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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 async;
import java.text.DecimalFormat;
import java.util.List;
import java.util.Random;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.atomic.AtomicInteger;
public class Stockticker implements Runnable {
public volatile boolean run = true;
protected final AtomicInteger counter = new AtomicInteger(0);
final List<TickListener> listeners = new CopyOnWriteArrayList<>();
protected volatile Thread ticker = null;
protected volatile int ticknr = 0;
public synchronized void start() {
run = true;
ticker = new Thread(this);
ticker.setName("Ticker Thread");
ticker.start();
}
public synchronized void stop() {
// On context stop this can be called multiple times.
// NO-OP is the ticker thread is not set
// (i.e. stop() has already completed)
if (ticker == null) {
return;
}
run = false;
try {
ticker.join();
}catch (InterruptedException x) {
Thread.interrupted();
}
ticker = null;
}
public void shutdown() {
// Notify each listener of the shutdown. This enables them to
// trigger any necessary clean-up.
for (TickListener l : listeners) {
l.shutdown();
}
// Wait for the thread to stop. This prevents warnings in the logs
// that the thread is still active when the context stops.
stop();
}
public void addTickListener(TickListener listener) {
if (listeners.add(listener)) {
if (counter.incrementAndGet()==1) {
start();
}
}
}
public void removeTickListener(TickListener listener) {
if (listeners.remove(listener)) {
if (counter.decrementAndGet()==0) {
stop();
}
}
}
@Override
public void run() {
try {
Stock[] stocks = new Stock[] { new Stock("GOOG", 435.43),
new Stock("YHOO", 27.88), new Stock("ASF", 1015.55), };
Random r = new Random(System.currentTimeMillis());
while (run) {
for (int j = 0; j < 1; j++) {
int i = r.nextInt() % 3;
if (i < 0) {
i = i * (-1);
}
Stock stock = stocks[i];
double change = r.nextDouble();
boolean plus = r.nextBoolean();
if (plus) {
stock.setValue(stock.getValue() + change);
} else {
stock.setValue(stock.getValue() - change);
}
stock.setCnt(++ticknr);
for (TickListener l : listeners) {
l.tick(stock);
}
}
Thread.sleep(850);
}
} catch (InterruptedException ix) {
// Ignore
} catch (Exception x) {
x.printStackTrace();
}
}
public interface TickListener {
void tick(Stock stock);
void shutdown();
}
public static final class Stock implements Cloneable {
protected static final DecimalFormat df = new DecimalFormat("0.00");
protected final String symbol;
protected double value = 0.0d;
protected double lastchange = 0.0d;
protected int cnt = 0;
public Stock(String symbol, double initvalue) {
this.symbol = symbol;
this.value = initvalue;
}
public void setCnt(int c) {
this.cnt = c;
}
public int getCnt() {
return cnt;
}
public String getSymbol() {
return symbol;
}
public double getValue() {
return value;
}
public void setValue(double value) {
double old = this.value;
this.value = value;
this.lastchange = value - old;
}
public String getValueAsString() {
return df.format(value);
}
public double getLastChange() {
return this.lastchange;
}
public void setLastChange(double lastchange) {
this.lastchange = lastchange;
}
public String getLastChangeAsString() {
return df.format(lastchange);
}
@Override
public int hashCode() {
return symbol.hashCode();
}
@Override
public boolean equals(Object other) {
if (other instanceof Stock) {
return this.symbol.equals(((Stock) other).symbol);
}
return false;
}
@Override
public String toString() {
StringBuilder buf = new StringBuilder("STOCK#");
buf.append(getSymbol());
buf.append('#');
buf.append(getValueAsString());
buf.append('#');
buf.append(getLastChangeAsString());
buf.append('#');
buf.append(String.valueOf(getCnt()));
return buf.toString();
}
@Override
public Object clone() {
Stock s = new Stock(this.getSymbol(), this.getValue());
s.setLastChange(this.getLastChange());
s.setCnt(this.cnt);
return s;
}
}
}
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