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Improve performance of ConcurrentReferenceHashMap creation

This commit is contained in:
stsypanov 2018-12-11 18:02:19 +02:00 committed by Juergen Hoeller
parent 93189a6733
commit 112cc70231
1 changed files with 10 additions and 7 deletions
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17
spring-core/src/main/java/org/springframework/util/ConcurrentReferenceHashMap.java
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@ -179,10 +179,13 @@ public class ConcurrentReferenceHashMap<K, V> extends AbstractMap<K, V> implemen
int size = 1 << this.shift; int size = 1 << this.shift;
this.referenceType = referenceType; this.referenceType = referenceType;
int roundedUpSegmentCapacity = (int) ((initialCapacity + size - 1L) / size); int roundedUpSegmentCapacity = (int) ((initialCapacity + size - 1L) / size);
this.segments = (Segment[]) Array.newInstance(Segment.class, size); int initialSize = 1 << calculateShift(roundedUpSegmentCapacity, MAXIMUM_SEGMENT_SIZE);
for (int i = 0; i < this.segments.length; i++) { Segment[] segments = (Segment[]) Array.newInstance(Segment.class, size);
this.segments[i] = new Segment(roundedUpSegmentCapacity); int resizeThreshold = (int) (initialSize * getLoadFactor());
for (int i = 0; i < segments.length; i++) {
segments[i] = new Segment(initialSize, resizeThreshold);
} }
this.segments = segments;
} }
@ -481,11 +484,11 @@ public class ConcurrentReferenceHashMap<K, V> extends AbstractMap<K, V> implemen
*/ */
private int resizeThreshold; private int resizeThreshold;
public Segment(int initialCapacity) { public Segment(int initialSize, int resizeThreshold) {
this.referenceManager = createReferenceManager(); this.referenceManager = createReferenceManager();
this.initialSize = 1 << calculateShift(initialCapacity, MAXIMUM_SEGMENT_SIZE); this.initialSize = initialSize;
this.references = createReferenceArray(this.initialSize); this.references = createReferenceArray(initialSize);
this.resizeThreshold = (int) (this.references.length * getLoadFactor()); this.resizeThreshold = resizeThreshold;
} }
@Nullable @Nullable