FakeFlow.java

/*
 * Copyright © 2014 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.cdap.client.app;

import co.cask.cdap.api.annotation.ProcessInput;
import co.cask.cdap.api.annotation.UseDataSet;
import co.cask.cdap.api.common.Bytes;
import co.cask.cdap.api.flow.AbstractFlow;
import co.cask.cdap.api.flow.flowlet.AbstractFlowlet;
import co.cask.cdap.api.flow.flowlet.InputContext;
import co.cask.cdap.api.flow.flowlet.StreamEvent;

import java.nio.charset.CharacterCodingException;

/**
 *
 */
public class FakeFlow extends AbstractFlow {

  public static final String NAME = "FakeFlow";
  public static final String FLOWLET_NAME = "fakeFlowlet";

  @Override
  protected void configureFlow() {
    setName(NAME);
    setDescription("Does nothing");
    addFlowlet(FLOWLET_NAME, new FakeFlowlet());
    connectStream(FakeApp.STREAM_NAME, FLOWLET_NAME);
  }

  /**
   *
   */
  public static final class FakeFlowlet extends AbstractFlowlet {

    @UseDataSet(FakeApp.DS_NAME)
    private FakeDataset fakeDataset;

    @ProcessInput
    public void process(StreamEvent event, InputContext context) throws CharacterCodingException {
      String eventBody = Bytes.toString(event.getBody());
      int separatorIndex = eventBody.indexOf(":");
      if (separatorIndex != -1) {
        fakeDataset.put(Bytes.toBytes(eventBody.substring(0, separatorIndex)),
                        Bytes.toBytes(eventBody.substring(separatorIndex + 1)));
      }
    }

  }
}