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https://issues.apache.org/jira/browse/ARTEMIS-2118?focusedWorklogId=198383&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-198383
]
ASF GitHub Bot logged work on ARTEMIS-2118:
-------------------------------------------
Author: ASF GitHub Bot
Created on: 13/Feb/19 22:50
Start Date: 13/Feb/19 22:50
Worklog Time Spent: 10m
Work Description: michaelandrepearce commented on pull request #2548:
ARTEMIS-2118 Enhanced Message Groups Support
URL: https://github.com/apache/activemq-artemis/pull/2548#discussion_r256623980
##########
File path:
artemis-commons/src/main/java/org/apache/activemq/artemis/utils/collections/IntHashMap.java
##########
@@ -0,0 +1,878 @@
+/*
+ * 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 java.io.Serializable;
+import java.util.AbstractCollection;
+import java.util.AbstractSet;
+import java.util.Arrays;
+import java.util.Iterator;
+import java.util.Map;
+import java.util.NoSuchElementException;
+import java.util.Objects;
+import java.util.function.IntFunction;
+
+import static java.util.Objects.requireNonNull;
+
+/**
+ * {@link java.util.Map} implementation specialised for int keys using open
addressing and
+ * linear probing for cache efficient access.
+ *
+ * @param <V> type of values stored in the {@link java.util.Map}
+ */
+public class IntHashMap<V> implements Map<Integer, V>, Serializable {
+ /**
+ * Default load factor to be used in open addressing hashed data structures.
+ */
+ static final float DEFAULT_LOAD_FACTOR = 0.55f;
+ static final int MIN_CAPACITY = 8;
+
+ private final float loadFactor;
+ private int resizeThreshold;
+ private int size;
+ private final boolean shouldAvoidAllocation;
+
+ private int[] keys;
+ private Object[] values;
+
+ private ValueCollection valueCollection;
+ private KeySet keySet;
+ private EntrySet entrySet;
+
+ public IntHashMap() {
+ this(MIN_CAPACITY, DEFAULT_LOAD_FACTOR, true);
+ }
+
+ public IntHashMap(
+ final int initialCapacity,
+ final float loadFactor) {
+ this(initialCapacity, loadFactor, true);
+ }
+
+ /**
+ * Construct a new map allowing a configuration for initial capacity and
load factor.
+ * @param initialCapacity for the backing array
+ * @param loadFactor limit for resizing on puts
+ * @param shouldAvoidAllocation should allocation be avoided by caching
iterators and map entries.
+ */
+ public IntHashMap(
Review comment:
I actually dont need this class, just realised Netty has one, so can use it.
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Issue Time Tracking
-------------------
Worklog Id: (was: 198383)
Time Spent: 3h 40m (was: 3.5h)
> Enhanced Message Groups Support
> --------------------------------
>
> Key: ARTEMIS-2118
> URL: https://issues.apache.org/jira/browse/ARTEMIS-2118
> Project: ActiveMQ Artemis
> Issue Type: Bug
> Components: Broker
> Reporter: Michael Andre Pearce
> Assignee: Michael Andre Pearce
> Priority: Major
> Time Spent: 3h 40m
> Remaining Estimate: 0h
>
> This ticket is for supporting some Message Group Enhancements.
>
> Currently Artemis implements message groups in a simple way, equivalent to
> SimpleMessageGroupMap in activemq5.
> [http://activemq.apache.org/message-groups.html]
> "SimpleMessageGroupMap keeps track of every group but suffers from unbounded
> memory use."
>
> For use cases migrating from activemq5 its important artemis supports similar
> MessageGroupHashBucked feature.
> "MessageGroupHashBucked keeps track of every group and has bounded memory
> use."
> As such, this JIRA is to add support for being able to enable a semantic
> equivalent to MessageGroupHashBucket from activemq5, at the queue level.
>
> Also currently it is not possible for a specific queue disable grouping, this
> can be useful where a shared address by many queues, where some consumers
> care for ordering and others do not.
> Lastly add an ability to rebalance message groups when a consumer is added,
> this is useful where you want groups more evenly balanced when consumers come
> online, even after dispatching started.
>
>
>
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