lang/java/reef-common/src/main/java/org/apache/reef/runtime/common/driver/evaluator/EvaluatorResourceManagerErrorHandler.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.reef.runtime.common.driver.evaluator;

import org.apache.reef.annotations.audience.Private;
import org.apache.reef.client.FailedRuntime;
import org.apache.reef.exception.EvaluatorException;
import org.apache.reef.proto.ReefServiceProtos;
import org.apache.reef.util.Optional;
import org.apache.reef.wake.EventHandler;
import org.apache.reef.wake.remote.RemoteMessage;

import javax.inject.Inject;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * The error handler receives all resourcemanager errors from all evaluators in the system.
 * Its primary function is to dispatch these to the appropriate EvaluatorManager.
 */
@Private
public final class EvaluatorResourceManagerErrorHandler
    implements EventHandler<RemoteMessage<ReefServiceProtos.RuntimeErrorProto>> {
  private static final Logger LOG = Logger.getLogger(EvaluatorResourceManagerErrorHandler.class.toString());
  private final Evaluators evaluators;


  @Inject
  EvaluatorResourceManagerErrorHandler(final Evaluators evaluators) {
    this.evaluators = evaluators;
    LOG.log(Level.FINE, "Instantiated 'EvaluatorResourceManagerErrorHandler'");
  }

  @Override
  public void onNext(final RemoteMessage<ReefServiceProtos.RuntimeErrorProto> runtimeErrorProtoRemoteMessage) {
    final ReefServiceProtos.RuntimeErrorProto runtimeErrorProto = runtimeErrorProtoRemoteMessage.getMessage();
    final FailedRuntime error = new FailedRuntime(runtimeErrorProto);
    final String evaluatorId = error.getId();
    LOG.log(Level.WARNING, "Runtime error: " + error);

    final EvaluatorException evaluatorException = error.getReason().isPresent() ?
        new EvaluatorException(evaluatorId, error.getReason().get()) :
        new EvaluatorException(evaluatorId, "Runtime error");

    final Optional<EvaluatorManager> evaluatorManager = this.evaluators.get(evaluatorId);
    if (evaluatorManager.isPresent()) {
      evaluatorManager.get().onEvaluatorException(evaluatorException);
    } else {
      if (this.evaluators.wasClosed(evaluatorId)) {
        LOG.log(Level.WARNING, "Evaluator [" + evaluatorId + "] has raised exception after it was closed.");
      } else {
        LOG.log(Level.WARNING, "Unknown evaluator runtime error: " + error);
      }
    }
  }
}