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package com.orbekk.protobuf;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.PriorityQueue;
import java.io.Closeable;
import java.io.IOException;
public class TimeoutManager extends Thread {
private static final Logger logger =
Logger.getLogger(TimeoutManager.class.getName());
private Environment environment;
private PriorityQueue<Entry> entries = new PriorityQueue<Entry>();
private static class Entry implements Comparable<Entry> {
// May not be null.
public Long timeout;
public Closeable closeable;
public Entry(long timeout, Closeable closeable) {
this.timeout = timeout;
this.closeable = closeable;
}
public void close() throws IOException {
closeable.close();
}
@Override public int compareTo(Entry other) {
return timeout.compareTo(other.timeout);
}
}
public interface Environment {
long currentTimeMillis();
void sleep(long millis) throws InterruptedException;
}
public static class DefaultEnvironment implements Environment {
@Override public long currentTimeMillis() {
return System.currentTimeMillis();
}
@Override public void sleep(long millis) throws InterruptedException {
Thread.sleep(millis);
}
}
TimeoutManager(Environment environment) {
this.environment = environment;
}
public TimeoutManager() {
this(new DefaultEnvironment());
}
public synchronized void performWork() {
try {
if (entries.isEmpty()) {
wait();
} else {
long sleepTime = entries.peek().timeout -
environment.currentTimeMillis();
if (sleepTime > 0) {
wait(sleepTime);
}
}
closeExpiredEntries();
} catch (InterruptedException e) {
// Handled by outer loop.
}
}
@Override public void run() {
while (!Thread.interrupted()) {
performWork();
}
}
public synchronized void closeExpiredEntries() {
long currentTime = environment.currentTimeMillis();
while (!entries.isEmpty() && entries.peek().timeout <= currentTime) {
try {
entries.poll().close();
} catch (IOException e) {
logger.log(Level.INFO, "Could not close entry. ", e);
}
}
}
public synchronized void addEntry(long timeoutTime, Closeable closeable) {
if (entries.isEmpty() || timeoutTime <= entries.peek().timeout) {
notify();
}
entries.add(new Entry(timeoutTime, closeable));
}
}
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