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+/*
+ * ServiceChannel.java February 2014
+ *
+ * Copyright (C) 2014, Niall Gallagher <niallg@users.sf.net>
+ *
+ * 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.simpleframework.http.socket.service;
+
+import java.io.IOException;
+
+import org.simpleframework.http.socket.Frame;
+import org.simpleframework.http.socket.FrameListener;
+import org.simpleframework.http.socket.Reason;
+import org.simpleframework.http.socket.FrameChannel;
+
+/**
+ * The <code>ServiceChannel</code> represents a full duplex communication
+ * channel as defined by RFC 6455. Any instance of this will provide
+ * a means to perform asynchronous writes and reads to a remote client
+ * using a lightweight framing protocol. A frame is a finite length
+ * sequence of bytes that can hold either text or binary data. Also,
+ * control frames are used to perform heartbeat monitoring and closure.
+ * <p>
+ * For convenience frames can be consumed from the socket via a
+ * callback to a registered listener. This avoids having to poll each
+ * socket for data and provides a asynchronous event driven model of
+ * communication, which greatly reduces overhead and complication.
+ *
+ * @author Niall Gallagher
+ */
+class ServiceChannel implements FrameChannel {
+
+ /**
+ * This is the internal channel for full duplex communication.
+ */
+ private final FrameChannel channel;
+
+ /**
+ * Constructor for the <code>ServiceChannel</code> object. This is
+ * used to create a channel that is given to the application. This
+ * is synchronized so only one frame can be dispatched at a time.
+ *
+ * @param channel this is the channel to delegate to
+ */
+ public ServiceChannel(FrameChannel channel) {
+ this.channel = channel;
+ }
+
+ /**
+ * This is used to send data to the connected client. To prevent
+ * an application code from causing resource issues this will block
+ * as soon as a configured linked list of mapped memory buffers has
+ * been exhausted. Caution should be taken when writing a broadcast
+ * implementation that can write to multiple sockets as a badly
+ * behaving socket that has filled its output buffering capacity
+ * can cause congestion.
+ *
+ * @param data this is the data that is to be sent
+ */
+ public synchronized void send(byte[] data) throws IOException {
+ channel.send(data);
+ }
+
+ /**
+ * This is used to send text to the connected client. To prevent
+ * an application code from causing resource issues this will block
+ * as soon as a configured linked list of mapped memory buffers has
+ * been exhausted. Caution should be taken when writing a broadcast
+ * implementation that can write to multiple sockets as a badly
+ * behaving socket that has filled its output buffering capacity
+ * can cause congestion.
+ *
+ * @param text this is the text that is to be sent
+ */
+ public synchronized void send(String text) throws IOException {
+ channel.send(text);
+ }
+
+ /**
+ * This is used to send data to the connected client. To prevent
+ * an application code from causing resource issues this will block
+ * as soon as a configured linked list of mapped memory buffers has
+ * been exhausted. Caution should be taken when writing a broadcast
+ * implementation that can write to multiple sockets as a badly
+ * behaving socket that has filled its output buffering capacity
+ * can cause congestion.
+ *
+ * @param frame this is the frame that is to be sent
+ */
+ public synchronized void send(Frame frame) throws IOException {
+ channel.send(frame);
+ }
+
+ /**
+ * This is used to register a <code>FrameListener</code> to this
+ * instance. The registered listener will receive all user frames
+ * and control frames sent from the client. Also, when the frame
+ * is closed or when an unexpected error occurs the listener is
+ * notified. Any number of listeners can be registered at any time.
+ *
+ * @param listener this is the listener that is to be registered
+ */
+ public synchronized void register(FrameListener listener) throws IOException {
+ channel.register(listener);
+ }
+
+ /**
+ * This is used to remove a <code>FrameListener</code> from this
+ * instance. After removal the listener will no longer receive
+ * any user frames or control messages from this specific instance.
+ *
+ * @param listener this is the listener to be removed
+ */
+ public synchronized void remove(FrameListener listener) throws IOException {
+ channel.remove(listener);
+ }
+
+ /**
+ * This is used to close the connection with a specific reason.
+ * The close reason will be sent as a control frame before the
+ * TCP connection is terminated.
+ *
+ * @param reason the reason for closing the connection
+ */
+ public synchronized void close(Reason reason) throws IOException {
+ channel.close(reason);
+ }
+
+ /**
+ * This is used to close the connection without a specific reason.
+ * The close reason will be sent as a control frame before the
+ * TCP connection is terminated.
+ */
+ public void close() throws IOException {
+ channel.close();
+ }
+}