/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF 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.apache.hadoop.hbase.regionserver.wal;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.hbase.io.TagCompressionContext;
import org.apache.hadoop.hbase.io.util.Dictionary;
/**
* Context that holds the various dictionaries for compression in HLog.
*/
@InterfaceAudience.Private
class CompressionContext {
static final String ENABLE_WAL_TAGS_COMPRESSION =
"hbase.regionserver.wal.tags.enablecompression";
final Dictionary regionDict;
final Dictionary tableDict;
final Dictionary familyDict;
final Dictionary qualifierDict;
final Dictionary rowDict;
// Context used for compressing tags
TagCompressionContext tagCompressionContext = null;
public CompressionContext(Class<? extends Dictionary> dictType, boolean recoveredEdits,
boolean hasTagCompression) throws SecurityException, NoSuchMethodException,
InstantiationException, IllegalAccessException, InvocationTargetException {
Constructor<? extends Dictionary> dictConstructor =
dictType.getConstructor();
regionDict = dictConstructor.newInstance();
tableDict = dictConstructor.newInstance();
familyDict = dictConstructor.newInstance();
qualifierDict = dictConstructor.newInstance();
rowDict = dictConstructor.newInstance();
if (recoveredEdits) {
// This will never change
regionDict.init(1);
tableDict.init(1);
} else {
regionDict.init(Short.MAX_VALUE);
tableDict.init(Short.MAX_VALUE);
}
rowDict.init(Short.MAX_VALUE);
familyDict.init(Byte.MAX_VALUE);
qualifierDict.init(Byte.MAX_VALUE);
if (hasTagCompression) {
tagCompressionContext = new TagCompressionContext(dictType);
}
}
void clear() {
regionDict.clear();
tableDict.clear();
familyDict.clear();
qualifierDict.clear();
rowDict.clear();
if (tagCompressionContext != null) {
tagCompressionContext.clear();
}
}
}