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增加模板编译缓存以提升性能 #95

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增加模板编译缓存以提升性能 #95

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09a2a9a
增加模板编译缓存以提升性能
gordianyuan Jul 30, 2025
acd86f7
优化模板编译缓存，使用 SoftReference 实现内存敏感缓存，防止内存溢出
gordianyuan Jul 31, 2025
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19 changes: 18 additions & 1 deletion src/main/java/com/blinkfox/fenix/helper/ParseHelper.java
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Original file line number Diff line number Diff line change
Expand Up @@ -5,7 +5,12 @@
import lombok.NoArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.mvel2.MVEL;
import org.mvel2.templates.CompiledTemplate;
import org.mvel2.templates.TemplateCompiler;
import org.mvel2.templates.TemplateRuntime;
import java.util.Map;
import java.lang.ref.SoftReference;
import java.util.concurrent.ConcurrentHashMap;

/**
* MVEL 表达式解析相关的工具类.
Expand All @@ -17,6 +22,12 @@
@NoArgsConstructor(access = AccessLevel.PRIVATE)
public final class ParseHelper {

/**
* 模板编译缓存，使用 SoftReference 实现内存敏感缓存.
* 当内存不足时，JVM 会回收软引用，防止内存溢出.
*/
private static final Map<String, SoftReference<CompiledTemplate>> TEMPLATE_CACHE = new ConcurrentHashMap<>();

/**
* 通过 MVEL 来解析表达式的值，该方法如果解析出错也不抛出异常.
*
Expand Down Expand Up @@ -57,7 +68,13 @@ public static Object parseExpressWithException(String exp, Object context) {
*/
public static String parseTemplate(String template, Object context) {
try {
return (String) TemplateRuntime.eval(template, context);
SoftReference<CompiledTemplate> ref = TEMPLATE_CACHE.get(template);
CompiledTemplate compiledTemplate = ref != null ? ref.get() : null;
if (compiledTemplate == null) {
compiledTemplate = TemplateCompiler.compileTemplate(template);
TEMPLATE_CACHE.put(template, new SoftReference<>(compiledTemplate));
}
return (String) TemplateRuntime.execute(compiledTemplate, context);
} catch (Exception e) {
throw new ParseExpressionException("【Fenix 异常提示】解析模板异常，解析出错的模板为:【" + template + "】.", e);
}
Expand Down