com.github.javaclub.cdl.client.group.SGroupDataSource Maven / Gradle / Ivy

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Javaclub CDL
There is a newer version: 2.3.9
package com.github.javaclub.cdl.client.group;

import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.SQLException;
import java.sql.SQLFeatureNotSupportedException;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.logging.Logger;

import javax.sql.DataSource;

import com.github.javaclub.cdl.client.common.DataSourceWrapper;
import com.github.javaclub.cdl.client.config.DbConfigManager;

/**
 * 一个group表示一组主备的db库，下面可以有若干atom持有数据源
 */
public class SGroupDataSource implements DataSource {
	
	private String groupName;
	private static ThreadLocal targetThreadLocal;
	private int retryingTimes = 3;
	private AtomicBoolean inited = new AtomicBoolean(false);
	private DbConfigManager dbConfigManager;
	
	public void init() throws SQLException {
		if(inited.compareAndSet(false,true)){
			dbConfigManager.registerSGroupDataSource(groupName, this);
		}
	}
	
	public DataSourceWrapper getCurrentTarget() {
		if (targetThreadLocal == null) {
			return null;
		}
		DataSourceWrapper dsw = targetThreadLocal.get();
		targetThreadLocal.remove();
		return dsw;
	}

	/**
	 */
	void setWriteTarget(DataSourceWrapper dsw) {
		if (targetThreadLocal != null) {
			targetThreadLocal.set(dsw);
		}
	}

	//当运行期间主备发生切换时是否需要查找第一个可写的库
	private boolean autoSelectWriteDataSource = false;

	public boolean getAutoSelectWriteDataSource() {
		return autoSelectWriteDataSource;
	}

	public void setAutoSelectWriteDataSource(boolean autoSelectWriteDataSource) {
		this.autoSelectWriteDataSource = autoSelectWriteDataSource;
	}

	DBSelector getDBSelector(boolean isRead) throws SQLException {
		if(!inited.get()){
			throw new SQLException("init method not be invoked at first, check your spring bean");
		}
		return dbConfigManager.getDBSelector(groupName, isRead);
	}

	/*----------------------------  jdbc 规范 ----------------------------------- */
	private PrintWriter out = null;

	@Override
	public PrintWriter getLogWriter() throws SQLException {
		return out;
	}

	@Override
	public void setLogWriter(PrintWriter out) throws SQLException {
		this.out = out;
	}

	private int seconds = 0;

	@Override
	public void setLoginTimeout(int seconds) throws SQLException {
		this.seconds = seconds;
	}

	@Override
	public int getLoginTimeout() throws SQLException {
		return seconds;
	}

	@Override
	public Logger getParentLogger() throws SQLFeatureNotSupportedException {
		return null;
	}

	@SuppressWarnings("unchecked")
	@Override
	public  T unwrap(Class iface) throws SQLException {
		try {
			return (T) this;
		} catch (Exception e) {
			throw new SQLException(e);
		}
	}

	@Override
	public boolean isWrapperFor(Class iface) throws SQLException {
		return this.getClass().isAssignableFrom(iface);
	}

	@Override
	public Connection getConnection() throws SQLException {
		if(!inited.get()){
			throw new SQLException("init method not be invoked at first, check your spring bean");
		}
		return new SGroupConnection(this);
	}

	@Override
	public Connection getConnection(String username, String password) throws SQLException {
		if(!inited.get()){
			throw new SQLException("init method not be invoked at first, check your spring bean");
		}
		return new SGroupConnection(this, username, password);
	}

	/*----------------------------  jdbc 规范 ----------------------------------- */

	public int getRetryingTimes() {
		return retryingTimes;
	}

	public void setRetryingTimes(int retryingTimes) {
		this.retryingTimes = retryingTimes;
	}

	public String getGroupName() {
		return groupName;
	}

	public void setGroupName(String groupName) {
		this.groupName = groupName;
	}

	public DbConfigManager getDbConfigManager() {
		return dbConfigManager;
	}

	public void setDbConfigManager(DbConfigManager dbConfigManager) {
		this.dbConfigManager = dbConfigManager;
	}
}