| /* |
| * 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.pulsar.broker.service.persistent; |
| |
| import static com.google.common.base.Preconditions.checkArgument; |
| import java.util.Optional; |
| import java.util.concurrent.atomic.AtomicIntegerFieldUpdater; |
| import org.apache.bookkeeper.mledger.AsyncCallbacks; |
| import org.apache.bookkeeper.mledger.ManagedCursor; |
| import org.apache.bookkeeper.mledger.ManagedLedgerException; |
| import org.apache.bookkeeper.mledger.Position; |
| import org.apache.pulsar.client.impl.MessageImpl; |
| import org.apache.pulsar.common.protocol.Commands; |
| import org.apache.pulsar.common.util.Codec; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * given a timestamp find the first message (position) (published) at or before the timestamp. |
| */ |
| public class PersistentMessageFinder implements AsyncCallbacks.FindEntryCallback { |
| private final ManagedCursor cursor; |
| private final String subName; |
| private final String topicName; |
| private long timestamp = 0; |
| |
| private static final int FALSE = 0; |
| private static final int TRUE = 1; |
| @SuppressWarnings("unused") |
| private volatile int messageFindInProgress = FALSE; |
| private static final AtomicIntegerFieldUpdater<PersistentMessageFinder> messageFindInProgressUpdater = |
| AtomicIntegerFieldUpdater |
| .newUpdater(PersistentMessageFinder.class, "messageFindInProgress"); |
| |
| public PersistentMessageFinder(String topicName, ManagedCursor cursor) { |
| this.topicName = topicName; |
| this.cursor = cursor; |
| this.subName = Codec.decode(cursor.getName()); |
| } |
| |
| public void findMessages(final long timestamp, AsyncCallbacks.FindEntryCallback callback) { |
| this.timestamp = timestamp; |
| if (messageFindInProgressUpdater.compareAndSet(this, FALSE, TRUE)) { |
| if (log.isDebugEnabled()) { |
| log.debug("[{}] Starting message position find at timestamp {}", subName, timestamp); |
| } |
| |
| cursor.asyncFindNewestMatching(ManagedCursor.FindPositionConstraint.SearchAllAvailableEntries, entry -> { |
| try { |
| long entryTimestamp = Commands.getEntryTimestamp(entry.getDataBuffer()); |
| return MessageImpl.isEntryPublishedEarlierThan(entryTimestamp, timestamp); |
| } catch (Exception e) { |
| log.error("[{}][{}] Error deserializing message for message position find", topicName, subName, e); |
| } finally { |
| entry.release(); |
| } |
| return false; |
| }, this, callback, true); |
| } else { |
| if (log.isDebugEnabled()) { |
| log.debug("[{}][{}] Ignore message position find scheduled task, last find is still running", topicName, |
| subName); |
| } |
| callback.findEntryFailed( |
| new ManagedLedgerException.ConcurrentFindCursorPositionException("last find is still running"), |
| Optional.empty(), null); |
| } |
| } |
| |
| private static final Logger log = LoggerFactory.getLogger(PersistentMessageFinder.class); |
| |
| @Override |
| public void findEntryComplete(Position position, Object ctx) { |
| checkArgument(ctx instanceof AsyncCallbacks.FindEntryCallback); |
| AsyncCallbacks.FindEntryCallback callback = (AsyncCallbacks.FindEntryCallback) ctx; |
| if (position != null) { |
| log.info("[{}][{}] Found position {} closest to provided timestamp {}", topicName, subName, position, |
| timestamp); |
| } else { |
| if (log.isDebugEnabled()) { |
| log.debug("[{}][{}] No position found closest to provided timestamp {}", topicName, subName, timestamp); |
| } |
| } |
| messageFindInProgress = FALSE; |
| callback.findEntryComplete(position, null); |
| } |
| |
| @Override |
| public void findEntryFailed(ManagedLedgerException exception, Optional<Position> failedReadPosition, Object ctx) { |
| checkArgument(ctx instanceof AsyncCallbacks.FindEntryCallback); |
| AsyncCallbacks.FindEntryCallback callback = (AsyncCallbacks.FindEntryCallback) ctx; |
| if (log.isDebugEnabled()) { |
| log.debug("[{}][{}] message position find operation failed for provided timestamp {}", topicName, subName, |
| timestamp, exception); |
| } |
| messageFindInProgress = FALSE; |
| callback.findEntryFailed(exception, failedReadPosition, null); |
| } |
| } |