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From GitBox <...@apache.org>
Subject [GitHub] franz1981 commented on a change in pull request #2548: ARTEMIS-2118 Enhanced Message Groups Support
Date Thu, 14 Feb 2019 09:04:19 GMT
franz1981 commented on a change in pull request #2548: ARTEMIS-2118 Enhanced Message Groups
Support
URL: https://github.com/apache/activemq-artemis/pull/2548#discussion_r256741638
 
 

 ##########
 File path: artemis-commons/src/main/java/org/apache/activemq/artemis/utils/collections/BucketMap.java
 ##########
 @@ -0,0 +1,177 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.activemq.artemis.utils.collections;
+
+import io.netty.util.collection.IntObjectHashMap;
+import io.netty.util.collection.IntObjectMap;
+import java.util.Collection;
+import java.util.Map;
+import java.util.Set;
+import java.util.function.BiConsumer;
+import java.util.function.BiFunction;
+import java.util.function.Function;
+
+/**
+ * BucketMap, stores values against a bucket, where the bucket used is based on the provided
key objects hash.
+ *
+ * As such where keys compute to the same bucket they will act on that stored value, not
the unique specific keys as you'd normally expect from a map.
+ *
+ * The number of buckets is provided at construction.
+ *
+ * Its initial use, is in QueueImpl, where we want to bucket message groups to consumers.
+ *
+ * @param <K> the key type.
+ * @param <V> the value type.
+ */
+public class BucketMap<K, V> implements Map<K, V> {
+
+   private final IntObjectMap<V> buckets = new IntObjectHashMap<>();
 
 Review comment:
   I could implement it on Netty bud, np :)
   
   While about the issue of size...we can just use a null value and lazy initialize it  I
suppose.
   I have done something similar on transactions...

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