org.apache.flink.runtime.jobmaster.failover.OperationLogManager Maven / Gradle / Ivy
/*
* 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.flink.runtime.jobmaster.failover;
import org.apache.flink.util.FlinkRuntimeException;
import java.util.HashMap;
import java.util.Map;
import static org.apache.flink.util.Preconditions.checkNotNull;
/**
* The manager for managing the recording and replaying of the {@link OperationLog}.
*/
public class OperationLogManager {
private final OperationLogStore operationLogStore;
private final Map opLogTypeToReplayHandlers;
private volatile boolean replaying = false;
public OperationLogManager(OperationLogStore store) {
this.operationLogStore = checkNotNull(store);
opLogTypeToReplayHandlers = new HashMap<>(1);
}
/**
* Start the operation log manager.
*/
public void start() {
operationLogStore.start();
}
/**
* Stop the operation log manager.
*/
public void stop() {
operationLogStore.stop();
}
/**
* Clear all the logs in store.
*/
public void clear() {
operationLogStore.clear();
replaying = false;
}
/**
* Weather is replaying log.
*/
public boolean isReplaying() {
return replaying;
}
/**
* Register the handler for the operation log type.
*
* @param type The log type
* @param logHandler The handler for the specified log type when replaying.
*/
public void registerLogHandler(OperationLogType type, Replayable logHandler) {
opLogTypeToReplayHandlers.put(type, logHandler);
}
/**
* Write an operation log.
*
* @param opLog The operation log need to be record
*/
public void writeOpLog(OperationLog opLog){
operationLogStore.writeOpLog(opLog);
}
/**
* Replay the operation logs that have been record.
*/
public void replay() {
replaying = true;
OperationLog opLog;
while ((opLog = operationLogStore.readOpLog()) != null) {
Replayable replayHandler = opLogTypeToReplayHandlers.get(opLog.getType());
if (replayHandler != null) {
replayHandler.replayOpLog(opLog);
} else {
throw new FlinkRuntimeException("Can not find replayer for log type " + opLog.getType());
}
}
replaying = false;
}
}