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BDBStateChangeListener.java
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BDBStateChangeListener.java
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// This file is made available under Elastic License 2.0.
// This file is based on code available under the Apache license here:
// https://github.com/apache/incubator-doris/blob/master/fe/fe-core/src/main/java/org/apache/doris/ha/BDBStateChangeListener.java
// 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 com.starrocks.ha;
import com.google.common.base.Preconditions;
import com.sleepycat.je.rep.StateChangeEvent;
import com.sleepycat.je.rep.StateChangeListener;
import com.starrocks.common.util.Util;
import com.starrocks.persist.EditLog;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
public class BDBStateChangeListener implements StateChangeListener {
public static final Logger LOG = LogManager.getLogger(EditLog.class);
private FrontendNodeType newType = FrontendNodeType.UNKNOWN;
private final boolean isElectable;
public BDBStateChangeListener(boolean isElectable) {
this.isElectable = isElectable;
}
public synchronized FrontendNodeType getNewType() {
return newType;
}
@Override
public synchronized void stateChange(StateChangeEvent sce) throws RuntimeException {
switch (sce.getState()) {
case MASTER: {
newType = FrontendNodeType.LEADER;
break;
}
case REPLICA: {
if (isElectable) {
newType = FrontendNodeType.FOLLOWER;
} else {
newType = FrontendNodeType.OBSERVER;
}
break;
}
case UNKNOWN: {
newType = FrontendNodeType.UNKNOWN;
break;
}
default: {
String msg = "this node is " + sce.getState().name();
LOG.warn(msg);
Util.stdoutWithTime(msg);
return;
}
}
Preconditions.checkNotNull(newType);
StateChangeExecutor.getInstance().notifyNewFETypeTransfer(newType);
}
}