com.glaf.core.jdbc.datasource.MultiRoutingDataSource.java Source code

Introduction

Here is the source code for com.glaf.core.jdbc.datasource.MultiRoutingDataSource.java

Source

/*
 * 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.glaf.core.jdbc.datasource;

import java.util.Map;
import java.util.Map.Entry;
import java.util.Properties;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.atomic.AtomicBoolean;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.commons.lang3.StringUtils;
import org.springframework.context.ApplicationListener;
import org.springframework.context.event.ContextRefreshedEvent;
import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource;

import com.glaf.core.config.DBConfiguration;
import com.glaf.core.config.Environment;
import com.glaf.core.jdbc.connection.ConnectionProvider;
import com.glaf.core.jdbc.connection.ConnectionProviderFactory;

public class MultiRoutingDataSource extends AbstractRoutingDataSource
        implements ApplicationListener<ContextRefreshedEvent> {
    protected final static Log logger = LogFactory.getLog(MultiRoutingDataSource.class);

    private static volatile ConcurrentMap<Object, Object> targetDataSources = new ConcurrentHashMap<Object, Object>();

    private static volatile AtomicBoolean loading = new AtomicBoolean(false);

    private static volatile AtomicBoolean reload = new AtomicBoolean(false);

    private static volatile Object defaultTargetDataSource;

    public static void addDataSource(String name, Properties props) {
        if (!targetDataSources.containsKey(name)) {
            ConnectionProvider provider = ConnectionProviderFactory.createProvider(name, props);
            if (provider != null && provider.getDataSource() != null) {
                targetDataSources.put(name, provider.getDataSource());
                reload.set(true);
            }
        }
    }

    private static void reloadDS() {
        if (!loading.get()) {
            try {
                loading.set(true);
                logger.info("--------------MultiRoutingDataSource reloadDS()------------");
                Map<Object, Object> dataSourceMap = new java.util.HashMap<Object, Object>();
                Map<String, Properties> dataSourceProperties = DBConfiguration.getDataSourceProperties();
                Set<Entry<String, Properties>> entrySet = dataSourceProperties.entrySet();
                for (Entry<String, Properties> entry : entrySet) {
                    String name = entry.getKey();
                    Properties props = entry.getValue();
                    if (props != null && StringUtils.isNotEmpty(name)) {
                        try {
                            ConnectionProvider provider = ConnectionProviderFactory.createProvider(name);
                            if (provider != null) {
                                dataSourceMap.put(name, provider.getDataSource());
                                if (StringUtils.equals(name, Environment.DEFAULT_SYSTEM_NAME)) {
                                    defaultTargetDataSource = provider.getDataSource();
                                }
                            }
                        } catch (Exception ex) {
                            ex.printStackTrace();
                            logger.error(ex);
                        }
                    }
                }

                if (defaultTargetDataSource == null) {
                    Properties props = DBConfiguration.getProperties(Environment.DEFAULT_SYSTEM_NAME);
                    if (props != null) {
                        ConnectionProvider provider = ConnectionProviderFactory
                                .createProvider(Environment.DEFAULT_SYSTEM_NAME, props);
                        dataSourceMap.put(Environment.DEFAULT_SYSTEM_NAME, provider.getDataSource());
                    }
                }

                targetDataSources.putAll(dataSourceMap);

                logger.info("##datasources:" + targetDataSources.keySet());

            } catch (Exception ex) {
                logger.error(ex);
                ex.printStackTrace();
                throw new RuntimeException(ex);
            } finally {
                loading.set(false);
            }
        }
    }

    public MultiRoutingDataSource() {

    }

    @Override
    public void afterPropertiesSet() {
        reloadDS();
        setDefaultTargetDataSource(defaultTargetDataSource);
        setTargetDataSources(targetDataSources);
        super.afterPropertiesSet();
    }

    @Override
    protected synchronized Object determineCurrentLookupKey() {
        if (reload.get()) {
            setTargetDataSources(targetDataSources);
            super.afterPropertiesSet();
            reload.set(false);
            logger.info("#reload datasources:" + targetDataSources.keySet());
        }
        logger.debug("currentSystemName:" + Environment.getCurrentSystemName());
        return Environment.getCurrentSystemName();
    }

    @Override
    public void onApplicationEvent(ContextRefreshedEvent contextRefreshedEvent) {
        logger.info("-----------------DataSource Launcher----------------------");
        reloadDS();
        setDefaultTargetDataSource(defaultTargetDataSource);
        setTargetDataSources(targetDataSources);
    }

}