java:lazy_evaluation

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--- java:lazy_evaluation [2020/05/18 17:15]
kwon37xi 만듦
+++ java:lazy_evaluation [2020/05/19 09:28] (현재)
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 =====
+  * https://github.com/jbloch/effective-java-3e-source-code/blob/master/src/effectivejava/chapter11/item83/Initialization.java
+  * [[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
+private volatile FieldType field4;
+// NOTE: The code for this method in the first printing had a serious error (see errata for details)!
+private FieldType getField4() {
+    FieldType result = field4;
+    if (result != null) // First check (no locking)
+        return result;
+    synchronized(this) {
+        if (field4 == null) // Second check (with locking)
+            field4 = computeFieldValue();
+        return field4;
+    }
+}
+</code>

java/lazy_evaluation.1589789752.txt.gz · 마지막으로 수정됨: 2020/05/18 17:15 저자 kwon37xi