samza-core/src/test/java/org/apache/samza/execution/TestStreamEdge.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.samza.execution;

import org.apache.samza.config.ApplicationConfig;
import org.apache.samza.config.Config;
import org.apache.samza.config.MapConfig;
import org.apache.samza.config.StreamConfig;
import org.apache.samza.system.StreamSpec;
import org.junit.Test;

import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

import static org.junit.Assert.assertEquals;

public class TestStreamEdge {
  StreamSpec spec = new StreamSpec("stream-1", "physical-stream-1", "system-1");

  @Test
  public void testGetStreamSpec() {
    StreamEdge edge = new StreamEdge(spec, false, false, new MapConfig());
    assertEquals(edge.getStreamSpec(), spec);
    assertEquals(edge.getStreamSpec().getPartitionCount(), 1 /*StreamSpec.DEFAULT_PARTITION_COUNT*/);

    edge.setPartitionCount(10);
    assertEquals(edge.getStreamSpec().getPartitionCount(), 10);
  }

  @Test
  public void testGetStreamSpec_Batch() {
    Map<String, String> config = new HashMap<>();
    config.put(ApplicationConfig.APP_MODE, ApplicationConfig.ApplicationMode.BATCH.name());
    config.put(ApplicationConfig.APP_RUN_ID, "123");

    // For batch, if the physical name hasn't been generated, it should append the unique id
    StreamSpec batchSpec = new StreamSpec("stream-1", "stream-1", "system-1");
    StreamEdge edge = new StreamEdge(batchSpec, true, false, new MapConfig(config));
    assertEquals(edge.getStreamSpec().getPhysicalName(), batchSpec.getPhysicalName() + "-123");

    // if the physical name has already been geneated somehow, then don't change
    edge = new StreamEdge(spec, true, false, new MapConfig(config));
    assertEquals(edge.getStreamSpec().getPhysicalName(), spec.getPhysicalName());
  }

  @Test
  public void testGenerateConfig() {
    // an example unbounded IO stream
    StreamSpec spec = new StreamSpec("stream-1", "physical-stream-1", "system-1", Collections.singletonMap("property1", "haha"));
    StreamEdge edge = new StreamEdge(spec, false, false, new MapConfig());
    Config config = edge.generateConfig();
    StreamConfig streamConfig = new StreamConfig(config);
    assertEquals(streamConfig.getSystem(spec.getId()), "system-1");
    assertEquals(streamConfig.getPhysicalName(spec.getId()), "physical-stream-1");
    assertEquals(streamConfig.getIsIntermediateStream(spec.getId()), false);
    assertEquals(streamConfig.getStreamProperties(spec.getId()).get("property1"), "haha");

    // bounded stream
    spec = new StreamSpec("stream-1", "physical-stream-1", "system-1", Collections.singletonMap("property1", "haha"));
    edge = new StreamEdge(spec, false, false, new MapConfig());
    config = edge.generateConfig();
    streamConfig = new StreamConfig(config);

    // intermediate stream
    edge = new StreamEdge(spec, true, false, new MapConfig());
    config = edge.generateConfig();
    streamConfig = new StreamConfig(config);
    assertEquals(streamConfig.getIsIntermediateStream(spec.getId()), true);
    assertEquals(streamConfig.getPriority(spec.toSystemStream()), Integer.MAX_VALUE);
  }
}