Java tutorial
/* * 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.synapse.transport.http.conn; import java.io.IOException; import java.net.SocketAddress; import java.nio.ByteBuffer; import java.nio.channels.ByteChannel; import java.nio.channels.SelectionKey; import java.util.concurrent.atomic.AtomicLong; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.apache.http.nio.reactor.IOSession; import org.apache.http.nio.reactor.SessionBufferStatus; /** * Decorator class intended to transparently extend an {@link IOSession} * with basic event logging capabilities using Commons Logging. */ class LoggingIOSession implements IOSession { private static AtomicLong COUNT = new AtomicLong(0); private final Log log; private final Wire wirelog; private final IOSession session; private final ByteChannel channel; private final String id; public LoggingIOSession(final IOSession session, final String id, final Log log, final Log wirelog) { super(); if (session == null) { throw new IllegalArgumentException("I/O session may not be null"); } this.session = session; this.channel = new LoggingByteChannel(); this.id = id + "-" + COUNT.incrementAndGet(); this.log = LogFactory.getLog(session.getClass()); this.wirelog = new Wire(wirelog); } public int getStatus() { return this.session.getStatus(); } public ByteChannel channel() { return this.channel; } public SocketAddress getLocalAddress() { return this.session.getLocalAddress(); } public SocketAddress getRemoteAddress() { return this.session.getRemoteAddress(); } public int getEventMask() { return this.session.getEventMask(); } private static String formatOps(int ops) { StringBuffer buffer = new StringBuffer(6); buffer.append('['); if ((ops & SelectionKey.OP_READ) > 0) { buffer.append('r'); } if ((ops & SelectionKey.OP_WRITE) > 0) { buffer.append('w'); } if ((ops & SelectionKey.OP_ACCEPT) > 0) { buffer.append('a'); } if ((ops & SelectionKey.OP_CONNECT) > 0) { buffer.append('c'); } buffer.append(']'); return buffer.toString(); } public void setEventMask(int ops) { if (this.log.isDebugEnabled()) { this.log.debug("I/O session " + this.id + " " + this.session + ": Set event mask " + formatOps(ops)); } this.session.setEventMask(ops); } public void setEvent(int op) { if (this.log.isDebugEnabled()) { this.log.debug("I/O session " + this.id + " " + this.session + ": Set event " + formatOps(op)); } this.session.setEvent(op); } public void clearEvent(int op) { if (this.log.isDebugEnabled()) { this.log.debug("I/O session " + this.id + " " + this.session + ": Clear event " + formatOps(op)); } this.session.clearEvent(op); } public void close() { if (this.log.isDebugEnabled()) { this.log.debug("I/O session " + this.id + " " + this.session + ": Close"); } this.session.close(); } public boolean isClosed() { return this.session.isClosed(); } public void shutdown() { if (this.log.isDebugEnabled()) { this.log.debug("I/O session " + this.id + " " + this.session + ": Shutdown"); } this.session.shutdown(); } public int getSocketTimeout() { return this.session.getSocketTimeout(); } public void setSocketTimeout(int timeout) { if (this.log.isDebugEnabled()) { this.log.debug("I/O session " + this.id + " " + this.session + ": Set timeout " + timeout); } this.session.setSocketTimeout(timeout); } public void setBufferStatus(final SessionBufferStatus status) { this.session.setBufferStatus(status); } public boolean hasBufferedInput() { return this.session.hasBufferedInput(); } public boolean hasBufferedOutput() { return this.session.hasBufferedOutput(); } public Object getAttribute(final String name) { return this.session.getAttribute(name); } public void setAttribute(final String name, final Object obj) { if (this.log.isDebugEnabled()) { this.log.debug("I/O session " + this.id + " " + this.session + ": Set attribute " + name); } this.session.setAttribute(name, obj); } public Object removeAttribute(final String name) { if (this.log.isDebugEnabled()) { this.log.debug("I/O session " + this.id + " " + this.session + ": Remove attribute " + name); } return this.session.removeAttribute(name); } class LoggingByteChannel implements ByteChannel { public int read(final ByteBuffer dst) throws IOException { int bytesRead = session.channel().read(dst); if (log.isDebugEnabled()) { log.debug("I/O session " + id + " " + session + ": " + bytesRead + " bytes read"); } if (bytesRead > 0 && wirelog.isEnabled()) { ByteBuffer b = dst.duplicate(); int p = b.position(); b.limit(p); b.position(p - bytesRead); wirelog.input(b); } return bytesRead; } public int write(final ByteBuffer src) throws IOException { int byteWritten = session.channel().write(src); if (log.isDebugEnabled()) { log.debug("I/O session " + id + " " + session + ": " + byteWritten + " bytes written"); } if (byteWritten > 0 && wirelog.isEnabled()) { ByteBuffer b = src.duplicate(); int p = b.position(); b.limit(p); b.position(p - byteWritten); wirelog.output(b); } return byteWritten; } public void close() throws IOException { if (log.isDebugEnabled()) { log.debug("I/O session " + id + " " + session + ": Channel close"); } session.channel().close(); } public boolean isOpen() { return session.channel().isOpen(); } } }