[logging-log4j2] 01/03: Only check if log4j-core is available once.

[gg...@apache.org]

This is an automated email from the ASF dual-hosted git repository.

ggregory pushed a commit to branch release-2.x
in repository https://gitbox.apache.org/repos/asf/logging-log4j2.git

commit c61ec4abeee445b7448dfc8bc670ceebab575aee
Author: Gary Gregory <ga...@gmail.com>
AuthorDate: Sat Jan 8 14:48:42 2022 -0500

    Only check if log4j-core is available once.
---
 .../src/main/java/org/apache/log4j/spi/Filter.java | 25 +++++++++++++++-------
 1 file changed, 17 insertions(+), 8 deletions(-)

diff --git a/log4j-1.2-api/src/main/java/org/apache/log4j/spi/Filter.java b/log4j-1.2-api/src/main/java/org/apache/log4j/spi/Filter.java
index 997398b..5cd7189 100644
--- a/log4j-1.2-api/src/main/java/org/apache/log4j/spi/Filter.java
+++ b/log4j-1.2-api/src/main/java/org/apache/log4j/spi/Filter.java
@@ -22,17 +22,24 @@ import org.apache.log4j.bridge.FilterAdapter;
  * @since 0.9.0
  */
 public abstract class Filter {
-    private final FilterAdapter adapter;
 
-    public Filter() {
-        FilterAdapter filterAdapter = null;
+    static {
+        boolean temp;
         try {
-            Class.forName("org.apache.logging.log4j.core.Filter");
-            filterAdapter = new FilterAdapter(this);
-        } catch(ClassNotFoundException ex) {
-            // Ignore the exception. Log4j Core is not present.
+            temp = Class.forName("org.apache.logging.log4j.core.Filter") != null;
+        } catch (Exception e) {
+            temp = false;
         }
-        this.adapter = filterAdapter;
+        isCorePresent = temp;
+    }
+    
+    private final FilterAdapter adapter;
+
+    /**
+     * C
+     */
+    public Filter() {
+        this.adapter = isCorePresent ? new FilterAdapter(this) : null;
     }
 
     /**
@@ -61,6 +68,8 @@ public abstract class Filter {
     @Deprecated
     public Filter next;
 
+    private static final boolean isCorePresent;
+
     /**
      * Usually filters options become active when set. We provide a
      * default do-nothing implementation for convenience.