| /** |
| * 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.delayed; |
| |
| import com.google.common.annotations.Beta; |
| import java.util.Set; |
| import org.apache.bookkeeper.mledger.impl.PositionImpl; |
| |
| /** |
| * Represent the tracker for the delayed delivery of messages for a particular subscription. |
| * |
| * Note: this interface is still being refined and some breaking changes might be introduced. |
| */ |
| @Beta |
| public interface DelayedDeliveryTracker extends AutoCloseable { |
| |
| /** |
| * Add a message to the tracker. |
| * |
| * @param ledgerId the ledgerId |
| * @param entryId the entryId |
| * @param deliveryAt the absolute timestamp at which the message should be tracked |
| * @return true if the message was added to the tracker or false if it should be delivered immediately |
| */ |
| boolean addMessage(long ledgerId, long entryId, long deliveryAt); |
| |
| /** |
| * Return true if there's at least a message that is scheduled to be delivered already. |
| */ |
| boolean hasMessageAvailable(); |
| |
| /** |
| * @return the number of delayed messages being tracked. |
| */ |
| long getNumberOfDelayedMessages(); |
| |
| /** |
| * Get a set of position of messages that have already reached the delivery time. |
| */ |
| Set<PositionImpl> getScheduledMessages(int maxMessages); |
| |
| /** |
| * Tells whether the dispatcher should pause any message deliveries, until the DelayedDeliveryTracker has |
| * more messages available. |
| */ |
| boolean shouldPauseAllDeliveries(); |
| |
| /** |
| * Reset tick time use zk policies cache. |
| * @param tickTime |
| * The tick time for when retrying on delayed delivery messages |
| */ |
| void resetTickTime(long tickTime); |
| |
| /** |
| * Clear all delayed messages from the tracker. |
| */ |
| void clear(); |
| |
| /** |
| * Close the subscription tracker and release all resources. |
| */ |
| void close(); |
| } |