samza-core/src/test/scala/org/apache/samza/serializers/TestCheckpointSerde.scala

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 * to you under the Apache License, Version 2.0 (the
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package org.apache.samza.serializers

import java.util

import org.apache.samza.Partition
import org.apache.samza.checkpoint.Checkpoint
import org.apache.samza.container.TaskName
import org.apache.samza.system.SystemStreamPartition
import org.junit.Assert._
import org.junit.Test

import scala.collection.JavaConverters._
import scala.collection.mutable

class TestCheckpointSerde {
  @Test
  def testExactlyOneOffset {
    val serde = new CheckpointSerde
    var offsets = Map[SystemStreamPartition, String]()
    val systemStreamPartition = new SystemStreamPartition("test-system", "test-stream", new Partition(777))
    offsets += systemStreamPartition -> "1"
    val deserializedOffsets = serde.fromBytes(serde.toBytes(new Checkpoint(offsets.asJava)))
    assertEquals("1", deserializedOffsets.getOffsets.get(systemStreamPartition))
    assertEquals(1, deserializedOffsets.getOffsets.size)
  }

  @Test
  def testChangelogPartitionMappingRoundTrip {
    val mapping = new util.HashMap[TaskName, java.lang.Integer]()
    mapping.put(new TaskName("Ted"), 0)
    mapping.put(new TaskName("Dougal"), 1)
    mapping.put(new TaskName("Jack"), 2)

    val checkpointSerde = new CheckpointSerde
    val asBytes = checkpointSerde.changelogPartitionMappingToBytes(mapping)
    val backToMap = checkpointSerde.changelogPartitionMappingFromBytes(asBytes)

    assertEquals(mapping, backToMap)
    assertNotSame(mapping, backToMap)
  }

  @Test
  def testNullCheckpointSerde: Unit = {
    val checkpointBytes = null.asInstanceOf[Array[Byte]]
    val checkpointSerde = new CheckpointSerde
    val checkpoint = checkpointSerde.fromBytes(checkpointBytes)
    assertNull(checkpoint)
  }
}