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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.clustercontroller.utils.communication.http;
import com.yahoo.vespa.clustercontroller.utils.communication.async.AsyncCallback;
import com.yahoo.vespa.clustercontroller.utils.communication.async.AsyncOperation;
import com.yahoo.vespa.clustercontroller.utils.communication.async.AsyncOperationImpl;
import com.yahoo.vespa.clustercontroller.utils.util.Clock;
import java.util.*;
import java.util.concurrent.Executor;
import java.util.concurrent.TimeoutException;
import java.util.logging.Logger;
public class TimeoutHandler<V extends HttpResult> extends AsyncHttpClientWithBase<V> {
public static class InternalRequest<V extends HttpResult> extends AsyncOperationImpl<V> {
final AsyncOperation<V> operation;
long startTime;
long timeout;
public InternalRequest(AsyncOperation<V> op, long startTime, long timeout) {
super(op.getName(), op.getDescription());
this.operation = op;
this.startTime = startTime;
this.timeout = timeout;
op.register(new AsyncCallback<V>() {
@Override
public void done(AsyncOperation<V> op) {
if (!isDone()) {
if (op.isSuccess()) {
setResult(op.getResult());
} else {
setFailure(op.getCause(), op.getResult());
}
}
}
});
}
public long getTimeoutTime() { return startTime + timeout; }
public void handleTimeout(long currentTime) {
long timePassed = currentTime - startTime;
this.setFailure(new TimeoutException("Operation timeout. " + timePassed + " ms since operation was issued. Timeout was " + timeout + " ms."));
operation.cancel();
}
@Override
public boolean cancel() { return operation.cancel(); }
@Override
public boolean isCanceled() { return operation.isCanceled(); }
@Override
public Double getProgress() { return (isDone() ? Double.valueOf(1.0) : operation.getProgress()); }
}
public static class ChangeLogger {
private InternalRequest lastTimeoutLogged = null;
private boolean emptyLogged = true;
public void logChanges(TreeMap<Long, InternalRequest> requests) {
if (requests.isEmpty()) {
if (!emptyLogged) {
log.finest("No more pending requests currently.");
emptyLogged = true;
}
} else {
emptyLogged = false;
InternalRequest r = requests.firstEntry().getValue();
if (lastTimeoutLogged == null || !lastTimeoutLogged.equals(r)) {
lastTimeoutLogged = r;
log.finest("Next operation to possibly timeout will do so at " + r.getTimeoutTime());
}
}
}
}
private final static Logger log = Logger.getLogger(TimeoutHandler.class.getName());
private final TreeMap<Long, InternalRequest> requests = new TreeMap<>();
private final ChangeLogger changeLogger = new ChangeLogger();
private final Clock clock;
private boolean run = true;
private Runnable timeoutHandler = new Runnable() {
@Override
public void run() {
log.fine("Starting timeout monitor thread");
while (true) {
performTimeoutHandlerTick();
synchronized (clock) {
try{ clock.wait(100); } catch (InterruptedException e) {}
if (!run) break;
}
}
log.fine("Stopped timeout monitor thread");
}
};
public TimeoutHandler(Executor executor, Clock clock, AsyncHttpClient<V> client) {
super(client);
this.clock = clock;
executor.execute(timeoutHandler);
}
@Override
public void close() {
synchronized (clock) {
run = false;
clock.notifyAll();
}
synchronized (requests) {
for (InternalRequest r : requests.values()) {
r.operation.cancel();
r.setFailure(new TimeoutException("Timeout handler shutting down. Shutting down all requests monitored."));
}
requests.clear();
}
}
@Override
public AsyncOperation<V> execute(HttpRequest r) {
AsyncOperation<V> op = super.execute(r);
InternalRequest<V> request = new InternalRequest<>(op, clock.getTimeInMillis(), r.getTimeoutMillis());
synchronized (requests) {
requests.put(request.getTimeoutTime(), request);
}
return request;
}
void performTimeoutHandlerTick() {
synchronized (requests) {
removeCompletedRequestsFromTimeoutList();
handleTimeoutsAtTime(clock.getTimeInMillis());
changeLogger.logChanges(requests);
}
}
private void removeCompletedRequestsFromTimeoutList() {
while (!requests.isEmpty() && requests.firstEntry().getValue().operation.isDone()) {
requests.remove(requests.firstEntry().getKey());
log.finest("Removed completed request from operation timeout list.");
}
}
private void handleTimeoutsAtTime(long currentTime) {
Map<Long, InternalRequest> timeouts = requests.subMap(0l, currentTime + 1);
for (InternalRequest r : timeouts.values()) {
r.handleTimeout(currentTime);
requests.values().remove(r);
}
}
}
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