/*
* Copyright 2010 LinkedIn, Inc
*
* Licensed 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 azkaban.web;
import azkaban.app.AzkabanApplication;
import java.io.File;
import java.io.IOException;
import java.util.Collections;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
/**
* A ServletContextListener that loads the batch application
*
* @author jkreps
*
*/
public class AzkabanServletContextListener implements ServletContextListener {
public static final String AZKABAN_SERVLET_CONTEXT_KEY = "azkaban_app";
private static final String AZKABAN_HOME_VAR_NAME = "AZKABAN_HOME";
private AzkabanApplication app;
/**
* Delete the app
*/
public void contextDestroyed(ServletContextEvent event) {
this.app = null;
}
/**
* Load the app
*/
public void contextInitialized(ServletContextEvent event) {
String homeDir = System.getenv(AZKABAN_HOME_VAR_NAME);
if(homeDir == null)
throw new IllegalStateException("The environment variable " + AZKABAN_HOME_VAR_NAME
+ " has not been set.");
if(!new File(homeDir).isDirectory() || !new File(homeDir).canRead())
throw new IllegalStateException(homeDir + " is not a readable directory.");
try {
File logDir = new File(homeDir, "logs");
File jobDir = new File(homeDir, "jobs");
File tempDir = new File(homeDir, "temp");
this.app = new AzkabanApplication(Collections.singletonList(jobDir), logDir, tempDir, false);
} catch(IOException e) {
throw new IllegalArgumentException(e);
}
event.getServletContext().setAttribute(AZKABAN_SERVLET_CONTEXT_KEY, this.app);
}
}