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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.InvocationTargetException;
import java.util.Map;
import java.util.Set;
import javax.websocket.CloseReason;
import javax.websocket.Endpoint;
import javax.websocket.EndpointConfig;
import javax.websocket.MessageHandler;
import javax.websocket.Session;
import org.apache.juli.logging.Log;
import org.apache.juli.logging.LogFactory;
import org.apache.tomcat.util.ExceptionUtils;
import org.apache.tomcat.util.res.StringManager;
/**
* Base implementation (client and server have different concrete
* implementations) of the wrapper that converts a POJO instance into a
* WebSocket endpoint instance.
*/
public abstract class PojoEndpointBase extends Endpoint {
private final Log log = LogFactory.getLog(PojoEndpointBase.class); // must not be static
private static final StringManager sm = StringManager.getManager(PojoEndpointBase.class);
private Object pojo;
private Map<String,String> pathParameters;
private PojoMethodMapping methodMapping;
protected final void doOnOpen(Session session, EndpointConfig config) {
PojoMethodMapping methodMapping = getMethodMapping();
Object pojo = getPojo();
Map<String,String> pathParameters = getPathParameters();
// Add message handlers before calling onOpen since that may trigger a
// message which in turn could trigger a response and/or close the
// session
for (MessageHandler mh : methodMapping.getMessageHandlers(pojo,
pathParameters, session, config)) {
session.addMessageHandler(mh);
}
if (methodMapping.getOnOpen() != null) {
try {
methodMapping.getOnOpen().invoke(pojo,
methodMapping.getOnOpenArgs(
pathParameters, session, config));
} catch (IllegalAccessException e) {
// Reflection related problems
log.error(sm.getString(
"pojoEndpointBase.onOpenFail",
pojo.getClass().getName()), e);
handleOnOpenOrCloseError(session, e);
} catch (InvocationTargetException e) {
Throwable cause = e.getCause();
handleOnOpenOrCloseError(session, cause);
} catch (Throwable t) {
handleOnOpenOrCloseError(session, t);
}
}
}
private void handleOnOpenOrCloseError(Session session, Throwable t) {
// If really fatal - re-throw
ExceptionUtils.handleThrowable(t);
// Trigger the error handler and close the session
onError(session, t);
try {
session.close();
} catch (IOException ioe) {
log.warn(sm.getString("pojoEndpointBase.closeSessionFail"), ioe);
}
}
@Override
public final void onClose(Session session, CloseReason closeReason) {
if (methodMapping.getOnClose() != null) {
try {
methodMapping.getOnClose().invoke(pojo,
methodMapping.getOnCloseArgs(pathParameters, session, closeReason));
} catch (Throwable t) {
log.error(sm.getString("pojoEndpointBase.onCloseFail",
pojo.getClass().getName()), t);
handleOnOpenOrCloseError(session, t);
}
}
// Trigger the destroy method for any associated decoders
Set<MessageHandler> messageHandlers = session.getMessageHandlers();
for (MessageHandler messageHandler : messageHandlers) {
if (messageHandler instanceof PojoMessageHandlerWholeBase<?>) {
((PojoMessageHandlerWholeBase<?>) messageHandler).onClose();
}
}
}
@Override
public final void onError(Session session, Throwable throwable) {
if (methodMapping.getOnError() == null) {
log.error(sm.getString("pojoEndpointBase.onError",
pojo.getClass().getName()), throwable);
} else {
try {
methodMapping.getOnError().invoke(
pojo,
methodMapping.getOnErrorArgs(pathParameters, session,
throwable));
} catch (Throwable t) {
ExceptionUtils.handleThrowable(t);
log.error(sm.getString("pojoEndpointBase.onErrorFail",
pojo.getClass().getName()), t);
}
}
}
protected Object getPojo() { return pojo; }
protected void setPojo(Object pojo) { this.pojo = pojo; }
protected Map<String,String> getPathParameters() { return pathParameters; }
protected void setPathParameters(Map<String,String> pathParameters) {
this.pathParameters = pathParameters;
}
protected PojoMethodMapping getMethodMapping() { return methodMapping; }
protected void setMethodMapping(PojoMethodMapping methodMapping) {
this.methodMapping = methodMapping;
}
}
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