/**
 * 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.hadoop.hbase.coordination;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hbase.classification.InterfaceAudience;
import org.apache.hadoop.hbase.CoordinatedStateException;
import org.apache.hadoop.hbase.HBaseInterfaceAudience;
import org.apache.hadoop.hbase.Server;
import org.apache.hadoop.hbase.TableStateManager;
import org.apache.hadoop.hbase.zookeeper.ZKTableStateManager;
import org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher;
import org.apache.zookeeper.KeeperException;

/**
 * ZooKeeper-based implementation of {@link org.apache.hadoop.hbase.CoordinatedStateManager}.
 */
@InterfaceAudience.LimitedPrivate(HBaseInterfaceAudience.CONFIG)
public class ZkCoordinatedStateManager extends BaseCoordinatedStateManager {
    private static final Log LOG = LogFactory.getLog(ZkCoordinatedStateManager.class);
    protected Server server;
    protected ZooKeeperWatcher watcher;
    protected SplitTransactionCoordination splitTransactionCoordination;
    protected CloseRegionCoordination closeRegionCoordination;
    protected SplitLogWorkerCoordination splitLogWorkerCoordination;
    protected SplitLogManagerCoordination splitLogManagerCoordination;
    protected OpenRegionCoordination openRegionCoordination;
    protected RegionMergeCoordination regionMergeCoordination;

    @Override
    public void initialize(Server server) {
        this.server = server;
        //这里体现了针对抽象变成的技巧,具体的实现都是和Zookeeper相关
        this.watcher = server.getZooKeeper();
        splitLogWorkerCoordination = new ZkSplitLogWorkerCoordination(this, watcher);
        splitLogManagerCoordination = new ZKSplitLogManagerCoordination(this, watcher);
        splitTransactionCoordination = new ZKSplitTransactionCoordination(this, watcher);
        closeRegionCoordination = new ZkCloseRegionCoordination(this, watcher);
        openRegionCoordination = new ZkOpenRegionCoordination(this, watcher);
        regionMergeCoordination = new ZkRegionMergeCoordination(this, watcher);
    }

    @Override
    public Server getServer() {
        return server;
    }

    @Override
    public TableStateManager getTableStateManager() throws InterruptedException,
            CoordinatedStateException {
        try {
            return new ZKTableStateManager(server.getZooKeeper());
        } catch (KeeperException e) {
            throw new CoordinatedStateException(e);
        }
    }

    @Override
    public SplitLogWorkerCoordination getSplitLogWorkerCoordination() {
        return splitLogWorkerCoordination;
    }

    @Override
    public SplitLogManagerCoordination getSplitLogManagerCoordination() {
        return splitLogManagerCoordination;
    }

    @Override
    public SplitTransactionCoordination getSplitTransactionCoordination() {
        return splitTransactionCoordination;
    }

    @Override
    public CloseRegionCoordination getCloseRegionCoordination() {
        return closeRegionCoordination;
    }

    @Override
    public OpenRegionCoordination getOpenRegionCoordination() {
        return openRegionCoordination;
    }

    @Override
    public RegionMergeCoordination getRegionMergeCoordination() {
        return regionMergeCoordination;
    }
}