| /* |
| * Copyright 2013 Paul Merlin. |
| * |
| * 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 org.apache.zest.api.activation; |
| |
| import java.io.PrintStream; |
| import java.util.logging.Level; |
| import java.util.logging.Logger; |
| import org.apache.zest.api.structure.Application; |
| |
| /** |
| * Application Passivation Thread to use as a Shutdown Hook. |
| * <pre>Runtime.getRuntime().addShutdownHook( new ApplicationPassivationThread( application ) );</pre> |
| * <p>Constructors to control where errors are logged are provided. They support PrintStream (STDOUT/STDERR) and SLF4J |
| * Loggers. Defaults to STDERR.</p> |
| */ |
| public final class ApplicationPassivationThread |
| extends Thread |
| { |
| /** |
| * Create a new Application Passivation Thread that output errors to STDERR. |
| * @param application The Application to passivate |
| */ |
| public ApplicationPassivationThread( final Application application ) |
| { |
| this( application, null, null ); |
| } |
| |
| /** |
| * Create a new Application Passivation Thread that output errors to a Logger. |
| * @param application The Application to passivate |
| * @param logger Logger for errors |
| */ |
| public ApplicationPassivationThread( Application application, Logger logger ) |
| { |
| this( application, null, logger ); |
| } |
| |
| /** |
| * Create a new Application Passivation Thread that output errors to a PrintStream. |
| * @param application The Application to passivate |
| * @param output PrintStream for errors |
| */ |
| public ApplicationPassivationThread( Application application, PrintStream output ) |
| { |
| this( application, output, null ); |
| } |
| |
| private ApplicationPassivationThread( Application application, PrintStream output, Logger logger ) |
| { |
| super( new ApplicationPassivation( application, output, logger ), |
| application.name() + " Passivation Thread" ); |
| } |
| |
| private static class ApplicationPassivation |
| implements Runnable |
| { |
| |
| private final Application application; |
| private final PrintStream output; |
| private final Logger logger; |
| |
| private ApplicationPassivation( Application application, PrintStream output, Logger logger ) |
| { |
| this.application = application; |
| this.output = output; |
| this.logger = logger; |
| } |
| |
| @Override |
| public void run() |
| { |
| try |
| { |
| application.passivate(); |
| } |
| catch( PassivationException ex ) |
| { |
| String message = application.name() + " " + ex.getMessage(); |
| if( logger != null ) |
| { |
| logger.log( Level.SEVERE, message, ex ); |
| } |
| else if( output != null ) |
| { |
| output.println( message ); |
| ex.printStackTrace( output ); |
| } |
| else |
| { |
| ex.printStackTrace(); |
| } |
| } |
| } |
| |
| } |
| |
| } |