MycatConfig.java

/*
 * Copyright (c) 2013, OpenCloudDB/MyCAT and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software;Designed and Developed mainly by many Chinese 
 * opensource volunteers. you can redistribute it and/or modify it under the 
 * terms of the GNU General Public License version 2 only, as published by the
 * Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 * 
 * Any questions about this component can be directed to it's project Web address 
 * https://code.google.com/p/opencloudb/.
 *
 */
package org.opencloudb;

import java.util.Map;
import java.util.concurrent.locks.ReentrantLock;

import org.opencloudb.backend.PhysicalDBNode;
import org.opencloudb.backend.PhysicalDBPool;
import org.opencloudb.config.model.QuarantineConfig;
import org.opencloudb.config.model.SchemaConfig;
import org.opencloudb.config.model.SystemConfig;
import org.opencloudb.config.model.UserConfig;
import org.opencloudb.util.TimeUtil;

/**
 * @author mycat
 */
public class MycatConfig {
	private static final int RELOAD = 1;
	private static final int ROLLBACK = 2;

	private volatile SystemConfig system;
	private volatile MycatCluster cluster;
	private volatile MycatCluster _cluster;
	private volatile QuarantineConfig quarantine;
	private volatile QuarantineConfig _quarantine;
	private volatile Map<String, UserConfig> users;
	private volatile Map<String, UserConfig> _users;
	private volatile Map<String, SchemaConfig> schemas;
	private volatile Map<String, SchemaConfig> _schemas;
	private volatile Map<String, PhysicalDBNode> dataNodes;
	private volatile Map<String, PhysicalDBNode> _dataNodes;
	private volatile Map<String, PhysicalDBPool> dataHosts;
	private volatile Map<String, PhysicalDBPool> _dataHosts;
	private long reloadTime;
	private long rollbackTime;
	private int status;
	private final ReentrantLock lock;

	public MycatConfig() {
		ConfigInitializer confInit = new ConfigInitializer();
		this.system = confInit.getSystem();
		this.users = confInit.getUsers();
		this.schemas = confInit.getSchemas();
		this.dataHosts = confInit.getDataHosts();
		this.dataNodes = confInit.getDataNodes();
		this.quarantine = confInit.getQuarantine();
		this.cluster = confInit.getCluster();

		this.reloadTime = TimeUtil.currentTimeMillis();
		this.rollbackTime = -1L;
		this.status = RELOAD;
		this.lock = new ReentrantLock();
	}

	public SystemConfig getSystem() {
		return system;
	}

	public Map<String, UserConfig> getUsers() {
		return users;
	}

	public Map<String, UserConfig> getBackupUsers() {
		return _users;
	}

	public Map<String, SchemaConfig> getSchemas() {
		return schemas;
	}

	public Map<String, SchemaConfig> getBackupSchemas() {
		return _schemas;
	}

	public Map<String, PhysicalDBNode> getDataNodes() {
		return dataNodes;
	}

	public Map<String, PhysicalDBNode> getBackupDataNodes() {
		return _dataNodes;
	}

	public Map<String, PhysicalDBPool> getDataHosts() {
		return dataHosts;
	}

	public Map<String, PhysicalDBPool> getBackupDataHosts() {
		return _dataHosts;
	}

	public MycatCluster getCluster() {
		return cluster;
	}

	public MycatCluster getBackupCluster() {
		return _cluster;
	}

	public QuarantineConfig getQuarantine() {
		return quarantine;
	}

	public QuarantineConfig getBackupQuarantine() {
		return _quarantine;
	}

	public ReentrantLock getLock() {
		return lock;
	}

	public long getReloadTime() {
		return reloadTime;
	}

	public long getRollbackTime() {
		return rollbackTime;
	}

	public void reload(Map<String, UserConfig> users,
			Map<String, SchemaConfig> schemas,
			Map<String, PhysicalDBNode> dataNodes,
			Map<String, PhysicalDBPool> dataHosts, MycatCluster cluster,
			QuarantineConfig quarantine) {
		apply(users, schemas, dataNodes, dataHosts, cluster, quarantine);
		this.reloadTime = TimeUtil.currentTimeMillis();
		this.status = RELOAD;
	}

	public boolean canRollback() {
		if (_users == null || _schemas == null || _dataNodes == null
				|| _dataHosts == null || _cluster == null
				|| _quarantine == null || status == ROLLBACK) {
			return false;
		} else {
			return true;
		}
	}

	public void rollback(Map<String, UserConfig> users,
			Map<String, SchemaConfig> schemas,
			Map<String, PhysicalDBNode> dataNodes,
			Map<String, PhysicalDBPool> dataHosts, MycatCluster cluster,
			QuarantineConfig quarantine) {
		apply(users, schemas, dataNodes, dataHosts, cluster, quarantine);
		this.rollbackTime = TimeUtil.currentTimeMillis();
		this.status = ROLLBACK;
	}

	private void apply(Map<String, UserConfig> users,
			Map<String, SchemaConfig> schemas,
			Map<String, PhysicalDBNode> dataNodes,
			Map<String, PhysicalDBPool> dataHosts, MycatCluster cluster,
			QuarantineConfig quarantine) {
		final ReentrantLock lock = this.lock;
		lock.lock();
		try {
			// stop datasource heartbeat
			Map<String, PhysicalDBPool> oldDataHosts = this.dataHosts;
			if (oldDataHosts != null) {
				for (PhysicalDBPool n : oldDataHosts.values()) {
					if (n != null) {
						n.stopHeartbeat();
					}
				}
			}

			this._users = this.users;
			this._schemas = this.schemas;
			this._dataNodes = this.dataNodes;
			this._dataHosts = this.dataHosts;
			this._cluster = this.cluster;
			this._quarantine = this.quarantine;

			// start datasoruce heartbeat
			if (dataNodes != null) {
				for (PhysicalDBPool n : dataHosts.values()) {
					if (n != null) {
						n.startHeartbeat();
					}
				}
			}

			this.users = users;
			this.schemas = schemas;
			this.dataNodes = dataNodes;
			this.dataHosts = dataHosts;
			this.cluster = cluster;
			this.quarantine = quarantine;
		} finally {
			lock.unlock();
		}
	}

}