/*
* 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 org.apache.openjpa.trader.server;
import java.sql.Timestamp;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import org.apache.openjpa.trader.client.TradingServiceAdapter;
import org.apache.openjpa.trader.domain.Ask;
import org.apache.openjpa.trader.domain.Bid;
import org.apache.openjpa.trader.domain.LogStatement;
import org.apache.openjpa.trader.domain.Match;
import org.apache.openjpa.trader.domain.Stock;
import org.apache.openjpa.trader.domain.Tradable;
import org.apache.openjpa.trader.domain.Trade;
import org.apache.openjpa.trader.domain.Trader;
import org.apache.openjpa.trader.service.Exchange;
import org.apache.openjpa.trader.service.MockTradingService;
import org.apache.openjpa.trader.service.TradingService;
import com.google.gwt.user.server.rpc.RemoteServiceServlet;
/**
* The server side implementation of the GWT RPC service.
* <p>
* This implementation delegates to original implementation, thereby blocking the GWT Servlet
* dependency to the original implementation of the service. This implementation being a
* servlet allows us to switch the delegate during {@#init(ServletConfig) initialization}
* to either a {@link Exchange real JPA-based } implementation or a {@link MockTradingService simple in-memory}
* implementation of the {@link TradingService service interface}.
* <p>
* The other important advantage of such delegation is to translate exception. The underlying service
* exceptions are translated by an {@link ExceptionAdapter exception translator} that ensures that
* the translated exceptions are serializable and hence accessible to the browser-based client.
*
* @author Pinaki Poddar
*/
@SuppressWarnings("serial")
public class TradingServiceAdapterImpl extends RemoteServiceServlet implements TradingServiceAdapter {
private TradingService _del;
private ExceptionAdapter _translator = new ExceptionAdapter();
public void init(ServletConfig config) throws ServletException {
super.init(config);
String unit = config.getInitParameter("persistence.unit");
String mock = config.getInitParameter("mock");
String serverTrace = config.getInitParameter("server-side-stacktrace");
_del = ("true".equalsIgnoreCase(mock)) ? new MockTradingService() : new Exchange(unit);
_translator.setPrintServerSideStackTrace("true".equalsIgnoreCase(serverTrace));
}
public void destroy() {
_del.close();
super.destroy();
}
public Ask ask(Trader trader, Stock stock, int volume, double price) {
try {
return _del.ask(trader, stock, volume, price);
} catch (Throwable e) {
throw translate(e);
}
}
public Bid bid(Trader trader, Stock stock, int volume, double price) {
try {
return _del.bid(trader, stock, volume, price);
} catch (Throwable e) {
throw translate(e);
}
}
public Tradable withdraw(Tradable t) {
try {
return _del.withdraw(t);
} catch (Throwable e) {
throw translate(e);
}
}
public Tradable refresh(Tradable t) {
try {
return _del.refresh(t);
} catch (Throwable e) {
throw translate(e);
}
}
public Stock getStock(String symbol) {
try {
return _del.getStock(symbol);
} catch (Throwable e) {
throw translate(e);
}
}
public List<Stock> getStocks() {
try {
return new ArrayList<Stock>(_del.getStocks());
} catch (Throwable e) {
throw translate(e);
}
}
public List<Trade> getTrades(Timestamp from, Timestamp to) {
try {
return _del.getTrades(from, to);
} catch (Throwable e) {
throw translate(e);
}
}
public List<Trade> getTrades(Trader trader, Boolean boughtOrsold, Timestamp from, Timestamp to) {
try {
return _del.getTrades(trader, boughtOrsold, from, to);
} catch (Throwable e) {
throw translate(e);
}
}
public Trader login(String trader) throws RuntimeException {
try {
return _del.login(trader);
} catch (Throwable e) {
throw translate(e);
}
}
public List<Match> matchAsk(Ask ask) {
try {
return new ArrayList<Match>(_del.matchAsk(ask));
} catch (Throwable e) {
throw translate(e);
}
}
public List<Match> matchBid(Bid bid) {
try {
return new ArrayList<Match>(_del.matchBid(bid));
} catch (Throwable e) {
throw translate(e);
}
}
public Trade trade(Match match) {
try {
return _del.trade(match);
} catch (Throwable e) {
throw translate(e);
}
}
@Override
public List<LogStatement> getLog() {
try {
return _del.getLog();
} catch (Throwable e) {
throw translate(e);
}
}
public String getServiceURI() {
try {
return _del.getServiceURI();
} catch (Throwable e) {
throw translate(e);
}
}
RuntimeException translate(Throwable t) {
return _translator.translate(t);
}
}