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.junit.Assert.assertEquals;
  import static org.junit.Assert.assertFalse;
  import static org.junit.Assert.assertTrue;
  
  import java.util.concurrent.CountDownLatch;
  import java.util.concurrent.TimeUnit;
  import java.util.concurrent.atomic.AtomicBoolean;
  import java.util.concurrent.atomic.AtomicInteger;
  import org.apache.bookkeeper.client.BookKeeper.DigestType;
  import org.apache.bookkeeper.conf.ServerConfiguration;
  import org.apache.bookkeeper.test.BookKeeperClusterTestCase;
  import org.junit.Test;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * Test try read last confirmed.
   */
  public class TestTryReadLastConfirmed extends BookKeeperClusterTestCase {
  
      private static final Logger logger = LoggerFactory.getLogger(TestTryReadLastConfirmed.class);
  
      final DigestType digestType;
  
      public TestTryReadLastConfirmed() {
          super(6);
          this.digestType = DigestType.CRC32;
      }
  
      @Test
      public void testTryReadLACWhenAllBookiesUp() throws Exception {
          final int numEntries = 3;
  
          final LedgerHandle lh = bkc.createLedger(3, 3, 1, digestType, "".getBytes());
          LedgerHandle readLh = bkc.openLedgerNoRecovery(lh.getId(), digestType, "".getBytes());
          assertEquals(LedgerHandle.INVALID_ENTRY_ID, readLh.getLastAddConfirmed());
          // add entries
          for (int i = 0; i < numEntries; i++) {
              lh.addEntry(("data" + i).getBytes());
          }
          final AtomicBoolean success = new AtomicBoolean(false);
          final AtomicInteger numCallbacks = new AtomicInteger(0);
          final CountDownLatch latch1 = new CountDownLatch(1);
          readLh.asyncTryReadLastConfirmed(new AsyncCallback.ReadLastConfirmedCallback() {
              @Override
              public void readLastConfirmedComplete(int rc, long lastConfirmed, Object ctx) {
                  numCallbacks.incrementAndGet();
                  if (BKException.Code.OK == rc) {
                      success.set(true);
                  } else {
                      success.set(false);
                  }
                  latch1.countDown();
              }
          }, null);
          latch1.await();
          TimeUnit.SECONDS.sleep(2);
          assertTrue(success.get());
          assertTrue(numCallbacks.get() == 1);
          assertEquals(numEntries - 2, readLh.getLastAddConfirmed());
          // try read last confirmed again
          success.set(false);
          numCallbacks.set(0);
          final CountDownLatch latch2 = new CountDownLatch(1);
          readLh.asyncTryReadLastConfirmed(new AsyncCallback.ReadLastConfirmedCallback() {
              @Override
              public void readLastConfirmedComplete(int rc, long lastConfirmed, Object ctx) {
                  numCallbacks.incrementAndGet();
                  if (BKException.Code.OK == rc && lastConfirmed == (numEntries - 2)) {
                      success.set(true);
                  } else {
                      success.set(false);
                  }
                  latch2.countDown();
              }
          }, null);
          latch2.await();
          TimeUnit.SECONDS.sleep(2);
          assertTrue(success.get());
          assertTrue(numCallbacks.get() == 1);
          assertEquals(numEntries - 2, readLh.getLastAddConfirmed());
  
          lh.close();
          readLh.close();
      }
  
      @Test
      public void testTryReadLaCWhenSomeBookiesDown() throws Exception {
          final int numEntries = 3;
          final int ensembleSize = 3;
          final LedgerHandle lh = bkc.createLedger(ensembleSize, 1, 1, digestType, "".getBytes());
          LedgerHandle readLh = bkc.openLedgerNoRecovery(lh.getId(), digestType, "".getBytes());
          assertEquals(LedgerHandle.INVALID_ENTRY_ID, readLh.getLastAddConfirmed());
          // add entries
          for (int i = 0; i < numEntries; i++) {
              lh.addEntry(("data" + i).getBytes());
          }
          for (int i = 0; i < numEntries; i++) {
              ServerConfiguration[] confs = new ServerConfiguration[ensembleSize - 1];
              for (int j = 0; j < ensembleSize - 1; j++) {
                  int idx = (i + 1 + j) % ensembleSize;
                  confs[j] = killBookie(lh.getCurrentEnsemble().get(idx));
              }
  
              final AtomicBoolean success = new AtomicBoolean(false);
              final AtomicInteger numCallbacks = new AtomicInteger(0);
              final CountDownLatch latch = new CountDownLatch(1);
              final int entryId = i;
              readLh.asyncTryReadLastConfirmed(new AsyncCallback.ReadLastConfirmedCallback() {
                  @Override
                  public void readLastConfirmedComplete(int rc, long lastConfirmed, Object ctx) {
                      numCallbacks.incrementAndGet();
                      if (BKException.Code.OK == rc) {
                          success.set(lastConfirmed == (entryId - 1));
                      } else {
                          success.set(false);
                      }
                      latch.countDown();
                  }
              }, null);
              latch.await();
              assertTrue(success.get());
              assertTrue(numCallbacks.get() == 1);
  
              // start the bookies
              for (ServerConfiguration conf : confs) {
                  startAndAddBookie(conf);
              }
          }
          lh.close();
          readLh.close();
      }
  
      @Test
      public void testTryReadLACWhenAllBookiesDown() throws Exception {
          final int numEntries = 2;
          final int ensembleSize = 3;
          final LedgerHandle lh = bkc.createLedger(ensembleSize, 1, 1, digestType, "".getBytes());
          LedgerHandle readLh = bkc.openLedgerNoRecovery(lh.getId(), digestType, "".getBytes());
          assertEquals(LedgerHandle.INVALID_ENTRY_ID, readLh.getLastAddConfirmed());
          // add entries
          for (int i = 0; i < numEntries; i++) {
              lh.addEntry(("data" + i).getBytes());
          }
          for (int i = 0; i < ensembleSize; i++) {
              killBookie(lh.getCurrentEnsemble().get(i));
          }
          final AtomicBoolean success = new AtomicBoolean(false);
          final AtomicInteger numCallbacks = new AtomicInteger(0);
          final CountDownLatch latch = new CountDownLatch(1);
          readLh.asyncTryReadLastConfirmed(new AsyncCallback.ReadLastConfirmedCallback() {
              @Override
              public void readLastConfirmedComplete(int rc, long lastConfirmed, Object ctx) {
                  logger.info("ReadLastConfirmedComplete : rc = {}, lac = {}.", rc, lastConfirmed);
                  numCallbacks.incrementAndGet();
                  if (BKException.Code.OK == rc) {
                      success.set(lastConfirmed == LedgerHandle.INVALID_ENTRY_ID);
                  } else {
                      success.set(false);
                  }
                  latch.countDown();
              }
          }, null);
          latch.await();
          TimeUnit.SECONDS.sleep(2);
          assertFalse(success.get());
          assertTrue(numCallbacks.get() == 1);
  
          lh.close();
          readLh.close();
      }
  }
  