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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.index.cache.query;
import org.apache.lucene.search.DocIdSet;
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 QueryCacheStats implements Streamable, ToXContent {
long ramBytesUsed;
long hitCount;
long missCount;
long cacheCount;
long cacheSize;
public QueryCacheStats() {
}
public QueryCacheStats(long ramBytesUsed, long hitCount, long missCount, long cacheCount, long cacheSize) {
this.ramBytesUsed = ramBytesUsed;
this.hitCount = hitCount;
this.missCount = missCount;
this.cacheCount = cacheCount;
this.cacheSize = cacheSize;
}
public void add(QueryCacheStats stats) {
ramBytesUsed += stats.ramBytesUsed;
hitCount += stats.hitCount;
missCount += stats.missCount;
cacheCount += stats.cacheCount;
cacheSize += stats.cacheSize;
}
public long getMemorySizeInBytes() {
return ramBytesUsed;
}
public ByteSizeValue getMemorySize() {
return new ByteSizeValue(ramBytesUsed);
}
/**
* The total number of lookups in the cache.
*/
public long getTotalCount() {
return hitCount + missCount;
}
/**
* The number of successful lookups in the cache.
*/
public long getHitCount() {
return hitCount;
}
/**
* The number of lookups in the cache that failed to retrieve a {@link DocIdSet}.
*/
public long getMissCount() {
return missCount;
}
/**
* The number of {@link DocIdSet}s that have been cached.
*/
public long getCacheCount() {
return cacheCount;
}
/**
* The number of {@link DocIdSet}s that are in the cache.
*/
public long getCacheSize() {
return cacheSize;
}
/**
* The number of {@link DocIdSet}s that have been evicted from the cache.
*/
public long getEvictions() {
return cacheCount - cacheSize;
}
public static QueryCacheStats readQueryCacheStats(StreamInput in) throws IOException {
QueryCacheStats stats = new QueryCacheStats();
stats.readFrom(in);
return stats;
}
@Override
public void readFrom(StreamInput in) throws IOException {
ramBytesUsed = in.readLong();
hitCount = in.readLong();
missCount = in.readLong();
cacheCount = in.readLong();
cacheSize = in.readLong();
}
@Override
public void writeTo(StreamOutput out) throws IOException {
out.writeLong(ramBytesUsed);
out.writeLong(hitCount);
out.writeLong(missCount);
out.writeLong(cacheCount);
out.writeLong(cacheSize);
}
@Override
public XContentBuilder toXContent(XContentBuilder builder, ToXContent.Params params) throws IOException {
builder.startObject(Fields.QUERY_CACHE);
builder.byteSizeField(Fields.MEMORY_SIZE_IN_BYTES, Fields.MEMORY_SIZE, ramBytesUsed);
builder.field(Fields.TOTAL_COUNT, getTotalCount());
builder.field(Fields.HIT_COUNT, getHitCount());
builder.field(Fields.MISS_COUNT, getMissCount());
builder.field(Fields.CACHE_SIZE, getCacheSize());
builder.field(Fields.CACHE_COUNT, getCacheCount());
builder.field(Fields.EVICTIONS, getEvictions());
builder.endObject();
return builder;
}
static final class Fields {
static final XContentBuilderString QUERY_CACHE = new XContentBuilderString("query_cache");
static final XContentBuilderString MEMORY_SIZE = new XContentBuilderString("memory_size");
static final XContentBuilderString MEMORY_SIZE_IN_BYTES = new XContentBuilderString("memory_size_in_bytes");
static final XContentBuilderString TOTAL_COUNT = new XContentBuilderString("total_count");
static final XContentBuilderString HIT_COUNT = new XContentBuilderString("hit_count");
static final XContentBuilderString MISS_COUNT = new XContentBuilderString("miss_count");
static final XContentBuilderString CACHE_SIZE = new XContentBuilderString("cache_size");
static final XContentBuilderString CACHE_COUNT = new XContentBuilderString("cache_count");
static final XContentBuilderString EVICTIONS = new XContentBuilderString("evictions");
}
}
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