/**
* 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.zookeeper.server.quorum;
import java.io.IOException;
import org.apache.zookeeper.KeeperException;
import org.apache.zookeeper.ZooDefs.OpCode;
import org.apache.zookeeper.server.Request;
import org.apache.zookeeper.server.RequestProcessor;
import org.apache.zookeeper.txn.ErrorTxn;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Responsible for performing local session upgrade. Only request submitted
* directly to the leader should go through this processor.
*/
public class LeaderRequestProcessor implements RequestProcessor {
private static final Logger LOG = LoggerFactory
.getLogger(LeaderRequestProcessor.class);
private final LeaderZooKeeperServer lzks;
private final RequestProcessor nextProcessor;
public LeaderRequestProcessor(LeaderZooKeeperServer zks,
RequestProcessor nextProcessor) {
this.lzks = zks;
this.nextProcessor = nextProcessor;
}
@Override
public void processRequest(Request request)
throws RequestProcessorException {
// Check if this is a local session and we are trying to create
// an ephemeral node, in which case we upgrade the session
Request upgradeRequest = null;
try {
upgradeRequest = lzks.checkUpgradeSession(request);
} catch (KeeperException ke) {
if (request.getHdr() != null) {
LOG.debug("Updating header");
request.getHdr().setType(OpCode.error);
request.setTxn(new ErrorTxn(ke.code().intValue()));
}
request.setException(ke);
LOG.info("Error creating upgrade request " + ke.getMessage());
} catch (IOException ie) {
LOG.error("Unexpected error in upgrade", ie);
}
if (upgradeRequest != null) {
nextProcessor.processRequest(upgradeRequest);
}
nextProcessor.processRequest(request);
}
@Override
public void shutdown() {
LOG.info("Shutting down");
nextProcessor.shutdown();
}
}