content: /*
   *
   * 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.bookkeeper.client;
  
  import static org.apache.bookkeeper.client.api.BKException.Code.WriteException;
  import static org.apache.bookkeeper.common.concurrent.FutureUtils.result;
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.fail;
  
  import java.nio.ByteBuffer;
  import org.apache.bookkeeper.client.api.WriteHandle;
  import org.apache.bookkeeper.conf.ClientConfiguration;
  import org.junit.Test;
  
  /**
   * Test ensemble change has a max num.
   */
  public class TestMaxEnsembleChangeNum extends MockBookKeeperTestCase {
  
      private static final byte[] password = new byte[5];
      private static final byte[] data = new byte[5];
  
      @Test
      public void testChangeEnsembleMaxNumWithWriter() throws Exception {
          long lId;
          int numEntries = 5;
          int changeNum = 5;
          setBookKeeperConfig(new ClientConfiguration().setDelayEnsembleChange(false).setMaxAllowedEnsembleChanges(5));
          try (WriteHandle writer = result(newCreateLedgerOp()
                  .withAckQuorumSize(3)
                  .withWriteQuorumSize(3)
                  .withEnsembleSize(3)
                  .withPassword(password)
                  .execute())) {
              lId = writer.getId();
              //first fragment
              for (int i = 0; i < numEntries; i++) {
                  writer.append(ByteBuffer.wrap(data));
              }
              assertEquals("There should be zero ensemble change",
                      1, getLedgerMetadata(lId).getAllEnsembles().size());
  
              simulateEnsembleChangeWithWriter(changeNum, numEntries, writer);
  
              // one more ensemble change
              startNewBookie();
              killBookie(writer.getLedgerMetadata().getEnsembleAt(writer.getLastAddConfirmed()).get(0));
              // add failure
              try {
                  writer.append(ByteBuffer.wrap(data));
                  fail("should not come to here");
              } catch (BKException exception){
                  assertEquals(exception.getCode(), WriteException);
              }
          }
      }
  
      private void simulateEnsembleChangeWithWriter(int changeNum, int numEntries, WriteHandle writer) throws Exception{
  
          int expectedSize = writer.getLedgerMetadata().getAllEnsembles().size() + 1;
          //kill bookie and add again
          for (int num = 0; num < changeNum; num++){
              startNewBookie();
  
              killBookie(writer.getLedgerMetadata().getEnsembleAt(writer.getLastAddConfirmed()).get(0));
              for (int i = 0; i < numEntries; i++) {
                  writer.append(ByteBuffer.wrap(data));
              }
              // ensure there is a ensemble changed
              assertEquals("There should be one ensemble change",
                      expectedSize + num, writer.getLedgerMetadata().getAllEnsembles().size());
          }
      }
  }
  