123 lines
4.1 KiB
Java
123 lines
4.1 KiB
Java
/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package nginx.unit.websocket.pojo;
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import java.io.IOException;
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import java.lang.reflect.Method;
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import java.nio.ByteBuffer;
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import javax.websocket.EncodeException;
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import javax.websocket.MessageHandler;
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import javax.websocket.RemoteEndpoint;
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import javax.websocket.Session;
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import org.apache.tomcat.util.ExceptionUtils;
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import nginx.unit.websocket.WrappedMessageHandler;
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/**
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* Common implementation code for the POJO message handlers.
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*
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* @param <T> The type of message to handle
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*/
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public abstract class PojoMessageHandlerBase<T>
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implements WrappedMessageHandler {
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protected final Object pojo;
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protected final Method method;
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protected final Session session;
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protected final Object[] params;
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protected final int indexPayload;
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protected final boolean convert;
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protected final int indexSession;
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protected final long maxMessageSize;
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public PojoMessageHandlerBase(Object pojo, Method method,
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Session session, Object[] params, int indexPayload, boolean convert,
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int indexSession, long maxMessageSize) {
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this.pojo = pojo;
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this.method = method;
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// TODO: The method should already be accessible here but the following
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// code seems to be necessary in some as yet not fully understood cases.
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try {
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this.method.setAccessible(true);
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} catch (Exception e) {
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// It is better to make sure the method is accessible, but
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// ignore exceptions and hope for the best
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}
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this.session = session;
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this.params = params;
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this.indexPayload = indexPayload;
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this.convert = convert;
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this.indexSession = indexSession;
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this.maxMessageSize = maxMessageSize;
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}
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protected final void processResult(Object result) {
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if (result == null) {
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return;
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}
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RemoteEndpoint.Basic remoteEndpoint = session.getBasicRemote();
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try {
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if (result instanceof String) {
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remoteEndpoint.sendText((String) result);
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} else if (result instanceof ByteBuffer) {
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remoteEndpoint.sendBinary((ByteBuffer) result);
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} else if (result instanceof byte[]) {
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remoteEndpoint.sendBinary(ByteBuffer.wrap((byte[]) result));
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} else {
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remoteEndpoint.sendObject(result);
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}
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} catch (IOException | EncodeException ioe) {
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throw new IllegalStateException(ioe);
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}
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}
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/**
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* Expose the POJO if it is a message handler so the Session is able to
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* match requests to remove handlers if the original handler has been
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* wrapped.
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*/
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@Override
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public final MessageHandler getWrappedHandler() {
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if (pojo instanceof MessageHandler) {
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return (MessageHandler) pojo;
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} else {
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return null;
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}
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}
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@Override
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public final long getMaxMessageSize() {
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return maxMessageSize;
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}
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protected final void handlePojoMethodException(Throwable t) {
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t = ExceptionUtils.unwrapInvocationTargetException(t);
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ExceptionUtils.handleThrowable(t);
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if (t instanceof RuntimeException) {
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throw (RuntimeException) t;
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} else {
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throw new RuntimeException(t.getMessage(), t);
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}
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}
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}
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