org.elasticsearch.common.io.stream.CachedStreamInput Maven / Gradle / Ivy
/*
* 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.common.io.stream;
import org.elasticsearch.common.compress.Compressor;
import java.io.IOException;
import java.lang.ref.SoftReference;
/**
*
*/
public class CachedStreamInput {
static class Entry {
char[] chars = new char[80];
final HandlesStreamInput handles;
Entry(HandlesStreamInput handles) {
this.handles = handles;
}
}
private static final ThreadLocal> cache = new ThreadLocal>();
static Entry instance() {
SoftReference ref = cache.get();
Entry entry = ref == null ? null : ref.get();
if (entry == null) {
HandlesStreamInput handles = new HandlesStreamInput();
entry = new Entry(handles);
cache.set(new SoftReference(entry));
}
return entry;
}
public static void clear() {
cache.remove();
}
public static StreamInput compressed(Compressor compressor, StreamInput in) throws IOException {
return compressor.streamInput(in);
}
public static HandlesStreamInput cachedHandles(StreamInput in) {
HandlesStreamInput handles = instance().handles;
handles.reset(in);
return handles;
}
public static HandlesStreamInput cachedHandlesCompressed(Compressor compressor, StreamInput in) throws IOException {
Entry entry = instance();
entry.handles.reset(compressor.streamInput(in));
return entry.handles;
}
public static char[] getCharArray(int size) {
Entry entry = instance();
if (entry.chars.length < size) {
entry.chars = new char[size];
}
return entry.chars;
}
}