/*
* 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.client;
import java.util.List;
import org.apache.openjpa.trader.client.event.ServiceEvent;
import org.apache.openjpa.trader.client.event.ServiceEventHandler.UpdateStockHandler;
import org.apache.openjpa.trader.client.ui.GridCellRenderer;
import org.apache.openjpa.trader.client.ui.ScrollableTable;
import org.apache.openjpa.trader.domain.Stock;
import com.google.gwt.user.client.Timer;
import com.google.gwt.user.client.rpc.AsyncCallback;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.Widget;
/**
* Displays the current Stock prices and updates periodically.
*
*
* @author Pinaki Poddar
*
*/
public class MarketDataPanel extends ScrollableTable<Stock> implements UpdateStockHandler {
private final OpenTrader session;
private Timer refreshTimer;
private static int refreshInterval = 60*1000;
public MarketDataPanel(final OpenTrader session, final int w, final int h) {
super("Market Prices (Updated every " + refreshInterval/1000 + "s)", w, h, true);
this.session = session;
session.registerHandler(ServiceEvent.StockUpdated.TYPE, this);
setColumnHeader(0, "Symbol", "25%");
setColumnHeader(1, "Price", "25%");
setColumnHeader(2, "Change", "50%");
// Stock Symbol
setRenderer(0, new GridCellRenderer<Stock>() {
public Widget render(Stock stock) {
return new Label(stock.getSymbol());
}
});
// Current Market Price
setRenderer(1, new GridCellRenderer<Stock>() {
public Widget render(Stock stock) {
return FormatUtil.formatPrice(stock.getMarketPrice());
}
});
// Percent Change since last update
setRenderer(2, new GridCellRenderer<Stock>() {
public Widget render(Stock stock) {
return FormatUtil.formatChange(stock.getMarketPrice(), stock.getLastPrice(), true);
}
});
}
/**
* Sets the interval to refresh the stock data from the server.
*
* @param interval period in milliseconds.
*/
public void setRefreshInterval(int interval) {
refreshInterval = interval;
setCaption("Market Prices (Updated every " + refreshInterval/1000 + "s)");
if (refreshTimer != null)
refreshTimer.scheduleRepeating(refreshInterval);
}
/**
* Gets the interval (in milliseconds) to refresh the stock data from the server.
*/
public int getRefreshInterval() {
return refreshInterval;
}
/**
* Starts a periodic update of the stocks from the server.
*/
public void startStockWatcher() {
if (refreshTimer != null)
return;
// Setup timer to refresh list automatically.
refreshTimer = new Timer() {
@Override
public void run() {
session.getService().getStocks(new UpdateStocks());
}
};
refreshTimer.run();
refreshTimer.scheduleRepeating(refreshInterval);
}
/**
* Starts periodic update of the stocks from the server.
*/
public void stopStockWatcher() {
if (refreshTimer == null)
return;
refreshTimer.cancel();
refreshTimer = null;
}
/**
* ---------------------------------------------------------------------------------
* Service Event Response Management
* ---------------------------------------------------------------------------------
*/
/**
* Updates the stock data.
*/
@Override
public void onStockUpdated(ServiceEvent.StockUpdated event) {
update(event.getPayload(), null);
}
/**
* ---------------------------------------------------------------------------------
* Asynchronous RPC service callbacks
* ---------------------------------------------------------------------------------
*/
/**
* Periodically update the stocks and notifies the listeners via the
* {@link OpenTrader#fireEvent(com.google.gwt.event.shared.GwtEvent) mediator}.
* In this case, one of the listeners is this widget itself. Still the
* {@link ServiceEvent.StockUpdated service event} is propagated via the
* mediator (so that others can listen as well).
*
*/
public class UpdateStocks implements AsyncCallback<List<Stock>> {
public void onFailure(Throwable caught) {
session.handleError(caught);
}
public void onSuccess(List<Stock> result) {
int n = result.size();
for (int i = 0; i < n; i++) {
session.fireEvent(new ServiceEvent.StockUpdated(result.get(i)));
}
}
}
}