/*
* @(#)$Id: XQEngineServer.java 3619 2008-03-26 07:23:03Z yui $
*
* Copyright 2006-2008 Makoto YUI
*
* Licensed 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.
*
* Contributors:
* Makoto YUI - initial implementation
*/
package xbird.engine;
import java.io.Serializable;
import java.rmi.RemoteException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import xbird.config.Settings;
/**
* The frontend engine server for various requests to database server.
* <DIV lang="en">
* Caution: <br/>
* When polling with the new <code>Request</code> object, ensure that
* enought interval of method call between {@link #execute(Request)} and {@link #poll(Request)}
* is promised.
* </DIV>
* <DIV lang="ja"></DIV>
*
* @author Makoto YUI (yuin405+xbird@gmail.com)
*/
public final class XQEngineServer extends RemoteBase implements XQEngine {
private static final long serialVersionUID = 5410190251826182651L;
private static final Log LOG = LogFactory.getLog(XQEngineServer.class);
public static final String bindName = Settings.get("xbird.rmi.engine.name");
private static final int exportPort = Integer.parseInt(Settings.get("xbird.rmi.engine.port", "0"));
private final RequestManager requestManager;
public XQEngineServer() {
super(bindName, exportPort);
this.requestManager = new RequestManager();
}
public StampedResult execute(Request request) throws RemoteException {
if(LOG.isDebugEnabled()) {
final long latency = System.currentTimeMillis() - request.getInvoked();
LOG.debug("Latency of the request `" + request + "': "
+ (latency < 0 ? "N/A" : (latency + "(msec)")));
}
final Serializable result = requestManager.dispatchRequest(request);
return new StampedResult(result);
}
@Deprecated
public Object execute(Request request, ResultHandler handler) throws RemoteException {
if(handler != null) {
request.setResultHandler(handler);
}
return execute(request);
}
public Object poll(Request request) throws RemoteException {
return requestManager.pollRequest(request);
}
public void shutdown() throws RemoteException {
shutdown(false);
}
}