.prSingleHopEnabled = prSingleHopEnabled;
this.key = key;
this.callbackArg = callbackArg;
this.clientEvent = clientEvent;
getMessage().addStringPart(region.getFullPath());
getMessage().addStringOrObjPart(key);
if (callbackArg != null) {
getMessage().addObjPart(callbackArg);
}
}
@Override
protected Object processResponse(Message msg) throws Exception {
throw new UnsupportedOperationException(); // version tag processing requires the connection
}
@Override
protected Object processResponse(Message msg, Connection con) throws Exception {
Object object = processObjResponse(msg, "get");
if (msg.getNumberOfParts() > 1) {
int partIdx = 1;
int flags = msg.getPart(partIdx++).getInt();
if ((flags & HAS_CALLBACK_ARG) != 0) {
msg.getPart(partIdx++).getObject(); // callbackArg
}
// if there's a version tag
if ((object == null) && ((flags & VALUE_IS_INVALID) != 0)) {
object = Token.INVALID;
}
if ((flags & HAS_VERSION_TAG) != 0) {
VersionTag tag = (VersionTag) msg.getPart(partIdx++).getObject();
assert con != null; // for debugging
assert con.getEndpoint() != null; // for debugging
assert tag != null; // for debugging
tag.replaceNullIDs((InternalDistributedMember) con.getEndpoint().getMemberId());
if (this.clientEvent != null) {
this.clientEvent.setVersionTag(tag);
}
if ((flags & KEY_NOT_PRESENT) != 0) {
object = Token.TOMBSTONE;
}
}
if (prSingleHopEnabled && msg.getNumberOfParts() > partIdx) {
byte version = 0;
int noOfMsgParts = msg.getNumberOfParts();
if (noOfMsgParts == partIdx + 1) {
Part part = msg.getPart(partIdx++);
if (part.isBytes()) {
byte[] bytesReceived = part.getSerializedForm();
if (bytesReceived[0] != ClientMetadataService.INITIAL_VERSION
&& bytesReceived.length == ClientMetadataService.SIZE_BYTES_ARRAY_RECEIVED) {
try {
ClientMetadataService cms = region.getCache().getClientMetadataService();
int myVersion =
cms.getMetaDataVersion(region, Operation.UPDATE, key, null, callbackArg);
if (myVersion != bytesReceived[0] || isAllowDuplicateMetadataRefresh()) {
cms.scheduleGetPRMetaData(region, false, bytesReceived[1]);
}
} catch (CacheClosedException e) {
return null;
}
}
}
} else if (noOfMsgParts == partIdx + 2) {
msg.getPart(partIdx++).getObject(); // callbackArg
Part part = msg.getPart(partIdx++);
if (part.isBytes()) {
byte[] bytesReceived = part.getSerializedForm();
if (this.region != null
&& bytesReceived.length == ClientMetadataService.SIZE_BYTES_ARRAY_RECEIVED) {
ClientMetadataService cms;
try {
cms = region.getCache().getClientMetadataService();
version =
cms.getMetaDataVersion(region, Operation.UPDATE, key, null, callbackArg);
} catch (CacheClosedException e) {
return null;
}
if (bytesReceived[0] != version) {
cms.scheduleGetPRMetaData(region, false, bytesReceived[1]);
}
}
}
}
}
}
return object;
}
@Override
protected boolean isErrorResponse(int msgType) {
return msgType == MessageType.REQUESTDATAERROR;
}
@Override
protected long startAttempt(ConnectionStats stats) {
return stats.startGet();
}
@Override
protected void endSendAttempt(ConnectionStats stats, long start) {
stats.endGetSend(start, hasFailed());
}
@Override
protected void endAttempt(ConnectionStats stats, long start) {
stats.endGet(start, hasTimedOut(), hasFailed());
}
}
}