java:lazy_evaluation

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--- java:lazy_evaluation [2020/05/18 17:41]
kwon37xi
+++ java:lazy_evaluation [2020/05/19 09:28]
kwon37xi
@@ 줄 4: / 줄 4: @@
     * [[https://github.com/pivovarit/articles/tree/master/java-lazy-initialization|articles/java-lazy-initialization at master · pivovarit/articles]]
   * [[java:guava:supplier|Guava Supplier]]
+  * [[https://commons.apache.org/proper/commons-lang/javadocs/api-release/org/apache/commons/lang3/concurrent/LazyInitializer.html|LazyInitializer (Apache Commons Lang 3.10 API)]]
 ===== Effective Java 3rd Item 83 - double check =====
@@ 줄 9: / 줄 10: @@
   * [[https://github.com/jbloch/effective-java-3e-source-code/issues/8|Double-check idiom for lazy initialization of instance fields. Broken example. · Issue #8 · jbloch/effective-java-3e-source-code]]
 <code java>
-    // Double-check idiom for lazy initialization of instance fields - Page 334
+// Double-check idiom for lazy initialization of instance fields - Page 334
-    private volatile FieldType field4;
+private volatile FieldType field4;
-    // NOTE: The code for this method in the first printing had a serious error (see errata for details)!
+// NOTE: The code for this method in the first printing had a serious error (see errata for details)!
-    private FieldType getField4() {
+private FieldType getField4() {
-        FieldType result = field4;
+    FieldType result = field4;
-        if (result != null) // First check (no locking)
+    if (result != null) // First check (no locking)
-            return result;
+        return result;
-        synchronized(this) {
+    synchronized(this) {
-            if (field4 == null) // Second check (with locking)
+        if (field4 == null) // Second check (with locking)
-                field4 = computeFieldValue();
+            field4 = computeFieldValue();
-            return field4;
+        return field4;
-        }
     }
+}
 </code>

java/lazy_evaluation.txt · 마지막으로 수정됨: 2020/05/19 09:28 저자 kwon37xi