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/*
* Copyright (c) 2024, Google LLC and others
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Distribution License v. 1.0 which is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
package org.eclipse.jgit.internal.storage.dfs;
import static org.eclipse.jgit.internal.storage.dfs.DfsBlockCacheTable.BlockCacheStats;
import java.util.List;
import org.eclipse.jgit.internal.storage.pack.PackExt;
/**
* Aggregates values for all given {@link BlockCacheStats}.
*/
class AggregatedBlockCacheStats implements BlockCacheStats {
private final List<BlockCacheStats> blockCacheStats;
static BlockCacheStats fromStatsList(
List<BlockCacheStats> blockCacheStats) {
if (blockCacheStats.size() == 1) {
return blockCacheStats.get(0);
}
return new AggregatedBlockCacheStats(blockCacheStats);
}
private AggregatedBlockCacheStats(List<BlockCacheStats> blockCacheStats) {
this.blockCacheStats = blockCacheStats;
}
@Override
public String getName() {
return AggregatedBlockCacheStats.class.getName();
}
@Override
public long[] getCurrentSize() {
long[] sums = emptyPackStats();
for (BlockCacheStats blockCacheStatsEntry : blockCacheStats) {
sums = add(sums, blockCacheStatsEntry.getCurrentSize());
}
return sums;
}
@Override
public long[] getHitCount() {
long[] sums = emptyPackStats();
for (BlockCacheStats blockCacheStatsEntry : blockCacheStats) {
sums = add(sums, blockCacheStatsEntry.getHitCount());
}
return sums;
}
@Override
public long[] getMissCount() {
long[] sums = emptyPackStats();
for (BlockCacheStats blockCacheStatsEntry : blockCacheStats) {
sums = add(sums, blockCacheStatsEntry.getMissCount());
}
return sums;
}
@Override
public long[] getTotalRequestCount() {
long[] sums = emptyPackStats();
for (BlockCacheStats blockCacheStatsEntry : blockCacheStats) {
sums = add(sums, blockCacheStatsEntry.getTotalRequestCount());
}
return sums;
}
@Override
public long[] getHitRatio() {
long[] hit = getHitCount();
long[] miss = getMissCount();
long[] ratio = new long[Math.max(hit.length, miss.length)];
for (int i = 0; i < ratio.length; i++) {
if (i >= hit.length) {
ratio[i] = 0;
} else if (i >= miss.length) {
ratio[i] = 100;
} else {
long total = hit[i] + miss[i];
ratio[i] = total == 0 ? 0 : hit[i] * 100 / total;
}
}
return ratio;
}
@Override
public long[] getEvictions() {
long[] sums = emptyPackStats();
for (BlockCacheStats blockCacheStatsEntry : blockCacheStats) {
sums = add(sums, blockCacheStatsEntry.getEvictions());
}
return sums;
}
private static long[] emptyPackStats() {
return new long[PackExt.values().length];
}
private static long[] add(long[] first, long[] second) {
long[] sums = new long[Integer.max(first.length, second.length)];
int i;
for (i = 0; i < Integer.min(first.length, second.length); i++) {
sums[i] = first[i] + second[i];
}
for (int j = i; j < first.length; j++) {
sums[j] = first[i];
}
for (int j = i; j < second.length; j++) {
sums[j] = second[i];
}
return sums;
}
}
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