com.glaf.core.execution.ExecutionManager.java Source code

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Here is the source code for com.glaf.core.execution.ExecutionManager.java

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/*
 * 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.execution;

import java.util.Enumeration;
import java.util.Iterator;
import java.util.Map;
import java.util.Properties;
import java.util.concurrent.atomic.AtomicBoolean;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import com.glaf.core.config.DBConfiguration;
import com.glaf.core.config.Environment;
import com.glaf.core.util.ClassUtils;

public class ExecutionManager {
    private static class ExecutionManagerHolder {
        public static ExecutionManager instance = new ExecutionManager();
    }

    private static final Log logger = LogFactory.getLog(ExecutionManager.class);

    protected static AtomicBoolean running = new AtomicBoolean(false);

    public static ExecutionManager getInstance() {
        return ExecutionManagerHolder.instance;
    }

    private ExecutionManager() {

    }

    public void execute() {
        if (!running.get()) {
            String defaultSystemName = Environment.getCurrentSystemName();
            try {
                running.set(true);
                ExecutionProperties.reload();
                Properties props = ExecutionProperties.getProperties();
                if (props != null && props.keys().hasMoreElements()) {
                    Enumeration<?> e = props.keys();
                    while (e.hasMoreElements()) {
                        String className = (String) e.nextElement();
                        String content = props.getProperty(className);
                        Object object = ClassUtils.instantiateObject(className);
                        if (object instanceof ExecutionHandler) {
                            ExecutionHandler handler = (ExecutionHandler) object;
                            Map<String, Properties> dataSourceProperties = DBConfiguration
                                    .getDataSourceProperties();
                            Iterator<String> iter = dataSourceProperties.keySet().iterator();
                            while (iter.hasNext()) {
                                String systemName = (String) iter.next();
                                Environment.setCurrentSystemName(systemName);
                                try {
                                    handler.execute(content);
                                } catch (Exception ex) {
                                    ex.printStackTrace();
                                    logger.error(ex);
                                }
                            }
                        }
                    }
                }
            } catch (Exception ex) {
                ex.printStackTrace();
                throw new RuntimeException(ex);
            } finally {
                Environment.setCurrentSystemName(defaultSystemName);
                running.set(false);
            }
        }
    }

    public static void main(String[] args) {
        ExecutionManager.getInstance().execute();
    }

}