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Add StreamableResponseAction to aid in deprecation of Streamable (ela…
…stic#43770) The Action base class currently works for both Streamable and Writeable response types. This commit intorduces StreamableResponseAction, for which only the legacy Action implementions which provide newResponse() will extend. This eliminates the need for overriding newResponse() with an UnsupportedOperationException. relates elastic#34389
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51
server/src/main/java/org/elasticsearch/action/StreamableResponseAction.java
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/* | ||
* 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.action; | ||
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import org.elasticsearch.common.io.stream.Writeable; | ||
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/** | ||
* An action for with the response type implements {@link org.elasticsearch.common.io.stream.Streamable}. | ||
* @deprecated Use {@link Action} directly and provide a {@link Writeable.Reader} | ||
*/ | ||
@Deprecated | ||
public abstract class StreamableResponseAction<Response extends ActionResponse> extends Action<Response> { | ||
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protected StreamableResponseAction(String name) { | ||
super(name); | ||
} | ||
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/** | ||
* Creates a new response instance. | ||
* @deprecated Implement {@link #getResponseReader()} instead and make this method throw an | ||
* {@link UnsupportedOperationException} | ||
*/ | ||
@Deprecated | ||
public abstract Response newResponse(); | ||
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@Override | ||
public final Writeable.Reader<Response> getResponseReader() { | ||
return in -> { | ||
Response response = newResponse(); | ||
response.readFrom(in); | ||
return response; | ||
}; | ||
} | ||
} |
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