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Apache Geode provides a database-like consistency model, reliable transaction processing and a shared-nothing architecture to maintain very low latency performance with high concurrency processing
/*
* 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.geode.internal.statistics;
import org.apache.geode.*;
import org.apache.geode.internal.OSProcess;
import org.apache.geode.internal.statistics.StatisticsImpl;
import org.apache.geode.internal.statistics.StatisticsManager;
import org.apache.geode.internal.statistics.StatisticsTypeImpl;
// import org.apache.geode.util.IntArray;
// import org.apache.geode.util.LongArray;
/**
* An implementation of {@link Statistics} that stores its statistics in local java memory.
*
* @see Package introduction
*
*
* @since GemFire 3.0
*
*/
public class LocalStatisticsImpl extends StatisticsImpl {
/** In JOM Statistics, the values of the int statistics */
private final int[] intStorage;
/** In JOM Statistics, the values of the long statistics */
private final long[] longStorage;
/** In JOM Statistics, the values of the double statistics */
private final double[] doubleStorage;
/**
* An array containing the JOM object used to lock a int statistic when it is incremented.
*/
private transient final Object[] intLocks;
/**
* An array containing the JOM object used to lock a long statistic when it is incremented.
*/
private transient final Object[] longLocks;
/**
* An array containing the JOM object used to lock a double statistic when it is incremented.
*/
private transient final Object[] doubleLocks;
/** The StatisticsFactory that created this instance */
private final StatisticsManager dSystem;
/////////////////////// Constructors ///////////////////////
/**
* Creates a new statistics instance of the given type
*
* @param type A description of the statistics
* @param textId Text that identifies this statistic when it is monitored
* @param numericId A number that displayed when this statistic is monitored
* @param uniqueId A number that uniquely identifies this instance
* @param atomicIncrements Are increment operations atomic? If only one application thread
* increments a statistic, then a false value may yield better performance.
* @param osStatFlags Non-zero if stats require system calls to collect them; for internal use
* only
* @param system The distributed system that determines whether or not these statistics are stored
* (and collected) in GemFire shared memory or in the local VM
*/
public LocalStatisticsImpl(StatisticsType type, String textId, long numericId, long uniqueId,
boolean atomicIncrements, int osStatFlags, StatisticsManager system) {
super(type, calcTextId(system, textId), calcNumericId(system, numericId), uniqueId,
osStatFlags);
this.dSystem = system;
StatisticsTypeImpl realType = (StatisticsTypeImpl) type;
int intCount = realType.getIntStatCount();
int longCount = realType.getLongStatCount();
int doubleCount = realType.getDoubleStatCount();
if (intCount > 0) {
this.intStorage = new int[intCount];
if (atomicIncrements) {
this.intLocks = new Object[intCount];
for (int i = 0; i < intLocks.length; i++) {
intLocks[i] = new Object();
}
} else {
this.intLocks = null;
}
} else {
this.intStorage = null;
this.intLocks = null;
}
if (longCount > 0) {
this.longStorage = new long[longCount];
if (atomicIncrements) {
this.longLocks = new Object[longCount];
for (int i = 0; i < longLocks.length; i++) {
longLocks[i] = new Object();
}
} else {
this.longLocks = null;
}
} else {
this.longStorage = null;
this.longLocks = null;
}
if (doubleCount > 0) {
this.doubleStorage = new double[doubleCount];
if (atomicIncrements) {
this.doubleLocks = new Object[doubleCount];
for (int i = 0; i < doubleLocks.length; i++) {
doubleLocks[i] = new Object();
}
} else {
this.doubleLocks = null;
}
} else {
this.doubleStorage = null;
this.doubleLocks = null;
}
}
////////////////////// Static Methods //////////////////////
private static long calcNumericId(StatisticsManager system, long userValue) {
if (userValue != 0) {
return userValue;
} else {
long result = OSProcess.getId(); // fix for bug 30239
if (result == 0) {
if (system != null) {
result = system.getId();
}
}
return result;
}
}
private static String calcTextId(StatisticsManager system, String userValue) {
if (userValue != null && !userValue.equals("")) {
return userValue;
} else {
if (system != null) {
return system.getName();
} else {
return "";
}
}
}
////////////////////// Instance Methods //////////////////////
@Override
public final boolean isAtomic() {
return intLocks != null || longLocks != null || doubleLocks != null;
}
@Override
public void close() {
super.close();
if (this.dSystem != null) {
dSystem.destroyStatistics(this);
}
}
//////////////////////// store() Methods ///////////////////////
@Override
protected final void _setInt(int offset, int value) {
this.intStorage[offset] = value;
}
@Override
protected final void _setLong(int offset, long value) {
this.longStorage[offset] = value;
}
@Override
protected final void _setDouble(int offset, double value) {
this.doubleStorage[offset] = value;
}
/////////////////////// get() Methods ///////////////////////
@Override
protected final int _getInt(int offset) {
return this.intStorage[offset];
}
@Override
protected final long _getLong(int offset) {
return this.longStorage[offset];
}
@Override
protected final double _getDouble(int offset) {
return this.doubleStorage[offset];
}
//////////////////////// inc() Methods ////////////////////////
@Override
protected final void _incInt(int offset, int delta) {
if (this.intLocks != null) {
synchronized (this.intLocks[offset]) {
this.intStorage[offset] += delta;
}
} else {
this.intStorage[offset] += delta;
}
}
@Override
protected final void _incLong(int offset, long delta) {
if (this.longLocks != null) {
synchronized (this.longLocks[offset]) {
this.longStorage[offset] += delta;
}
} else {
this.longStorage[offset] += delta;
}
}
@Override
protected final void _incDouble(int offset, double delta) {
if (this.doubleLocks != null) {
synchronized (this.doubleLocks[offset]) {
this.doubleStorage[offset] += delta;
}
} else {
this.doubleStorage[offset] += delta;
}
}
/////////////////// internal package methods //////////////////
final int[] _getIntStorage() {
return this.intStorage;
}
final long[] _getLongStorage() {
return this.longStorage;
}
final double[] _getDoubleStorage() {
return this.doubleStorage;
}
}