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Bridge between JVM and CLR.
There is a newer version: 0.16.0
/*
 * 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.javabridge;

import org.apache.reef.driver.evaluator.EvaluatorRequest;
import org.apache.reef.driver.evaluator.EvaluatorRequestor;
import org.apache.reef.util.logging.LoggingScope;
import org.apache.reef.util.logging.LoggingScopeFactory;

import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * The Java-CLR bridge object for {@link org.apache.reef.driver.evaluator.EvaluatorRequestor}.
 */
public final class EvaluatorRequestorBridge extends NativeBridge {
  private static final Logger LOG = Logger.getLogger(EvaluatorRequestorBridge.class.getName());
  private final boolean isBlocked;
  private final EvaluatorRequestor jevaluatorRequestor;
  private final LoggingScopeFactory loggingScopeFactory;

  // accumulate how many evaluators have been submitted through this instance
  // of EvaluatorRequestorBridge
  private int clrEvaluatorsNumber;

  public EvaluatorRequestorBridge(final EvaluatorRequestor evaluatorRequestor,
                                  final boolean isBlocked,
                                  final LoggingScopeFactory loggingScopeFactory) {
    this.jevaluatorRequestor = evaluatorRequestor;
    this.clrEvaluatorsNumber = 0;
    this.isBlocked = isBlocked;
    this.loggingScopeFactory = loggingScopeFactory;
  }

  public void submit(final int evaluatorsNumber, final int memory, final int virtualCore, final String rack) {
    if (this.isBlocked) {
      throw new RuntimeException("Cannot request additional Evaluator, this is probably because " +
          "the Driver has crashed and restarted, and cannot ask for new container due to YARN-2433.");
    }

    if (rack != null && !rack.isEmpty()) {
      LOG.log(Level.WARNING, "Ignoring rack preference.");
    }

    try (final LoggingScope ls = loggingScopeFactory.evaluatorRequestSubmitToJavaDriver(evaluatorsNumber)) {
      clrEvaluatorsNumber += evaluatorsNumber;

      final EvaluatorRequest request = EvaluatorRequest.newBuilder()
          .setNumber(evaluatorsNumber)
          .setMemory(memory)
          .setNumberOfCores(virtualCore)
          .build();

      LOG.log(Level.FINE, "submitting evaluator request {0}", request);
      jevaluatorRequestor.submit(request);
    }
  }

  public int getEvaluatorNumber() {
    return clrEvaluatorsNumber;
  }

  @Override
  public void close() {
  }
}