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/*
 * Licensed to ElasticSearch and Shay Banon 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.index.cache.id;

import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.io.stream.Streamable;
import org.elasticsearch.common.unit.ByteSizeValue;
import org.elasticsearch.common.xcontent.ToXContent;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.common.xcontent.XContentBuilderString;

import java.io.IOException;

/**
 */
public class IdCacheStats implements Streamable, ToXContent {

    long memorySize;

    public IdCacheStats() {
    }

    public IdCacheStats(long memorySize) {
        this.memorySize = memorySize;
    }

    public void add(IdCacheStats stats) {
        this.memorySize += stats.memorySize;
    }

    public long getMemorySizeInBytes() {
        return this.memorySize;
    }

    public ByteSizeValue getMemorySize() {
        return new ByteSizeValue(memorySize);
    }

    public static IdCacheStats readIdCacheStats(StreamInput in) throws IOException {
        IdCacheStats stats = new IdCacheStats();
        stats.readFrom(in);
        return stats;
    }

    @Override
    public void readFrom(StreamInput in) throws IOException {
        memorySize = in.readVLong();
    }

    @Override
    public void writeTo(StreamOutput out) throws IOException {
        out.writeVLong(memorySize);
    }

    @Override
    public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
        builder.startObject(Fields.ID_CACHE);
        builder.field(Fields.MEMORY_SIZE, getMemorySize().toString());
        builder.field(Fields.MEMORY_SIZE_IN_BYTES, memorySize);
        builder.endObject();
        return builder;
    }

    static final class Fields {
        static final XContentBuilderString ID_CACHE = new XContentBuilderString("id_cache");
        static final XContentBuilderString MEMORY_SIZE = new XContentBuilderString("memory_size");
        static final XContentBuilderString MEMORY_SIZE_IN_BYTES = new XContentBuilderString("memory_size_in_bytes");
    }
}




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