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.assertTrue;
  
  import java.util.Arrays;
  import java.util.Collection;
  import java.util.concurrent.CountDownLatch;
  import java.util.concurrent.atomic.AtomicBoolean;
  import java.util.concurrent.atomic.AtomicInteger;
  import org.apache.bookkeeper.bookie.InterleavedLedgerStorage;
  import org.apache.bookkeeper.bookie.LedgerStorage;
  import org.apache.bookkeeper.bookie.SortedLedgerStorage;
  import org.apache.bookkeeper.bookie.storage.ldb.DbLedgerStorage;
  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.junit.runner.RunWith;
  import org.junit.runners.Parameterized;
  import org.junit.runners.Parameterized.Parameters;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  /**
   * Test read last confirmed long by polling.
   */
  @RunWith(Parameterized.class)
  public class TestReadLastConfirmedLongPoll extends BookKeeperClusterTestCase {
      private static final Logger log = LoggerFactory.getLogger(TestReadLastConfirmedLongPoll.class);
      final DigestType digestType;
  
      public TestReadLastConfirmedLongPoll(Class<? extends LedgerStorage> storageClass) {
          super(6);
          this.digestType = DigestType.CRC32;
          baseConf.setLedgerStorageClass(storageClass.getName());
      }
  
      @Parameters
      public static Collection<Object[]> configs() {
          return Arrays.asList(new Object[][] {
              { InterleavedLedgerStorage.class },
              { SortedLedgerStorage.class },
              { DbLedgerStorage.class },
          });
      }
  
      @Test
      public void testReadLACLongPollWhenAllBookiesUp() 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 - 1); i++) {
              lh.addEntry(("data" + i).getBytes());
          }
          final AtomicBoolean success = new AtomicBoolean(false);
          final AtomicInteger numCallbacks = new AtomicInteger(0);
          final CountDownLatch firstReadComplete = 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);
                  }
                  firstReadComplete.countDown();
              }
          }, null);
          firstReadComplete.await();
          assertTrue(success.get());
          assertTrue(numCallbacks.get() == 1);
          assertEquals(numEntries - 3, readLh.getLastAddConfirmed());
          // try read last confirmed again
          success.set(false);
          numCallbacks.set(0);
          long entryId = readLh.getLastAddConfirmed() + 1;
          final CountDownLatch secondReadComplete = new CountDownLatch(1);
          readLh.asyncReadLastConfirmedAndEntry(entryId++, 1000, true,
                  new AsyncCallback.ReadLastConfirmedAndEntryCallback() {
              @Override
              public void readLastConfirmedAndEntryComplete(int rc, long lastConfirmed, LedgerEntry entry, Object ctx) {
                  numCallbacks.incrementAndGet();
                  if (BKException.Code.OK == rc && lastConfirmed == (numEntries - 2)) {
                      success.set(true);
                  } else {
                      success.set(false);
                  }
                  secondReadComplete.countDown();
              }
          }, null);
          lh.addEntry(("data" + (numEntries - 1)).getBytes());
          secondReadComplete.await();
          assertTrue(success.get());
          assertTrue(numCallbacks.get() == 1);
          assertEquals(numEntries - 2, readLh.getLastAddConfirmed());
  
          success.set(false);
          numCallbacks.set(0);
          final CountDownLatch thirdReadComplete = new CountDownLatch(1);
          readLh.asyncReadLastConfirmedAndEntry(entryId++, 1000, false,
                  new AsyncCallback.ReadLastConfirmedAndEntryCallback() {
              @Override
              public void readLastConfirmedAndEntryComplete(int rc, long lastConfirmed, LedgerEntry entry, Object ctx) {
                  numCallbacks.incrementAndGet();
                  if (BKException.Code.OK == rc && lastConfirmed == (numEntries - 1)) {
                      success.set(true);
                  } else {
                      success.set(false);
                  }
                  thirdReadComplete.countDown();
              }
          }, null);
          lh.addEntry(("data" + numEntries).getBytes());
          thirdReadComplete.await();
          assertTrue(success.get());
          assertTrue(numCallbacks.get() == 1);
          assertEquals(numEntries - 1, readLh.getLastAddConfirmed());
          lh.close();
          readLh.close();
      }
  
      @Test
      public void testReadLACLongPollWhenSomeBookiesDown() throws Exception {
          final int numEntries = 3;
          final LedgerHandle lh = bkc.createLedger(3, 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[numEntries - 1];
              for (int j = 0; j < numEntries - 1; j++) {
                  int idx = (i + 1 + j) % numEntries;
                  confs[j] = killBookie(LedgerMetadataUtils.getLastEnsembleValue(lh.getLedgerMetadata()).get(idx));
              }
  
              final AtomicBoolean entryAsExpected = new AtomicBoolean(false);
              final AtomicBoolean success = new AtomicBoolean(false);
              final AtomicInteger numCallbacks = new AtomicInteger(0);
              final CountDownLatch readComplete = 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(true);
                          entryAsExpected.set(lastConfirmed == (entryId - 1));
                      } else {
                          System.out.println("Return value" + rc);
                          success.set(false);
                          entryAsExpected.set(false);
                      }
                      readComplete.countDown();
                  }
              }, null);
              readComplete.await();
              assertTrue(success.get());
              assertTrue(entryAsExpected.get());
              assertTrue(numCallbacks.get() == 1);
  
              lh.close();
              readLh.close();
  
              // start the bookies
              for (ServerConfiguration conf : confs) {
                  startAndAddBookie(conf);
              }
          }
      }
  }
  