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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 nginx.unit.websocket.pojo;
import java.io.IOException;
import java.lang.reflect.Method;
import java.nio.ByteBuffer;
import javax.websocket.EncodeException;
import javax.websocket.MessageHandler;
import javax.websocket.RemoteEndpoint;
import javax.websocket.Session;
import org.apache.tomcat.util.ExceptionUtils;
import nginx.unit.websocket.WrappedMessageHandler;
/**
* Common implementation code for the POJO message handlers.
*
* @param <T> The type of message to handle
*/
public abstract class PojoMessageHandlerBase<T>
implements WrappedMessageHandler {
protected final Object pojo;
protected final Method method;
protected final Session session;
protected final Object[] params;
protected final int indexPayload;
protected final boolean convert;
protected final int indexSession;
protected final long maxMessageSize;
public PojoMessageHandlerBase(Object pojo, Method method,
Session session, Object[] params, int indexPayload, boolean convert,
int indexSession, long maxMessageSize) {
this.pojo = pojo;
this.method = method;
// TODO: The method should already be accessible here but the following
// code seems to be necessary in some as yet not fully understood cases.
try {
this.method.setAccessible(true);
} catch (Exception e) {
// It is better to make sure the method is accessible, but
// ignore exceptions and hope for the best
}
this.session = session;
this.params = params;
this.indexPayload = indexPayload;
this.convert = convert;
this.indexSession = indexSession;
this.maxMessageSize = maxMessageSize;
}
protected final void processResult(Object result) {
if (result == null) {
return;
}
RemoteEndpoint.Basic remoteEndpoint = session.getBasicRemote();
try {
if (result instanceof String) {
remoteEndpoint.sendText((String) result);
} else if (result instanceof ByteBuffer) {
remoteEndpoint.sendBinary((ByteBuffer) result);
} else if (result instanceof byte[]) {
remoteEndpoint.sendBinary(ByteBuffer.wrap((byte[]) result));
} else {
remoteEndpoint.sendObject(result);
}
} catch (IOException | EncodeException ioe) {
throw new IllegalStateException(ioe);
}
}
/**
* Expose the POJO if it is a message handler so the Session is able to
* match requests to remove handlers if the original handler has been
* wrapped.
*/
@Override
public final MessageHandler getWrappedHandler() {
if (pojo instanceof MessageHandler) {
return (MessageHandler) pojo;
} else {
return null;
}
}
@Override
public final long getMaxMessageSize() {
return maxMessageSize;
}
protected final void handlePojoMethodException(Throwable t) {
t = ExceptionUtils.unwrapInvocationTargetException(t);
ExceptionUtils.handleThrowable(t);
if (t instanceof RuntimeException) {
throw (RuntimeException) t;
} else {
throw new RuntimeException(t.getMessage(), t);
}
}
}
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