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webapps/examples/WEB-INF/classes/websocket/echo/EchoAsyncAnnotation.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 websocket.echo;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.nio.ByteBuffer;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.Future;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.TimeoutException;
+
+import javax.websocket.OnMessage;
+import javax.websocket.PongMessage;
+import javax.websocket.Session;
+
+/**
+ * The three annotated echo endpoints can be used to test with Autobahn and
+ * the following command "wstest -m fuzzingclient -s servers.json". See the
+ * Autobahn documentation for setup and general information.
+ *
+ * Note: This one is disabled by default since it allocates memory, and needs
+ * to be enabled back.
+ */
+//@javax.websocket.server.ServerEndpoint("/websocket/echoAsyncAnnotation")
+public class EchoAsyncAnnotation {
+
+    private static final Future<Void> COMPLETED = new CompletedFuture();
+
+    Future<Void> f = COMPLETED;
+    StringBuilder sb = null;
+    ByteArrayOutputStream bytes = null;
+
+    @OnMessage
+    public void echoTextMessage(Session session, String msg, boolean last) {
+        if (sb == null) {
+            sb = new StringBuilder();
+        }
+        sb.append(msg);
+        if (last) {
+            // Before we send the next message, have to wait for the previous
+            // message to complete
+            try {
+                f.get();
+            } catch (InterruptedException | ExecutionException e) {
+                // Let the container deal with it
+                throw new RuntimeException(e);
+            }
+            f = session.getAsyncRemote().sendText(sb.toString());
+            sb = null;
+        }
+    }
+
+    @OnMessage
+    public void echoBinaryMessage(byte[] msg, Session session, boolean last)
+            throws IOException {
+        if (bytes == null) {
+            bytes = new ByteArrayOutputStream();
+        }
+        bytes.write(msg);
+        if (last) {
+            // Before we send the next message, have to wait for the previous
+            // message to complete
+            try {
+                f.get();
+            } catch (InterruptedException | ExecutionException e) {
+                // Let the container deal with it
+                throw new RuntimeException(e);
+            }
+            f = session.getAsyncRemote().sendBinary(ByteBuffer.wrap(bytes.toByteArray()));
+            bytes = null;
+        }
+    }
+
+    /**
+     * Process a received pong. This is a NO-OP.
+     *
+     * @param pm    Ignored.
+     */
+    @OnMessage
+    public void echoPongMessage(PongMessage pm) {
+        // NO-OP
+    }
+
+    private static class CompletedFuture 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;
+        }
+    }
+}