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-rw-r--r--sangria-lazy/src/main/java/com/tavianator/sangria/lazy/Lazy.java11
1 files changed, 7 insertions, 4 deletions
diff --git a/sangria-lazy/src/main/java/com/tavianator/sangria/lazy/Lazy.java b/sangria-lazy/src/main/java/com/tavianator/sangria/lazy/Lazy.java
index adf531c..ee42a2f 100644
--- a/sangria-lazy/src/main/java/com/tavianator/sangria/lazy/Lazy.java
+++ b/sangria-lazy/src/main/java/com/tavianator/sangria/lazy/Lazy.java
@@ -56,8 +56,10 @@ import javax.inject.Provider;
* @since 1.2
*/
public final class Lazy<T> {
+ private static final Object SENTINEL = new Object();
+
private final Provider<T> provider;
- private volatile T instance = null;
+ private volatile Object instance = SENTINEL;
@Inject
Lazy(Provider<T> provider) {
@@ -67,15 +69,16 @@ public final class Lazy<T> {
/**
* @return A lazily-produced value of type {@code T}.
*/
+ @SuppressWarnings("unchecked")
public T get() {
// Double-checked locking
- if (instance == null) {
+ if (instance == SENTINEL) {
synchronized (this) {
- if (instance == null) {
+ if (instance == SENTINEL) {
instance = provider.get();
}
}
}
- return instance;
+ return (T) instance;
}
}