/* * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER. * * Copyright (c) 2015 Oracle and/or its affiliates. All rights reserved. * * The contents of this file are subject to the terms of either the GNU * General Public License Version 2 only ("GPL") or the Common Development * and Distribution License("CDDL") (collectively, the "License"). You * may not use this file except in compliance with the License. You can * obtain a copy of the License at * http://glassfish.java.net/public/CDDL+GPL_1_1.html * or packager/legal/LICENSE.txt. See the License for the specific * language governing permissions and limitations under the License. * * When distributing the software, include this License Header Notice in each * file and include the License file at packager/legal/LICENSE.txt. * * GPL Classpath Exception: * Oracle designates this particular file as subject to the "Classpath" * exception as provided by Oracle in the GPL Version 2 section of the License * file that accompanied this code. * * Modifications: * If applicable, add the following below the License Header, with the fields * enclosed by brackets [] replaced by your own identifying information: * "Portions Copyright [year] [name of copyright owner]" * * Contributor(s): * If you wish your version of this file to be governed by only the CDDL or * only the GPL Version 2, indicate your decision by adding "[Contributor] * elects to include this software in this distribution under the [CDDL or GPL * Version 2] license." If you don't indicate a single choice of license, a * recipient has the option to distribute your version of this file under * either the CDDL, the GPL Version 2 or to extend the choice of license to * its licensees as provided above. However, if you add GPL Version 2 code * and therefore, elected the GPL Version 2 license, then the option applies * only if the new code is made subject to such option by the copyright * holder. */ package org.glassfish.jersey.jdk.connector; import java.io.IOException; import java.io.OutputStream; /** * A stream that invokes {@link FirstCallListener} when any operation is invoked. * {@link FirstCallListener} is invoked only once in the stream lifetime. * * @author Petr Janouch (petr.janouch at oracle.com) */ class InterceptingOutputStream extends OutputStream { private final OutputStream wrappedStream; private final FirstCallListener firstCallListener; private volatile boolean listenerInvoked = false; InterceptingOutputStream(OutputStream wrappedStream, FirstCallListener firstCallListener) { this.wrappedStream = wrappedStream; this.firstCallListener = firstCallListener; } @Override public void write(byte[] b) throws IOException { tryInvokingListener(); wrappedStream.write(b); } @Override public void write(byte[] b, int off, int len) throws IOException { tryInvokingListener(); wrappedStream.write(b, off, len); } @Override public void flush() throws IOException { tryInvokingListener(); wrappedStream.flush(); } @Override public void close() throws IOException { tryInvokingListener(); wrappedStream.close(); } @Override public void write(int b) throws IOException { tryInvokingListener(); wrappedStream.write(b); } private void tryInvokingListener() { if (!listenerInvoked) { listenerInvoked = true; this.firstCallListener.onInvoked(); } } interface FirstCallListener { void onInvoked(); } }