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java/org/apache/tomcat/websocket/AsyncChannelWrapperNonSecure.java

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+/*
+ *  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.tomcat.websocket;
+
+import java.io.IOException;
+import java.nio.ByteBuffer;
+import java.nio.channels.AsynchronousSocketChannel;
+import java.nio.channels.CompletionHandler;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.Future;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.TimeoutException;
+
+/**
+ * Generally, just passes calls straight to the wrapped
+ * {@link AsynchronousSocketChannel}. In some cases exceptions may be swallowed
+ * to save them being swallowed by the calling code.
+ */
+public class AsyncChannelWrapperNonSecure implements AsyncChannelWrapper {
+
+    private static final Future<Void> NOOP_FUTURE = new NoOpFuture();
+
+    private final AsynchronousSocketChannel socketChannel;
+
+    public AsyncChannelWrapperNonSecure(
+            AsynchronousSocketChannel socketChannel) {
+        this.socketChannel = socketChannel;
+    }
+
+    @Override
+    public Future<Integer> read(ByteBuffer dst) {
+        return socketChannel.read(dst);
+    }
+
+    @Override
+    public <B,A extends B> void read(ByteBuffer dst, A attachment,
+            CompletionHandler<Integer,B> handler) {
+        socketChannel.read(dst, attachment, handler);
+    }
+
+    @Override
+    public Future<Integer> write(ByteBuffer src) {
+        return socketChannel.write(src);
+    }
+
+    @Override
+    public <B,A extends B> void write(ByteBuffer[] srcs, int offset, int length,
+            long timeout, TimeUnit unit, A attachment,
+            CompletionHandler<Long,B> handler) {
+        socketChannel.write(
+                srcs, offset, length, timeout, unit, attachment, handler);
+    }
+
+    @Override
+    public void close() {
+        try {
+            socketChannel.close();
+        } catch (IOException e) {
+            // Ignore
+        }
+    }
+
+    @Override
+    public Future<Void> handshake() {
+        return NOOP_FUTURE;
+    }
+
+
+    private static final class NoOpFuture implements Future<Void> {
+
+        @Override
+        public boolean cancel(boolean mayInterruptIfRunning) {
+            return false;
+        }
+
+        @Override
+        public boolean isCancelled() {
+            return false;
+        }
+
+        @Override
+        public boolean isDone() {
+            return true;
+        }
+
+        @Override
+        public Void get() throws InterruptedException, ExecutionException {
+            return null;
+        }
+
+        @Override
+        public Void get(long timeout, TimeUnit unit)
+                throws InterruptedException, ExecutionException,
+                TimeoutException {
+            return null;
+        }
+    }
+}