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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.tier.sockets.command;
import java.io.IOException;
import org.apache.geode.LogWriter;
import org.apache.geode.internal.cache.CachedDeserializable;
import org.apache.geode.internal.cache.EventID;
import org.apache.geode.internal.cache.GemFireCacheImpl;
import org.apache.geode.internal.cache.ha.HAContainerWrapper;
import org.apache.geode.internal.cache.tier.CachedRegionHelper;
import org.apache.geode.internal.cache.tier.Command;
import org.apache.geode.internal.cache.tier.MessageType;
import org.apache.geode.internal.cache.tier.sockets.BaseCommand;
import org.apache.geode.internal.cache.tier.sockets.CacheClientNotifier;
import org.apache.geode.internal.cache.tier.sockets.CacheServerHelper;
import org.apache.geode.internal.cache.tier.sockets.ClientUpdateMessageImpl;
import org.apache.geode.internal.cache.tier.sockets.HAEventWrapper;
import org.apache.geode.internal.cache.tier.sockets.Message;
import org.apache.geode.internal.cache.tier.sockets.Part;
import org.apache.geode.internal.cache.tier.sockets.ServerConnection;
import org.apache.geode.internal.i18n.LocalizedStrings;
import org.apache.geode.internal.logging.log4j.LocalizedMessage;
/**
* Represents a request for (full) value of a given event from ha container
* (client-messages-region).
*
* @since GemFire 6.1
*/
public class RequestEventValue extends BaseCommand {
private final static RequestEventValue singleton = new RequestEventValue();
public static Command getCommand() {
return singleton;
}
private RequestEventValue() {}
public void cmdExecute(Message msg, ServerConnection servConn, long start) throws IOException {
Part eventIDPart = null, valuePart = null;
EventID event = null;
Object callbackArg = null;
CachedRegionHelper crHelper = servConn.getCachedRegionHelper();
StringBuffer errMessage = new StringBuffer();
servConn.setAsTrue(REQUIRES_RESPONSE);
// Retrieve the data from the message parts
int parts = msg.getNumberOfParts();
eventIDPart = msg.getPart(0);
if (eventIDPart == null) {
logger.warn(LocalizedMessage.create(
LocalizedStrings.RequestEventValue_0_THE_EVENT_ID_FOR_THE_GET_EVENT_VALUE_REQUEST_IS_NULL,
servConn.getName()));
errMessage.append(" The event id for the get event value request is null.");
writeErrorResponse(msg, MessageType.REQUESTDATAERROR, errMessage.toString(), servConn);
servConn.setAsTrue(RESPONDED);
} else {
try {
event = (EventID) eventIDPart.getObject();
} catch (Exception e) {
writeException(msg, e, false, servConn);
servConn.setAsTrue(RESPONDED);
return;
}
if (parts > 1) {
valuePart = msg.getPart(1);
try {
if (valuePart != null) {
callbackArg = valuePart.getObject();
}
} catch (Exception e) {
writeException(msg, e, false, servConn);
servConn.setAsTrue(RESPONDED);
return;
}
}
if (logger.isTraceEnabled()) {
logger.trace("{}: Received get event value request ({} bytes) from {}", servConn.getName(),
msg.getPayloadLength(), servConn.getSocketString());
}
CacheClientNotifier ccn = servConn.getAcceptor().getCacheClientNotifier();
// Get the ha container.
HAContainerWrapper haContainer = (HAContainerWrapper) ccn.getHaContainer();
if (haContainer == null) {
String reason = " was not found during get event value request";
writeRegionDestroyedEx(msg, "ha container", reason, servConn);
servConn.setAsTrue(RESPONDED);
} else {
Object[] valueAndIsObject = new Object[2];
try {
Object data = haContainer.get(new HAEventWrapper(event));
if (data == null) {
logger.warn(LocalizedMessage.create(
LocalizedStrings.RequestEventValue_UNABLE_TO_FIND_A_CLIENT_UPDATE_MESSAGE_FOR_0,
event));
String msgStr = "No value found for " + event + " in " + haContainer.getName();
writeErrorResponse(msg, MessageType.REQUEST_EVENT_VALUE_ERROR, msgStr, servConn);
servConn.setAsTrue(RESPONDED);
return;
} else {
if (logger.isDebugEnabled()) {
logger.debug("Value retrieved for event {}", event);
}
Object val = ((ClientUpdateMessageImpl) data).getValueToConflate();
if (!(val instanceof byte[])) {
if (val instanceof CachedDeserializable) {
val = ((CachedDeserializable) val).getSerializedValue();
} else {
val = CacheServerHelper.serialize(val);
}
((ClientUpdateMessageImpl) data).setLatestValue(val);
}
valueAndIsObject[0] = val;
valueAndIsObject[1] = Boolean.valueOf(((ClientUpdateMessageImpl) data).valueIsObject());
}
} catch (Exception e) {
writeException(msg, e, false, servConn);
servConn.setAsTrue(RESPONDED);
return;
}
Object data = valueAndIsObject[0];
boolean isObject = (Boolean) valueAndIsObject[1];
writeResponse(data, callbackArg, msg, isObject, servConn);
servConn.setAsTrue(RESPONDED);
ccn.getClientProxy(servConn.getProxyID()).getStatistics().incDeltaFullMessagesSent();
if (logger.isDebugEnabled()) {
logger.debug("{}: Wrote get event value response back to {} for ha container {}",
servConn.getName(), servConn.getSocketString(), haContainer.getName());
}
}
}
}
}