/*
* Copyright 2016 Naver Corp.
*
* Licensed 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 com.navercorp.pinpoint.common.server.bo.codec.stat.strategy;
import com.navercorp.pinpoint.common.buffer.Buffer;
import com.navercorp.pinpoint.common.server.bo.codec.TypedBufferHandler;
import com.navercorp.pinpoint.common.server.bo.codec.strategy.EncodingStrategy;
import com.navercorp.pinpoint.common.server.bo.codec.strategy.impl.RepeatCountEncodingStrategy;
import com.navercorp.pinpoint.common.server.bo.codec.strategy.impl.ValueEncodingStrategy;
import com.navercorp.pinpoint.common.util.BytesUtils;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
/**
* @author HyunGil Jeong
*/
public enum UnsignedShortEncodingStrategy implements EncodingStrategy<Short> {
NONE(new ValueEncodingStrategy.Unsigned<Short>(TypedBufferHandler.SHORT_BUFFER_HANDLER)),
REPEAT_COUNT(new RepeatCountEncodingStrategy.Unsigned<Short>(TypedBufferHandler.SHORT_BUFFER_HANDLER));
private final EncodingStrategy<Short> delegate;
UnsignedShortEncodingStrategy(EncodingStrategy<Short> delegate) {
this.delegate = delegate;
}
@Override
public byte getCode() {
return this.delegate.getCode();
}
@Override
public void encodeValues(Buffer buffer, List<Short> values) {
this.delegate.encodeValues(buffer, values);
}
@Override
public List<Short> decodeValues(Buffer buffer, int numValues) {
return this.delegate.decodeValues(buffer, numValues);
}
public static UnsignedShortEncodingStrategy getFromCode(int code) {
for (UnsignedShortEncodingStrategy encodingStrategy : UnsignedShortEncodingStrategy.values()) {
if (encodingStrategy.getCode() == (code & 0xFF)) {
return encodingStrategy;
}
}
throw new IllegalArgumentException("Unknown code : " + code);
}
public static class Analyzer implements StrategyAnalyzer<Short> {
private final EncodingStrategy<Short> bestStrategy;
private final List<Short> values;
private Analyzer(EncodingStrategy<Short> bestStrategy, List<Short> values) {
this.bestStrategy = bestStrategy;
this.values = values;
}
@Override
public EncodingStrategy<Short> getBestStrategy() {
return this.bestStrategy;
}
@Override
public List<Short> getValues() {
return this.values;
}
public static class Builder implements StrategyAnalyzerBuilder<Short> {
private static final int SHORT_BYTE_SIZE = 2;
private final List<Short> values = new ArrayList<Short>();
private short previousValue = 0;
private int byteSizeValue = 0;
private int byteSizeRepeatCount = 0;
private int repeatedValueCount = 0;
@Override
public StrategyAnalyzerBuilder<Short> addValue(Short value) {
if (this.values.isEmpty()) {
initializeByteSizes();
} else {
updateByteSizes(value);
}
this.previousValue = value;
this.values.add(value);
return this;
}
@Override
public StrategyAnalyzer<Short> build() {
if (this.repeatedValueCount > 0) {
this.byteSizeRepeatCount += BytesUtils.computeVar32Size(this.repeatedValueCount);
}
EncodingStrategy<Short> bestStrategy;
int minimumNumBytesUsed = Collections.min(Arrays.asList(
this.byteSizeValue,
this.byteSizeRepeatCount));
if (this.byteSizeValue == minimumNumBytesUsed) {
bestStrategy = NONE;
} else {
bestStrategy = REPEAT_COUNT;
}
List<Short> values = new ArrayList<Short>(this.values);
this.values.clear();
return new Analyzer(bestStrategy, values);
}
int getByteSizeValue() {
return byteSizeValue;
}
int getByteSizeRepeatCount() {
return byteSizeRepeatCount;
}
private void initializeByteSizes() {
this.byteSizeValue = SHORT_BYTE_SIZE;
this.repeatedValueCount = 1;
this.byteSizeRepeatCount = SHORT_BYTE_SIZE;
}
private void updateByteSizes(int value) {
this.byteSizeValue += SHORT_BYTE_SIZE;
if (this.previousValue != value) {
this.byteSizeRepeatCount += BytesUtils.computeVar32Size(this.repeatedValueCount);
this.byteSizeRepeatCount += 2;
this.repeatedValueCount = 1;
} else {
this.repeatedValueCount++;
}
}
}
}
}