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Adds support for calculating and sending diffs instead of full cluster state of the most frequently changing elements - cluster state, meta data and routing table. Closes elastic#6295
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108 changes: 108 additions & 0 deletions
108
src/main/java/org/elasticsearch/cluster/AbstractDiffable.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,108 @@ | ||
| /* | ||
| * Licensed to Elasticsearch under one or more contributor | ||
| * license agreements. See the NOTICE file distributed with | ||
| * this work for additional information regarding copyright | ||
| * ownership. Elasticsearch 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. | ||
| */ | ||
|
|
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| package org.elasticsearch.cluster; | ||
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| import org.elasticsearch.common.Nullable; | ||
| import org.elasticsearch.common.io.stream.StreamableReader; | ||
| import org.elasticsearch.common.io.stream.StreamInput; | ||
| import org.elasticsearch.common.io.stream.StreamOutput; | ||
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| import java.io.IOException; | ||
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| /** | ||
| * Abstract diffable object with simple diffs implementation that sends the entire object if object has changed or | ||
| * nothing is object remained the same. | ||
| */ | ||
| public abstract class AbstractDiffable<T extends Diffable<T>> implements Diffable<T> { | ||
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| @Override | ||
| public Diff<T> diff(T previousState) { | ||
| if (this.get().equals(previousState)) { | ||
| return new CompleteDiff<>(); | ||
| } else { | ||
| return new CompleteDiff<>(get()); | ||
| } | ||
| } | ||
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| @Override | ||
| public Diff<T> readDiffFrom(StreamInput in) throws IOException { | ||
| return new CompleteDiff<>(this, in); | ||
| } | ||
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| public static <T extends Diffable<T>> Diff<T> readDiffFrom(StreamableReader<T> reader, StreamInput in) throws IOException { | ||
| return new CompleteDiff<T>(reader, in); | ||
| } | ||
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| private static class CompleteDiff<T extends Diffable<T>> implements Diff<T> { | ||
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| @Nullable | ||
| private final T part; | ||
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| /** | ||
| * Creates simple diff with changes | ||
| */ | ||
| public CompleteDiff(T part) { | ||
| this.part = part; | ||
| } | ||
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| /** | ||
| * Creates simple diff without changes | ||
| */ | ||
| public CompleteDiff() { | ||
| this.part = null; | ||
| } | ||
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| /** | ||
| * Read simple diff from the stream | ||
| */ | ||
| public CompleteDiff(StreamableReader<T> reader, StreamInput in) throws IOException { | ||
| if (in.readBoolean()) { | ||
| this.part = reader.readFrom(in); | ||
| } else { | ||
| this.part = null; | ||
| } | ||
| } | ||
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| @Override | ||
| public void writeTo(StreamOutput out) throws IOException { | ||
| if (part != null) { | ||
| out.writeBoolean(true); | ||
| part.writeTo(out); | ||
| } else { | ||
| out.writeBoolean(false); | ||
| } | ||
| } | ||
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| @Override | ||
| public T apply(T part) { | ||
| if (this.part != null) { | ||
| return this.part; | ||
| } else { | ||
| return part; | ||
| } | ||
| } | ||
| } | ||
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| @SuppressWarnings("unchecked") | ||
| public T get() { | ||
| return (T) this; | ||
| } | ||
| } | ||
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