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markt-asf pushed a commit to branch 11.0.x
in repository https://gitbox.apache.org/repos/asf/tomcat.git
The following commit(s) were added to refs/heads/11.0.x by this push:
new 2ceae8fb1a Ensure evictions from the static resource cache are in the
correct order
2ceae8fb1a is described below
commit 2ceae8fb1a2114c5053fefca6537554fea4bf7e7
Author: Mark Thomas <[email protected]>
AuthorDate: Thu Sep 3 09:18:58 2026 +0100
Ensure evictions from the static resource cache are in the correct order
---
java/org/apache/catalina/webresources/Cache.java | 10 ++++++----
.../apache/catalina/webresources/CachedResource.java | 20 +++++++++++++++-----
webapps/docs/changelog.xml | 4 ++++
3 files changed, 25 insertions(+), 9 deletions(-)
diff --git a/java/org/apache/catalina/webresources/Cache.java
b/java/org/apache/catalina/webresources/Cache.java
index f1b1076ea3..55ce6b649f 100644
--- a/java/org/apache/catalina/webresources/Cache.java
+++ b/java/org/apache/catalina/webresources/Cache.java
@@ -72,8 +72,9 @@ public class Cache {
/**
* Retrieves a single resource from the cache.
*
- * @param path resource path
+ * @param path resource path
* @param useClassLoaderResources whether to use class loader resources
+ *
* @return the web resource
*/
protected WebResource getResource(String path, boolean
useClassLoaderResources) {
@@ -170,8 +171,9 @@ public class Cache {
/**
* Retrieves multiple resources from the cache.
*
- * @param path resource path
+ * @param path resource path
* @param useClassLoaderResources whether to use class loader resources
+ *
* @return the web resources
*/
protected WebResource[] getResources(String path, boolean
useClassLoaderResources) {
@@ -243,8 +245,8 @@ public class Cache {
// Create an ordered set of all cached resources with the least
recently
// used first. This is a background process so we can afford to take
the
// time to order the elements first
- TreeSet<CachedResource> orderedResources =
- new
TreeSet<>(Comparator.comparingLong(CachedResource::getNextCheck));
+ TreeSet<CachedResource> orderedResources = new TreeSet<>(
+
Comparator.comparingLong(CachedResource::getNextCheck).thenComparingLong(CachedResource::getUniqueId));
orderedResources.addAll(resourceCache.values());
Iterator<CachedResource> iter = orderedResources.iterator();
diff --git a/java/org/apache/catalina/webresources/CachedResource.java
b/java/org/apache/catalina/webresources/CachedResource.java
index 6326fde8b6..09ff1fb7be 100644
--- a/java/org/apache/catalina/webresources/CachedResource.java
+++ b/java/org/apache/catalina/webresources/CachedResource.java
@@ -33,6 +33,7 @@ import java.text.Collator;
import java.util.Arrays;
import java.util.Locale;
import java.util.Objects;
+import java.util.concurrent.atomic.AtomicLong;
import java.util.jar.JarFile;
import java.util.jar.Manifest;
@@ -57,6 +58,10 @@ public class CachedResource implements WebResource {
// based on profiler data.
private static final long CACHE_ENTRY_SIZE = 500;
+ // The ordering process in cache eviction requires a unique ID for each
cached resource
+ private static final AtomicLong uniqueIdSource = new AtomicLong(0);
+ private final long uniqueId = uniqueIdSource.getAndIncrement();
+
private final Cache cache;
private final StandardRoot root;
private final String webAppPath;
@@ -82,11 +87,11 @@ public class CachedResource implements WebResource {
/**
* Construct a cached resource.
*
- * @param cache The cache
- * @param root The standard root
- * @param path The web application path
- * @param ttl The time to live in milliseconds
- * @param objectMaxSizeBytes The maximum size of objects to cache
+ * @param cache The cache
+ * @param root The standard root
+ * @param path The web application path
+ * @param ttl The time to live in milliseconds
+ * @param objectMaxSizeBytes The maximum size of objects to cache
* @param usesClassLoaderResources Whether class loader resources are used
*/
public CachedResource(Cache cache, StandardRoot root, String path, long
ttl, int objectMaxSizeBytes,
@@ -460,6 +465,11 @@ public class CachedResource implements WebResource {
}
+ long getUniqueId() {
+ return uniqueId;
+ }
+
+
/*
* Mimics the behaviour of FileURLConnection.getInputStream for a
directory. Deliberately uses default locale.
*/
diff --git a/webapps/docs/changelog.xml b/webapps/docs/changelog.xml
index 471227326b..eb2eb8aced 100644
--- a/webapps/docs/changelog.xml
+++ b/webapps/docs/changelog.xml
@@ -179,6 +179,10 @@
<fix>
WAR URLConnection should propagate use of caching. (remm)
</fix>
+ <fix>
+ Ensure resources are evicted from the static resource cache in the
+ correct order. (markt)
+ </fix>
</changelog>
</subsection>
<subsection name="Coyote">
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