| /* |
| * 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 org.apache.axis2.format; |
| |
| import java.io.FilterInputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.lang.reflect.InvocationHandler; |
| import java.lang.reflect.InvocationTargetException; |
| import java.lang.reflect.Method; |
| import java.lang.reflect.Proxy; |
| import java.util.Collections; |
| import java.util.LinkedList; |
| import java.util.List; |
| |
| import javax.activation.DataSource; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| |
| /** |
| * Utility class to create {@link ManagedDataSource} objects. |
| */ |
| public class ManagedDataSourceFactory { |
| private static class ManagedInputStream extends FilterInputStream { |
| private DataSourceManager manager; |
| |
| public ManagedInputStream(DataSourceManager manager, InputStream parent) { |
| super(parent); |
| this.manager = manager; |
| } |
| |
| @Override |
| public void close() throws IOException { |
| if (manager != null) { |
| manager.notifyStreamClosed(this); |
| manager = null; |
| } |
| super.close(); |
| } |
| } |
| |
| private static class DataSourceManager implements InvocationHandler { |
| private static final Log log = LogFactory.getLog(DataSourceManager.class); |
| |
| private static final Method getInputStreamMethod; |
| private static final Method destroyMethod; |
| |
| static { |
| try { |
| getInputStreamMethod = DataSource.class.getMethod("getInputStream"); |
| destroyMethod = ManagedDataSource.class.getMethod("destroy"); |
| } catch (NoSuchMethodException ex) { |
| throw new NoSuchMethodError(ex.getMessage()); |
| } |
| } |
| |
| private final DataSource dataSource; |
| private final List<ManagedInputStream> openStreams = Collections.synchronizedList( |
| new LinkedList<ManagedInputStream>()); |
| |
| public DataSourceManager(DataSource dataSource) { |
| this.dataSource = dataSource; |
| } |
| |
| public void notifyStreamClosed(ManagedInputStream managedInputStream) { |
| if (!openStreams.remove(managedInputStream)) { |
| throw new IllegalStateException(); |
| } |
| } |
| |
| public Object invoke(Object proxy, Method method, Object[] args) throws Throwable { |
| try { |
| if (method.equals(getInputStreamMethod)) { |
| InputStream in = (InputStream)method.invoke(dataSource, args); |
| ManagedInputStream in2 = new ManagedInputStream(this, in); |
| openStreams.add(in2); |
| return in2; |
| } else if (method.equals(destroyMethod)) { |
| while (!openStreams.isEmpty()) { |
| try { |
| openStreams.get(0).close(); |
| } catch (IOException ex) { |
| log.warn("Exception when closing open stream from managed data source", ex); |
| } |
| } |
| return null; |
| } else { |
| return method.invoke(dataSource, args); |
| } |
| } catch (InvocationTargetException ex) { |
| throw ex.getCause(); |
| } |
| } |
| |
| } |
| |
| /** |
| * Create a {@link ManagedDataSource} proxy for an existing data source. |
| * This will create a dynamic proxy implementing the same interfaces as |
| * the original data source. |
| * |
| * @param ds the original data source |
| * @return a data source proxy implementing {@link ManagedDataSource} |
| */ |
| public static ManagedDataSource create(DataSource ds) { |
| Class<?>[] orgIfaces = ds.getClass().getInterfaces(); |
| Class<?>[] ifaces = new Class[orgIfaces.length+1]; |
| ifaces[0] = ManagedDataSource.class; |
| System.arraycopy(orgIfaces, 0, ifaces, 1, orgIfaces.length); |
| return (ManagedDataSource)Proxy.newProxyInstance( |
| ManagedDataSourceFactory.class.getClassLoader(), ifaces, |
| new DataSourceManager(ds)); |
| } |
| } |