co.cask.wrangler.WranglerPipelineContext Maven / Gradle / Ivy

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/*
 * Copyright © 2017 Cask Data, Inc.
 *
 * 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 co.cask.wrangler;

import co.cask.cdap.etl.api.Lookup;
import co.cask.cdap.etl.api.StageMetrics;
import co.cask.cdap.etl.api.TransformContext;
import co.cask.wrangler.api.Executor;
import co.cask.wrangler.api.ExecutorContext;
import co.cask.wrangler.api.TransientStore;

import java.net.URL;
import java.util.Iterator;
import java.util.Map;

/**
 * This class {@link WranglerPipelineContext} is a runtime context that is provided for each
 * {@link Executor} execution.
 */
class WranglerPipelineContext implements ExecutorContext {
  private final Environment environment;
  private final TransformContext context;

  private final TransientStore store;
  private StageMetrics metrics;
  private String name;
  private Map properties;

  WranglerPipelineContext(Environment environment, TransformContext context, TransientStore store) {
    this.environment = environment;
    this.metrics = context.getMetrics();
    this.name = context.getStageName();
    this.properties = context.getPluginProperties().getProperties();
    Iterator> iterator = context.getArguments().iterator();
    while(iterator.hasNext()) {
      Map.Entry next = iterator.next();
      this.properties.put(next.getKey(), next.getValue());
    }
    this.context = context;
    this.store = store;
  }

  /**
   * @return Environment this context is prepared for.
   */
  @Override
  public Environment getEnvironment() {
    return environment;
  }

  /**
   * @return Measurements context.
   */
  @Override
  public StageMetrics getMetrics() {
    return metrics;
  }

  /**
   * @return Context name.
   */
  @Override
  public String getContextName() {
    return name;
  }

  /**
   * @return Properties associated with run and pipeline.
   */
  @Override
  public Map getProperties() {
    return properties;
  }

  /**
   * Returns a valid service url.
   *
   * @param applicationId id of the application to which a service url.
   * @param serviceId     id of the service within application.
   * @return URL if service exists, else null.
   */
  @Override
  public URL getService(String applicationId, String serviceId) {
    return context.getServiceURL(applicationId, serviceId);
  }

  @Override
  public TransientStore getTransientStore() {
    return store;
  }

  /**
   * Provides a handle to dataset for lookup.
   *
   * @param s name of the dataset.
   * @param map properties associated with dataset.
   * @return handle to dataset for lookup.
   */
  @Override
  public  Lookup provide(String s, Map map) {
    return context.provide(s, map);
  }
}