org.elasticsearch.search.aggregations.bucket.BucketStreams Maven / Gradle / Ivy
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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.
*/
package org.elasticsearch.search.aggregations.bucket;
import com.google.common.collect.ImmutableMap;
import org.elasticsearch.common.bytes.BytesReference;
import org.elasticsearch.common.collect.MapBuilder;
import org.elasticsearch.common.io.stream.StreamInput;
import java.io.IOException;
public class BucketStreams {
private static ImmutableMap STREAMS = ImmutableMap.of();
/**
* A stream that knows how to read a bucket from the input.
*/
public static interface Stream {
B readResult(StreamInput in, BucketStreamContext context) throws IOException;
BucketStreamContext getBucketStreamContext(B bucket);
}
/**
* Registers the given stream and associate it with the given types.
*
* @param stream The streams to register
* @param types The types associated with the streams
*/
public static synchronized void registerStream(Stream stream, BytesReference... types) {
MapBuilder uStreams = MapBuilder.newMapBuilder(STREAMS);
for (BytesReference type : types) {
uStreams.put(type, stream);
}
STREAMS = uStreams.immutableMap();
}
/**
* Returns the stream that is registered for the given type
*
* @param type The given type
* @return The associated stream
*/
public static Stream stream(BytesReference type) {
return STREAMS.get(type);
}
}