twill-core/src/main/java/org/apache/twill/internal/SingleRunnableApplication.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.twill.internal;

import org.apache.twill.api.ResourceSpecification;
import org.apache.twill.api.TwillApplication;
import org.apache.twill.api.TwillRunnable;
import org.apache.twill.api.TwillRunnableSpecification;
import org.apache.twill.api.TwillSpecification;

/**
 * A simple {@link TwillApplication} that contains only one {@link TwillRunnable}.
 */
public class SingleRunnableApplication implements TwillApplication {

  private final TwillRunnable runnable;
  private final ResourceSpecification resourceSpec;

  public SingleRunnableApplication(TwillRunnable runnable, ResourceSpecification resourceSpec) {
    this.runnable = runnable;
    this.resourceSpec = resourceSpec;
  }

  @Override
  public TwillSpecification configure() {
    TwillRunnableSpecification runnableSpec = runnable.configure();
    return TwillSpecification.Builder.with()
      .setName(runnableSpec.getName())
      .withRunnable().add(runnableSpec.getName(), runnable, resourceSpec)
      .noLocalFiles()
      .anyOrder()
      .build();
  }
}