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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.processing.response;
import com.yahoo.processing.Request;
import com.yahoo.processing.Response;
import com.yahoo.processing.execution.Execution;
import com.yahoo.processing.request.ErrorMessage;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.concurrent.FutureTask;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* A processing response which will arrive in the future.
*
* @author bratseth
*/
public class FutureResponse implements Future<Response> {
private final Request request;
private final FutureTask<Response> task;
/**
* Only used for generating messages
*/
private final Execution execution;
private final static Logger log = Logger.getLogger(FutureResponse.class.getName());
public FutureResponse(final Callable<Response> callable, Execution execution, final Request request) {
this.task = new FutureTask<>(callable);
this.request = request;
this.execution = execution;
}
public FutureTask<Response> delegate() { return task; }
@Override public boolean cancel(boolean mayInterruptIfRunning) { return task.cancel(mayInterruptIfRunning); }
@Override public boolean isCancelled() { return task.isCancelled(); }
@Override public boolean isDone() { return task.isDone(); }
public
@Override
Response get() {
try {
return task.get();
} catch (InterruptedException e) {
return new Response(request, new ErrorMessage("'" + execution + "' was interrupted", e));
} catch (ExecutionException e) {
log.log(Level.WARNING, "Exception on executing " + execution + " for " + request, e);
return new Response(request, new ErrorMessage("Error in '" + execution + "'", e));
}
}
public
@Override
Response get(long timeout, TimeUnit timeunit) {
try {
return task.get(timeout, timeunit);
} catch (InterruptedException e) {
return new Response(request, new ErrorMessage("'" + execution + "' was interrupted", e));
} catch (ExecutionException e) {
log.log(Level.WARNING, "Exception on executing " + execution + " for " + request, e);
return new Response(request, new ErrorMessage("Error in '" + execution + "'", e));
} catch (TimeoutException e) {
return new Response(request, new ErrorMessage("Error executing '" + execution + "': " + " Chain timed out."));
}
}
/**
* Returns the query used in this execution, never null
*/
public Request getRequest() {
return request;
}
}
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