package org.apache.hadoop.chukwa;


import java.io.IOException;
import junit.framework.TestCase;
import org.apache.hadoop.io.DataInputBuffer;
import org.apache.hadoop.io.DataOutputBuffer;

public class ChunkImplTest extends TestCase {
  public void testVersion() {
    ChunkBuilder cb = new ChunkBuilder();
    cb.addRecord("foo".getBytes());
    cb.addRecord("bar".getBytes());
    cb.addRecord("baz".getBytes());
    Chunk c = cb.getChunk();
    DataOutputBuffer ob = new DataOutputBuffer(c.getSerializedSizeEstimate());
    try {
      c.write(ob);
      DataInputBuffer ib = new DataInputBuffer();
      ib.reset(ob.getData(), c.getSerializedSizeEstimate());
      int version = ib.readInt();
      assertEquals(version, ChunkImpl.PROTOCOL_VERSION);
    } catch (IOException e) {
      e.printStackTrace();
      fail("Should nor raise any exception");
    }
  }

  public void testWrongVersion() {
    ChunkBuilder cb = new ChunkBuilder();
    cb.addRecord("foo".getBytes());
    cb.addRecord("bar".getBytes());
    cb.addRecord("baz".getBytes());
    Chunk c = cb.getChunk();
    DataOutputBuffer ob = new DataOutputBuffer(c.getSerializedSizeEstimate());
    try {
      c.write(ob);
      DataInputBuffer ib = new DataInputBuffer();
      ib.reset(ob.getData(), c.getSerializedSizeEstimate());
      // change current chunkImpl version
      ChunkImpl.PROTOCOL_VERSION = ChunkImpl.PROTOCOL_VERSION + 1;
      ChunkImpl.read(ib);
      fail("Should have raised an IOexception");
    } catch (IOException e) {
      // right behavior, do nothing
    }
  }
}