On Mon, Nov 27, 2023 at 7:29 PM <[email protected]> wrote:
>
> This is an automated email from the ASF dual-hosted git repository.
>
> markt pushed a commit to branch 8.5.x
> in repository https://gitbox.apache.org/repos/asf/tomcat.git
>
> commit 8df7a3a95babb12fc38b8efa7eb938877ef38485
> Author: Mark Thomas <[email protected]>
> AuthorDate: Mon Nov 27 14:01:49 2023 +0000
>
> Fix BZ 68119 - Refactor for improved performance during type conversion
>
> https://bz.apache.org/bugzilla/show_bug.cgi?id=68119
> ---
> java/javax/el/CompositeELResolver.java | 47
> +++++++++++++++++++++++++++++++---
> webapps/docs/changelog.xml | 8 ++++++
> 2 files changed, 52 insertions(+), 3 deletions(-)
>
> diff --git a/java/javax/el/CompositeELResolver.java
> b/java/javax/el/CompositeELResolver.java
> index ee14d6bcc3..2280f9a805 100644
> --- a/java/javax/el/CompositeELResolver.java
> +++ b/java/javax/el/CompositeELResolver.java
> @@ -17,13 +17,16 @@
> package javax.el;
>
> import java.beans.FeatureDescriptor;
> +import java.util.HashSet;
> import java.util.Iterator;
> import java.util.NoSuchElementException;
> import java.util.Objects;
> +import java.util.Set;
>
> public class CompositeELResolver extends ELResolver {
>
> private static final Class<?> SCOPED_ATTRIBUTE_EL_RESOLVER;
> + private static final Set<String> KNOWN_NON_TYPE_CONVERTING_RESOLVERS =
> new HashSet<>();
> static {
> Class<?> clazz = null;
> try {
> @@ -32,15 +35,39 @@ public class CompositeELResolver extends ELResolver {
> // Ignore. This is expected if using the EL stand-alone
> }
> SCOPED_ATTRIBUTE_EL_RESOLVER = clazz;
> +
> + // EL API Resolvers
> +
> KNOWN_NON_TYPE_CONVERTING_RESOLVERS.add(ArrayELResolver.class.getName());
> +
> KNOWN_NON_TYPE_CONVERTING_RESOLVERS.add(BeanELResolver.class.getName());
> +
> KNOWN_NON_TYPE_CONVERTING_RESOLVERS.add(BeanNameELResolver.class.getName());
> +
> KNOWN_NON_TYPE_CONVERTING_RESOLVERS.add(ListELResolver.class.getName());
> +
> KNOWN_NON_TYPE_CONVERTING_RESOLVERS.add(MapELResolver.class.getName());
> +
> KNOWN_NON_TYPE_CONVERTING_RESOLVERS.add(ResourceBundleELResolver.class.getName());
> +
> KNOWN_NON_TYPE_CONVERTING_RESOLVERS.add(StaticFieldELResolver.class.getName());
> + // JSP API Resolvers - referenced by name to avoid creating
> dependency
> +
> KNOWN_NON_TYPE_CONVERTING_RESOLVERS.add("jakarta.servlet.jsp.el.ImplicitObjectELResolver");
> +
> KNOWN_NON_TYPE_CONVERTING_RESOLVERS.add("jakarta.servlet.jsp.el.ScopedAttributeELResolver");
> + // Tomcat internal resolvers - referenced by name to avoid creating
> dependency
> +
> KNOWN_NON_TYPE_CONVERTING_RESOLVERS.add("org.apache.jasper.el.JasperELResolver$GraalBeanELResolver");
It's not there in 8.5.
Rémy
> +
> KNOWN_NON_TYPE_CONVERTING_RESOLVERS.add("org.apache.el.stream.StreamELResolverImpl");
> }
>
> private int resolversSize;
> -
> private ELResolver[] resolvers;
>
> + /*
> + * Use a separate array for ELResolvers that might implement type
> conversion as a performance optimisation. See
> + * https://bz.apache.org/bugzilla/show_bug.cgi?id=68119
> + */
> + private int typeConvertersSize;
> + private ELResolver[] typeConverters;
> +
> public CompositeELResolver() {
> resolversSize = 0;
> resolvers = new ELResolver[8];
> +
> + typeConvertersSize = 0;
> + typeConverters = new ELResolver[0];
> }
>
> public void add(ELResolver elResolver) {
> @@ -56,6 +83,20 @@ public class CompositeELResolver extends ELResolver {
> resolvers = nr;
> }
> resolvers[resolversSize++] = elResolver;
> +
> + if
> (KNOWN_NON_TYPE_CONVERTING_RESOLVERS.contains(elResolver.getClass().getName()))
> {
> + // Performance optimisation. ELResolver known not to perform
> type conversion
> + return;
> + }
> +
> + if (typeConvertersSize == 0) {
> + typeConverters = new ELResolver[1];
> + } else if (typeConvertersSize == typeConverters.length) {
> + ELResolver[] expandedTypeConverters = new
> ELResolver[typeConvertersSize * 2];
> + System.arraycopy(typeConverters, 0, expandedTypeConverters, 0,
> typeConvertersSize);
> + typeConverters = expandedTypeConverters;
> + }
> + typeConverters[typeConvertersSize++] = elResolver;
> }
>
> @Override
> @@ -153,9 +194,9 @@ public class CompositeELResolver extends ELResolver {
> @Override
> public Object convertToType(ELContext context, Object obj, Class<?>
> type) {
> context.setPropertyResolved(false);
> - int sz = this.resolversSize;
> + int sz = typeConvertersSize;
> for (int i = 0; i < sz; i++) {
> - Object result = this.resolvers[i].convertToType(context, obj,
> type);
> + Object result = this.typeConverters[i].convertToType(context,
> obj, type);
> if (context.isPropertyResolved()) {
> return result;
> }
> diff --git a/webapps/docs/changelog.xml b/webapps/docs/changelog.xml
> index 6a2ca0de2f..1fc5a0ec38 100644
> --- a/webapps/docs/changelog.xml
> +++ b/webapps/docs/changelog.xml
> @@ -113,6 +113,14 @@
> </fix>
> </changelog>
> </subsection>
> + <subsection name="Jasper">
> + <changelog>
> + <scode>
> + <bug>68119</bug>: Refactor the <code>CompositeELResolver</code> to
> + improve performance during type conversion operations. (markt)
> + </scode>
> + </changelog>
> + </subsection>
> </section>
> <section name="Tomcat 8.5.96 (schultz)" rtext="Release in progres">
> <subsection name="Catalina">
>
>
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