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perf: RegexTools 的缓存改用 guava cache

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zhouxy108 2025-05-01 02:15:23 +08:00
parent af66cd2380
commit 97a4ae2279
1 changed files with 20 additions and 13 deletions
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33
src/main/java/xyz/zhouxy/plusone/commons/util/RegexTools.java
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@ -17,29 +17,40 @@
package xyz.zhouxy.plusone.commons.util;
import java.util.Arrays;
import java.util.Map;
import java.util.Objects;
import java.util.Optional;
import java.util.concurrent.ConcurrentHashMap;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import com.google.common.cache.CacheBuilder;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.LoadingCache;
/**
* 封装一些常用的正则操作，并可以缓存 {@link Pattern} 实例以复用（最多缓存大概 256 个）。
* 封装一些常用的正则操作，并可以缓存 {@link Pattern} 实例以复用。
*
* @author <a href="http://zhouxy.xyz:3000/ZhouXY108">ZhouXY</a>
*
*/
public final class RegexTools {
private static final int DEFAULT_CACHE_INITIAL_CAPACITY = 64;
private static final int MAX_CACHE_SIZE = 256;
private static final int DEFAULT_FLAG = 0;
private static final Map<RegexAndFlags, Pattern> PATTERN_CACHE
= new ConcurrentHashMap<>(DEFAULT_CACHE_INITIAL_CAPACITY);
private static final LoadingCache<RegexAndFlags, Pattern> PATTERN_CACHE = CacheBuilder
.newBuilder()
.maximumSize(MAX_CACHE_SIZE)
.build(new CacheLoader<RegexAndFlags, Pattern>() {
@SuppressWarnings("null")
public Pattern load(@Nonnull RegexAndFlags regexAndFlags) {
return regexAndFlags.compilePattern();
}
});
// ================================
// #region - getPattern
// ================================
/**
* 获取 {@link Pattern} 实例。
@ -273,11 +284,7 @@ public final class RegexTools {
@Nonnull
private static Pattern cacheAndGetPatternInternal(final String pattern, final int flags) {
final RegexAndFlags regexAndFlags = new RegexAndFlags(pattern, flags);
if (PATTERN_CACHE.size() < MAX_CACHE_SIZE) {
return PATTERN_CACHE.computeIfAbsent(regexAndFlags, RegexAndFlags::compilePattern);
}
return Optional.ofNullable(PATTERN_CACHE.get(regexAndFlags))
.orElseGet(regexAndFlags::compilePattern);
return PATTERN_CACHE.getUnchecked(regexAndFlags);
}
/**
@ -290,7 +297,7 @@ public final class RegexTools {
@Nonnull
private static Pattern getPatternInternal(final String pattern, final int flags) {
final RegexAndFlags regexAndFlags = new RegexAndFlags(pattern, flags);
return Optional.ofNullable(PATTERN_CACHE.get(regexAndFlags))
return Optional.ofNullable(PATTERN_CACHE.getIfPresent(regexAndFlags))
.orElseGet(regexAndFlags::compilePattern);
}