meszibalu commented on a change in pull request #2685:
URL: https://github.com/apache/hbase/pull/2685#discussion_r527938826
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File path: hbase-client/src/main/java/org/apache/hadoop/hbase/util/PoolMap.java
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@@ -275,43 +272,70 @@ public static PoolType fuzzyMatch(String name) {
*
*/
@SuppressWarnings("serial")
- static class RoundRobinPool<R> extends CopyOnWriteArrayList<R> implements
Pool<R> {
- private int maxSize;
- private int nextResource = 0;
+ static class RoundRobinPool<R> implements Pool<R> {
+ private final List<R> resources;
+ private final int maxSize;
+
+ private int nextIndex;
public RoundRobinPool(int maxSize) {
+ if (maxSize <= 0) {
+ throw new IllegalArgumentException("maxSize must be positive");
+ }
+
+ resources = new ArrayList<>(maxSize);
this.maxSize = maxSize;
}
@Override
- public R put(R resource) {
- if (super.size() < maxSize) {
- add(resource);
+ public R get() {
+ int size = resources.size();
+
+ /* letting pool to grow */
+ if (size < maxSize) {
+ return null;
}
+
+ R resource = resources.get(nextIndex);
+
+ /* at this point size cannot be 0 */
+ nextIndex = (nextIndex + 1) % size;
+
+ return resource;
+ }
+
+ @Override
+ public R put(R resource) {
+ resources.add(resource);
Review comment:
It was because of the `Map` conformity.
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