/*
 * Copyright 2000-2012 JetBrains s.r.o.
 *
 * Licensed 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 jetbrains.buildServer.agent.android;

import java.util.concurrent.*;
import jetbrains.buildServer.RunBuildException;
import jetbrains.buildServer.agent.BuildFinishedStatus;
import jetbrains.buildServer.agent.BuildProcess;
import org.apache.log4j.Logger;
import org.jetbrains.annotations.NotNull;

abstract class FutureBasedBuildProcess implements BuildProcess, Callable<BuildFinishedStatus> {
  @NotNull private static final Logger LOG = Logger.getLogger(FutureBasedBuildProcess.class);
  private Future<BuildFinishedStatus> myFuture;

  public void start() throws RunBuildException {
    try {
      myFuture = Executors.newSingleThreadExecutor().submit(this);
      LOG.info("Build process started");
    } catch (final RejectedExecutionException e) {
      LOG.error("Build process failed to start", e);
      throw new RunBuildException(e);
    }
  }

  public boolean isInterrupted() {
    return myFuture.isCancelled() && isFinished();
  }

  public boolean isFinished() {
    return myFuture.isDone();
  }

  public void interrupt() {
    LOG.info("Attempt to interrupt build process");
    myFuture.cancel(true);
  }

  @NotNull
  public BuildFinishedStatus waitFor() throws RunBuildException {
    try {
      final BuildFinishedStatus status = myFuture.get();
      LOG.info("Build process was finished");
      return status;
    } catch (final InterruptedException e) {
      throw new RunBuildException(e);
    } catch (final ExecutionException e) {
      throw new RunBuildException(e);
    } catch (final CancellationException e) {
      LOG.info("Build process was interrupted", e);
      return BuildFinishedStatus.INTERRUPTED;
    }
  }
}