/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package async;
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import java.text.DecimalFormat;
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import java.util.List;
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import java.util.Random;
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import java.util.concurrent.CopyOnWriteArrayList;
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import java.util.concurrent.atomic.AtomicInteger;
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public class Stockticker implements Runnable {
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public volatile boolean run = true;
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protected final AtomicInteger counter = new AtomicInteger(0);
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final List<TickListener> listeners = new CopyOnWriteArrayList<>();
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protected volatile Thread ticker = null;
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protected volatile int ticknr = 0;
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public synchronized void start() {
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run = true;
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ticker = new Thread(this);
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ticker.setName("Ticker Thread");
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ticker.start();
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}
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public synchronized void stop() {
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// On context stop this can be called multiple times.
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// NO-OP is the ticker thread is not set
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// (i.e. stop() has already completed)
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if (ticker == null) {
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return;
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}
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run = false;
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try {
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ticker.join();
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}catch (InterruptedException x) {
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Thread.interrupted();
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}
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ticker = null;
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}
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public void shutdown() {
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// Notify each listener of the shutdown. This enables them to
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// trigger any necessary clean-up.
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for (TickListener l : listeners) {
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l.shutdown();
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}
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// Wait for the thread to stop. This prevents warnings in the logs
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// that the thread is still active when the context stops.
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stop();
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}
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public void addTickListener(TickListener listener) {
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if (listeners.add(listener)) {
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if (counter.incrementAndGet()==1) {
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start();
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}
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}
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}
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public void removeTickListener(TickListener listener) {
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if (listeners.remove(listener)) {
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if (counter.decrementAndGet()==0) {
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stop();
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}
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}
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}
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@Override
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public void run() {
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try {
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Stock[] stocks = new Stock[] { new Stock("GOOG", 435.43),
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new Stock("YHOO", 27.88), new Stock("ASF", 1015.55), };
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Random r = new Random(System.currentTimeMillis());
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while (run) {
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for (int j = 0; j < 1; j++) {
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int i = r.nextInt() % 3;
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if (i < 0) {
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i = i * (-1);
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}
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Stock stock = stocks[i];
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double change = r.nextDouble();
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boolean plus = r.nextBoolean();
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if (plus) {
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stock.setValue(stock.getValue() + change);
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} else {
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stock.setValue(stock.getValue() - change);
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}
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stock.setCnt(++ticknr);
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for (TickListener l : listeners) {
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l.tick(stock);
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}
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}
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Thread.sleep(850);
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}
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} catch (InterruptedException ix) {
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// Ignore
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} catch (Exception x) {
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x.printStackTrace();
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}
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}
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public static interface TickListener {
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public void tick(Stock stock);
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public void shutdown();
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}
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public static final class Stock implements Cloneable {
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protected static final DecimalFormat df = new DecimalFormat("0.00");
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protected final String symbol;
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protected double value = 0.0d;
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protected double lastchange = 0.0d;
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protected int cnt = 0;
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public Stock(String symbol, double initvalue) {
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this.symbol = symbol;
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this.value = initvalue;
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}
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public void setCnt(int c) {
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this.cnt = c;
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}
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public int getCnt() {
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return cnt;
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}
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public String getSymbol() {
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return symbol;
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}
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public double getValue() {
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return value;
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}
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public void setValue(double value) {
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double old = this.value;
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this.value = value;
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this.lastchange = value - old;
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}
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public String getValueAsString() {
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return df.format(value);
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}
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public double getLastChange() {
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return this.lastchange;
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}
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public void setLastChange(double lastchange) {
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this.lastchange = lastchange;
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}
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public String getLastChangeAsString() {
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return df.format(lastchange);
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}
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@Override
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public int hashCode() {
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return symbol.hashCode();
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}
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@Override
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public boolean equals(Object other) {
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if (other instanceof Stock) {
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return this.symbol.equals(((Stock) other).symbol);
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}
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return false;
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}
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@Override
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public String toString() {
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StringBuilder buf = new StringBuilder("STOCK#");
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buf.append(getSymbol());
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buf.append('#');
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buf.append(getValueAsString());
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buf.append('#');
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buf.append(getLastChangeAsString());
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buf.append('#');
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buf.append(String.valueOf(getCnt()));
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return buf.toString();
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}
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@Override
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public Object clone() {
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Stock s = new Stock(this.getSymbol(), this.getValue());
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s.setLastChange(this.getLastChange());
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s.setCnt(this.cnt);
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return s;
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}
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}
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}
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