Polish concurrent gaugeLocks map access

See gh-1995

Polish concurrent gaugeLocks map access
See gh-1995
41c15f20 · Phillip Webb · b519eda4 · 41c15f20
Commit 41c15f20 authored Dec 01, 2014 by Phillip Webb
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CodahaleMetricWriter.java ...ork/boot/actuate/metrics/writer/CodahaleMetricWriter.java +3 -2

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--- a/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/metrics/writer/CodahaleMetricWriter.java
+++ b/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/metrics/writer/CodahaleMetricWriter.java
@@ -103,8 +103,9 @@ public class CodahaleMetricWriter implements MetricWriter {
 	private Object getGuageLock(String name) {
 		Object lock = this.gaugeLocks.get(name);
 		if (lock == null) {
-			this.gaugeLocks.putIfAbsent(name, new Object());
+			Object newLock = new Object();
-			lock = this.gaugeLocks.get(name);
+			lock = this.gaugeLocks.putIfAbsent(name, newLock);
+			lock = (lock == null ? newLock : lock);
 		}
 		return lock;
 	}