/**
 * 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.hadoop.yarn.api.records;

import org.apache.hadoop.classification.InterfaceAudience.Public;
import org.apache.hadoop.classification.InterfaceStability.Stable;
import org.apache.hadoop.classification.InterfaceStability.Unstable;
import org.apache.hadoop.yarn.api.ContainerManagementProtocol;
import org.apache.hadoop.yarn.util.Records;

/**
 * <p><code>LocalResource</code> represents a local resource required to
 * run a container.</p>
 * 
 * <p>The <code>NodeManager</code> is responsible for localizing the resource 
 * prior to launching the container.</p>
 * 
 * <p>Applications can specify {@link LocalResourceType} and 
 * {@link LocalResourceVisibility}.</p>
 * 
 * @see LocalResourceType
 * @see LocalResourceVisibility
 * @see ContainerLaunchContext
 * @see ApplicationSubmissionContext
 * @see ContainerManagementProtocol#startContainers(org.apache.hadoop.yarn.api.protocolrecords.StartContainersRequest)
 */
@Public
@Stable
public abstract class LocalResource {

  @Public
  @Stable
  public static LocalResource newInstance(URL url, LocalResourceType type,
      LocalResourceVisibility visibility, long size, long timestamp,
      String pattern) {
    return newInstance(url, type, visibility, size, timestamp, pattern, false);
  }

  @Public
  @Unstable
  public static LocalResource newInstance(URL url, LocalResourceType type,
      LocalResourceVisibility visibility, long size, long timestamp,
      String pattern, boolean shouldBeUploadedToSharedCache) {
    LocalResource resource = Records.newRecord(LocalResource.class);
    resource.setResource(url);
    resource.setType(type);
    resource.setVisibility(visibility);
    resource.setSize(size);
    resource.setTimestamp(timestamp);
    resource.setPattern(pattern);
    resource.setShouldBeUploadedToSharedCache(shouldBeUploadedToSharedCache);
    return resource;
  }

  @Public
  @Stable
  public static LocalResource newInstance(URL url, LocalResourceType type,
      LocalResourceVisibility visibility, long size, long timestamp) {
    return newInstance(url, type, visibility, size, timestamp, null);
  }

  @Public
  @Unstable
  public static LocalResource newInstance(URL url, LocalResourceType type,
      LocalResourceVisibility visibility, long size, long timestamp,
      boolean shouldBeUploadedToSharedCache) {
    return newInstance(url, type, visibility, size, timestamp, null,
        shouldBeUploadedToSharedCache);
  }

  /**
   * Get the <em>location</em> of the resource to be localized.
   * @return <em>location</em> of the resource to be localized
   */
  @Public
  @Stable
  public abstract URL getResource();
  
  /**
   * Set <em>location</em> of the resource to be localized.
   * @param resource <em>location</em> of the resource to be localized
   */
  @Public
  @Stable
  public abstract void setResource(URL resource);
  
  /**
   * Get the <em>size</em> of the resource to be localized.
   * @return <em>size</em> of the resource to be localized
   */
  @Public
  @Stable
  public abstract long getSize();
  
  /**
   * Set the <em>size</em> of the resource to be localized.
   * @param size <em>size</em> of the resource to be localized
   */
  @Public
  @Stable
  public abstract void setSize(long size);
  
  /**
   * Get the original <em>timestamp</em> of the resource to be localized, used
   * for verification.
   * @return <em>timestamp</em> of the resource to be localized
   */
  @Public
  @Stable
  public abstract long getTimestamp();
  
  /**
   * Set the <em>timestamp</em> of the resource to be localized, used
   * for verification.
   * @param timestamp <em>timestamp</em> of the resource to be localized
   */
  @Public
  @Stable
  public abstract void setTimestamp(long timestamp);
  
  /**
   * Get the <code>LocalResourceType</code> of the resource to be localized.
   * @return <code>LocalResourceType</code> of the resource to be localized
   */
  @Public
  @Stable
  public abstract LocalResourceType getType();
  
  /**
   * Set the <code>LocalResourceType</code> of the resource to be localized.
   * @param type <code>LocalResourceType</code> of the resource to be localized
   */
  @Public
  @Stable
  public abstract void setType(LocalResourceType type);
  
  /**
   * Get the <code>LocalResourceVisibility</code> of the resource to be 
   * localized.
   * @return <code>LocalResourceVisibility</code> of the resource to be 
   *         localized
   */
  @Public
  @Stable
  public abstract LocalResourceVisibility getVisibility();
  
  /**
   * Set the <code>LocalResourceVisibility</code> of the resource to be 
   * localized.
   * @param visibility <code>LocalResourceVisibility</code> of the resource to be 
   *                   localized
   */
  @Public
  @Stable
  public abstract void setVisibility(LocalResourceVisibility visibility);
  
  /**
   * Get the <em>pattern</em> that should be used to extract entries from the
   * archive (only used when type is <code>PATTERN</code>).
   * @return <em>pattern</em> that should be used to extract entries from the 
   * archive. 
   */
  @Public
  @Stable
  public abstract String getPattern();
  
  /**
   * Set the <em>pattern</em> that should be used to extract entries from the
   * archive (only used when type is <code>PATTERN</code>).
   * @param pattern <em>pattern</em> that should be used to extract entries 
   * from the archive.
   */
  @Public
  @Stable
  public abstract void setPattern(String pattern);

  /**
   * NM uses it to decide whether if it is necessary to upload the resource to
   * the shared cache
   * @return true if it is necessary to upload the resource
   *                 to the shared cache,
   *         false otherwise
   */
  @Public
  @Unstable
  public abstract boolean getShouldBeUploadedToSharedCache();

  /**
   * Inform NM whether upload to SCM is needed.
   *
   * @param shouldBeUploadedToSharedCache <em>shouldBeUploadedToSharedCache</em>
   *          of this request
   */
  @Public
  @Unstable
  public abstract void setShouldBeUploadedToSharedCache(
      boolean shouldBeUploadedToSharedCache);
}