io.atomix.copycat.NoOpCommand Maven / Gradle / Ivy
/*
* Copyright 2015 the original author or authors.
*
* 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
*/
package io.atomix.copycat;
import io.atomix.catalyst.buffer.BufferInput;
import io.atomix.catalyst.buffer.BufferOutput;
import io.atomix.catalyst.serializer.CatalystSerializable;
import io.atomix.catalyst.serializer.Serializer;
/**
* Special placeholder command representing a client operation that has no effect on the state machine.
*
* No-op commands are submitted by clients to the cluster to complete missing command sequence numbers.
* Copycat clusters require that clients submit commands in sequential order and use a client-provided
* sequence number to ensure FIFO ordering of operations submitted to the cluster. In the event that a
* command fails to be committed to the cluster, a client can resubmit a no-op command to ensure command
* sequence numbers continue to progress.
*
* @author © 2015 - 2025 Weber Informatics LLC | Privacy Policy