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feat: Add ReassignmentHandler which is notified on client reassignment (
#886) This enables clients to respond to a reassignment by cancelling outstanding actions and nacking all messages. Fixes #869
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...pubsublite/src/main/java/com/google/cloud/pubsublite/cloudpubsub/ReassignmentHandler.java
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/* | ||
* Copyright 2021 Google LLC | ||
* | ||
* Licensed 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. | ||
*/ | ||
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package com.google.cloud.pubsublite.cloudpubsub; | ||
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import com.google.cloud.pubsublite.Partition; | ||
import java.util.Set; | ||
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/** | ||
* A ReassignmentHandler is called any time a new partition assignment is received from the server. | ||
* It will be called with both the previous and new assignments as decided by the backend. | ||
* | ||
* <p>The client library will not acknowledge the assignment until handleReassignment returns. The | ||
* assigning backend will not assign any of the partitions in `before` to another server unless the | ||
* assignment is acknowledged, or a client takes too long to acknowledged (currently 30 seconds from | ||
* the time the assignment is sent from server's point of view). | ||
* | ||
* <p>Because of the above, as long as reassignment handling is processed quickly, it can be used to | ||
* abort outstanding operations on partitions which are being assigned away from this client, or to | ||
* pre-warm state which will be used by the MessageReceiver. | ||
*/ | ||
public interface ReassignmentHandler { | ||
/** | ||
* Called with the previous and new assignment delivered to this client on an assignment change. | ||
* The assignment will not be acknowledged until this method returns, so it should complete | ||
* quickly, or the backend will assume it is non-responsive and assign all partitions away without | ||
* waiting for acknowledgement. | ||
* | ||
* <p>handleReassignment will only be called after no new messages will be delivered for the | ||
* partition. | ||
* | ||
* <p>Acks or nacks on messages from partitions being assigned away will have no effect. | ||
* | ||
* @param before the previous assignment | ||
* @param after the new assignment | ||
*/ | ||
void handleReassignment(Set<Partition> before, Set<Partition> after); | ||
} |
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