Author: kkolinko
Date: Wed Apr 18 20:34:02 2012
New Revision: 1327670
URL: http://svn.apache.org/viewvc?rev=1327670&view=rev
Log:
Save a bit of memory in annotations cache in DefaultInstanceManager
occupied by unused entries in annotation lists.
I could do the same by calling ArrayList.trimToSize(), preserving the Lists
abstraction, but
1). That involves the same array copying operation as toArray() call that I am
using,
2). I do not see any benefits from using List here, as the only operation with
annotations
list after it has been created is iterating over it.
Thus I preferred to replace lists with explicit arrays.
Modified:
tomcat/trunk/java/org/apache/catalina/core/DefaultInstanceManager.java
Modified: tomcat/trunk/java/org/apache/catalina/core/DefaultInstanceManager.java
URL:
http://svn.apache.org/viewvc/tomcat/trunk/java/org/apache/catalina/core/DefaultInstanceManager.java?rev=1327670&r1=1327669&r2=1327670&view=diff
==============================================================================
--- tomcat/trunk/java/org/apache/catalina/core/DefaultInstanceManager.java
(original)
+++ tomcat/trunk/java/org/apache/catalina/core/DefaultInstanceManager.java Wed
Apr 18 20:34:02 2012
@@ -30,7 +30,6 @@ import java.security.PrivilegedAction;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;
import java.util.ArrayList;
-import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.Properties;
@@ -69,8 +68,12 @@ public class DefaultInstanceManager impl
private final Properties restrictedFilters = new Properties();
private final Properties restrictedListeners = new Properties();
private final Properties restrictedServlets = new Properties();
- private final Map<Class<?>,List<AnnotationCacheEntry>> annotationCache =
- new WeakHashMap<Class<?>, List<AnnotationCacheEntry>>();
+ private final Map<Class<?>, AnnotationCacheEntry[]> annotationCache =
+ new WeakHashMap<Class<?>, AnnotationCacheEntry[]>();
+
+ // Used when there are no annotations in a class
+ private static final AnnotationCacheEntry[] ANNOTATIONS_EMPTY
+ = new AnnotationCacheEntry[0];
public DefaultInstanceManager(Context context, Map<String, Map<String,
String>> injectionMap, org.apache.catalina.Context catalinaContext, ClassLoader
containerClassLoader) {
classLoader = catalinaContext.getLoader().getClassLoader();
@@ -177,7 +180,7 @@ public class DefaultInstanceManager impl
// At the end the postconstruct annotated
// method is invoked
- List<AnnotationCacheEntry> annotations;
+ AnnotationCacheEntry[] annotations;
synchronized (annotationCache) {
annotations = annotationCache.get(clazz);
}
@@ -213,7 +216,7 @@ public class DefaultInstanceManager impl
// At the end the postconstruct annotated
// method is invoked
- List<AnnotationCacheEntry> annotations = null;
+ AnnotationCacheEntry[] annotations = null;
synchronized (annotationCache) {
annotations = annotationCache.get(clazz);
}
@@ -251,13 +254,19 @@ public class DefaultInstanceManager impl
Map<String, String> injections) throws IllegalAccessException,
InvocationTargetException, NamingException {
+ List<AnnotationCacheEntry> annotations = null;
+
while (clazz != null) {
- List<AnnotationCacheEntry> annotations = null;
+ AnnotationCacheEntry[] annotationsArray = null;
synchronized (annotationCache) {
- annotations = annotationCache.get(clazz);
+ annotationsArray = annotationCache.get(clazz);
}
- if (annotations == null) {
- annotations = new ArrayList<AnnotationCacheEntry>();
+ if (annotationsArray == null) {
+ if (annotations == null) {
+ annotations = new ArrayList<AnnotationCacheEntry>();
+ } else {
+ annotations.clear();
+ }
if (context != null) {
// Initialize fields annotations for resource injection if
@@ -421,12 +430,15 @@ public class DefaultInstanceManager impl
preDestroy.getParameterTypes(), null,
AnnotationCacheEntryType.PRE_DESTROY));
}
- if (annotations.size() == 0) {
- // Use common empty list to save memory
- annotations = Collections.emptyList();
+ if (annotations.isEmpty()) {
+ // Use common object to save memory
+ annotationsArray = ANNOTATIONS_EMPTY;
+ } else {
+ annotationsArray = annotations.toArray(
+ new AnnotationCacheEntry[annotations.size()]);
}
synchronized (annotationCache) {
- annotationCache.put(clazz, annotations);
+ annotationCache.put(clazz, annotationsArray);
}
}
clazz = clazz.getSuperclass();
@@ -455,7 +467,7 @@ public class DefaultInstanceManager impl
Class<?> clazz = instance.getClass();
while (clazz != null) {
- List<AnnotationCacheEntry> annotations;
+ AnnotationCacheEntry[] annotations;
synchronized (annotationCache) {
annotations = annotationCache.get(clazz);
}
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