org.forstdb.Statistics Maven / Gradle / Ivy
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// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
// This source code is licensed under both the GPLv2 (found in the
// COPYING file in the root directory) and Apache 2.0 License
// (found in the LICENSE.Apache file in the root directory).
package org.forstdb;
import java.util.EnumSet;
/**
* Statistics to analyze the performance of a db. Pointer for statistics object
* is managed by Options class.
*/
public class Statistics extends RocksObject {
public Statistics() {
super(newStatisticsInstance());
}
public Statistics(final Statistics otherStatistics) {
super(newStatistics(otherStatistics.nativeHandle_));
}
public Statistics(final EnumSet ignoreHistograms) {
super(newStatisticsInstance(toArrayValues(ignoreHistograms)));
}
public Statistics(final EnumSet ignoreHistograms, final Statistics otherStatistics) {
super(newStatistics(toArrayValues(ignoreHistograms), otherStatistics.nativeHandle_));
}
/**
* Intentionally package-private.
*
* Used from {@link DBOptions#statistics()}
*
* @param existingStatisticsHandle The C++ pointer to an existing statistics object
*/
Statistics(final long existingStatisticsHandle) {
super(existingStatisticsHandle);
}
private static byte[] toArrayValues(final EnumSet histogramTypes) {
final byte[] values = new byte[histogramTypes.size()];
int i = 0;
for(final HistogramType histogramType : histogramTypes) {
values[i++] = histogramType.getValue();
}
return values;
}
/**
* Gets the current stats level.
*
* @return The stats level.
*/
public StatsLevel statsLevel() {
return StatsLevel.getStatsLevel(statsLevel(nativeHandle_));
}
/**
* Sets the stats level.
*
* @param statsLevel The stats level to set.
*/
public void setStatsLevel(final StatsLevel statsLevel) {
setStatsLevel(nativeHandle_, statsLevel.getValue());
}
/**
* Get the count for a ticker.
*
* @param tickerType The ticker to get the count for
*
* @return The count for the ticker
*/
public long getTickerCount(final TickerType tickerType) {
assert(isOwningHandle());
return getTickerCount(nativeHandle_, tickerType.getValue());
}
/**
* Get the count for a ticker and reset the tickers count.
*
* @param tickerType The ticker to get the count for
*
* @return The count for the ticker
*/
public long getAndResetTickerCount(final TickerType tickerType) {
assert(isOwningHandle());
return getAndResetTickerCount(nativeHandle_, tickerType.getValue());
}
/**
* Gets the histogram data for a particular histogram.
*
* @param histogramType The histogram to retrieve the data for
*
* @return The histogram data
*/
public HistogramData getHistogramData(final HistogramType histogramType) {
assert(isOwningHandle());
return getHistogramData(nativeHandle_, histogramType.getValue());
}
/**
* Gets a string representation of a particular histogram.
*
* @param histogramType The histogram to retrieve the data for
*
* @return A string representation of the histogram data
*/
public String getHistogramString(final HistogramType histogramType) {
assert(isOwningHandle());
return getHistogramString(nativeHandle_, histogramType.getValue());
}
/**
* Resets all ticker and histogram stats.
*
* @throws RocksDBException if an error occurs when resetting the statistics.
*/
public void reset() throws RocksDBException {
assert(isOwningHandle());
reset(nativeHandle_);
}
/**
* String representation of the statistic object.
*/
@Override
public String toString() {
assert(isOwningHandle());
return toString(nativeHandle_);
}
private static long newStatisticsInstance() {
RocksDB.loadLibrary();
return newStatistics();
}
private static native long newStatistics();
private static native long newStatistics(final long otherStatisticsHandle);
private static long newStatisticsInstance(final byte[] ignoreHistograms) {
RocksDB.loadLibrary();
return newStatistics(ignoreHistograms);
}
private static native long newStatistics(final byte[] ignoreHistograms);
private static native long newStatistics(
final byte[] ignoreHistograms, final long otherStatisticsHandle);
@Override protected final native void disposeInternal(final long handle);
private native byte statsLevel(final long handle);
private native void setStatsLevel(final long handle, final byte statsLevel);
private native long getTickerCount(final long handle, final byte tickerType);
private native long getAndResetTickerCount(final long handle, final byte tickerType);
private native HistogramData getHistogramData(final long handle, final byte histogramType);
private native String getHistogramString(final long handle, final byte histogramType);
private native void reset(final long nativeHandle) throws RocksDBException;
private native String toString(final long nativeHandle);
}