{"action":"created","comment":{"url":"https://api.github.com/repos/yahoo/pulsar/pulls/comments/116578980","pull_request_review_id":38210185,"id":116578980,"diff_hunk":"@@ -0,0 +1,524 @@\n+/**\n+ * Copyright 2016 Yahoo Inc.\n+ *\n+ * Licensed under the Apache License, Version 2.0 (the \"License\");\n+ * you may not use this file except in compliance with the License.\n+ * You may obtain a copy of the License at\n+ *\n+ *     http://www.apache.org/licenses/LICENSE-2.0\n+ *\n+ * Unless required by applicable law or agreed to in writing, software\n+ * distributed under the License is distributed on an \"AS IS\" BASIS,\n+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n+ * See the License for the specific language governing permissions and\n+ * limitations under the License.\n+ */\n+package com.yahoo.pulsar.common.util.collections;\n+\n+import static com.google.common.base.Preconditions.checkArgument;\n+\n+import java.util.Arrays;\n+import java.util.HashSet;\n+import java.util.Objects;\n+import java.util.Set;\n+import java.util.concurrent.locks.StampedLock;\n+import java.util.function.Predicate;\n+\n+/**\n+ * Concurrent hash set where values are composed of pairs of longs.\n+ *\n+ ** <p>\n+ * (long,long)\n+ * <p>\n+ * Provides similar methods as a ConcurrentHashSet<V> but since it's an open hash set with linear probing, no node\n+ * allocations are required to store the keys and values, and no boxing is required.\n+ * <p>\n+ * Values <strong>MUST</strong> be >= 0.\n+ */\n+public class ConcurrentLongPairSet {\n+\n+    private static final long EmptyItem = -1L;\n+    private static final long DeletedItem = -2L;\n+\n+    private static final float SetFillFactor = 0.66f;\n+\n+    private static final int DefaultExpectedItems = 256;\n+    private static final int DefaultConcurrencyLevel = 16;\n+\n+    private final Section[] sections;\n+\n+    public static interface ConsumerLong {\n+        void accept(LongPair item);\n+    }\n+\n+    public ConcurrentLongPairSet() {\n+        this(DefaultExpectedItems);\n+    }\n+\n+    public ConcurrentLongPairSet(int expectedItems) {\n+        this(expectedItems, DefaultConcurrencyLevel);\n+    }\n+\n+    public ConcurrentLongPairSet(int expectedItems, int concurrencyLevel) {\n+        checkArgument(expectedItems > 0);\n+        checkArgument(concurrencyLevel > 0);\n+        checkArgument(expectedItems >= concurrencyLevel);\n+\n+        int numSections = concurrencyLevel;\n+        int perSectionExpectedItems = expectedItems / numSections;\n+        int perSectionCapacity = (int) (perSectionExpectedItems / SetFillFactor);\n+        this.sections = new Section[numSections];\n+\n+        for (int i = 0; i < numSections; i++) {\n+            sections[i] = new Section(perSectionCapacity);\n+        }\n+    }\n+\n+    public long size() {\n+        long size = 0;\n+        for (Section s : sections) {\n+            size += s.size;\n+        }\n+        return size;\n+    }\n+\n+    public long capacity() {\n+        long capacity = 0;\n+        for (Section s : sections) {\n+            capacity += s.capacity;\n+        }\n+        return capacity;\n+    }\n+\n+    public boolean isEmpty() {\n+        for (Section s : sections) {\n+            if (s.size != 0) {\n+                return false;\n+            }\n+        }\n+        return true;\n+    }\n+\n+    long getUsedBucketCount() {\n+        long usedBucketCount = 0;\n+        for (Section s : sections) {\n+            usedBucketCount += s.usedBuckets;\n+        }\n+        return usedBucketCount;\n+    }\n+\n+    public boolean contains(long item1, long item2) {\n+        checkBiggerEqualZero(item1);\n+        long h = hash(item1, item2);\n+        return getSection(h).contains(item1, item2, (int) h);\n+    }\n+\n+    public boolean add(long item1, long item2) {\n+        checkBiggerEqualZero(item1);\n+        long h = hash(item1, item2);\n+        return getSection(h).add(item1, item2, (int) h);\n+    }\n+\n+    /**\n+     * Remove an existing entry if found\n+     *\n+     * @param item1\n+     * @return true if removed or false if item was not present\n+     */\n+    public boolean remove(long item1, long item2) {\n+        checkBiggerEqualZero(item1);\n+        long h = hash(item1, item2);\n+        return getSection(h).remove(item1, item2, (int) h);\n+    }\n+\n+    private final Section getSection(long hash) {\n+        // Use 32 msb out of long to get the section\n+        final int sectionIdx = (int) (hash >>> 32) & (sections.length - 1);\n+        return sections[sectionIdx];\n+    }\n+\n+    public void clear() {\n+        for (Section s : sections) {\n+            s.clear();\n+        }\n+    }\n+\n+    public void forEach(ConsumerLong processor) {\n+        for (Section s : sections) {\n+            s.forEach(processor);\n+        }\n+    }\n+\n+    /**\n+     * Removes all of the elements of this collection that satisfy the given predicate.\n+     * \n+     * @param filter\n+     *            a predicate which returns {@code true} for elements to be removed\n+     * @return {@code true} if any elements were removed\n+     * \n+     * @return\n+     */\n+    public boolean removeIf(Predicate<LongPair> filter) {","path":"pulsar-common/src/main/java/com/yahoo/pulsar/common/util/collections/ConcurrentLongPairSet.java","position":161,"original_position":161,"commit_id":"6bb403eaa7633d31d4f63bdfda99630e54033452","original_commit_id":"6bb403eaa7633d31d4f63bdfda99630e54033452","user":{"login":"merlimat","id":62500,"avatar_url":"https://avatars1.githubusercontent.com/u/62500?v=3","gravatar_id":"","url":"https://api.github.com/users/merlimat","html_url":"https://github.com/merlimat","followers_url":"https://api.github.com/users/merlimat/followers","following_url":"https://api.github.com/users/merlimat/following{/other_user}","gists_url":"https://api.github.com/users/merlimat/gists{/gist_id}","starred_url":"https://api.github.com/users/merlimat/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/merlimat/subscriptions","organizations_url":"https://api.github.com/users/merlimat/orgs","repos_url":"https://api.github.com/users/merlimat/repos","events_url":"https://api.github.com/users/merlimat/events{/privacy}","received_events_url":"https://api.github.com/users/merlimat/received_events","type":"User","site_admin":false},"body":"Maybe it would be more meaningful to return the number of removed items","created_at":"2017-05-15T19:23:30Z","updated_at":"2017-05-15T19:37:33Z","html_url":"https://github.com/yahoo/pulsar/pull/405#discussion_r116578980","pull_request_url":"https://api.github.com/repos/yahoo/pulsar/pulls/405","_links":{"self":{"href":"https://api.github.com/repos/yahoo/pulsar/pulls/comments/116578980"},"html":{"href":"https://github.com/yahoo/pulsar/pull/405#discussion_r116578980"},"pull_request":{"href":"https://api.github.com/repos/yahoo/pulsar/pulls/405"}}},"pull_request":{"url":"https://api.github.com/repos/yahoo/pulsar/pulls/405","id":120476346,"html_url":"https://github.com/yahoo/pulsar/pull/405","diff_url":"https://github.com/yahoo/pulsar/pull/405.diff","patch_url":"https://github.com/yahoo/pulsar/pull/405.patch","issue_url":"https://api.github.com/repos/yahoo/pulsar/issues/405","number":405,"state":"open","locked":false,"title":"add ConcurrentLongPairSet and test","user":{"login":"rdhabalia","id":2898254,"avatar_url":"https://avatars1.githubusercontent.com/u/2898254?v=3","gravatar_id":"","url":"https://api.github.com/users/rdhabalia","html_url":"https://github.com/rdhabalia","followers_url":"https://api.github.com/users/rdhabalia/followers","following_url":"https://api.github.com/users/rdhabalia/following{/other_user}","gists_url":"https://api.github.com/users/rdhabalia/gists{/gist_id}","starred_url":"https://api.github.com/users/rdhabalia/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/rdhabalia/subscriptions","organizations_url":"https://api.github.com/users/rdhabalia/orgs","repos_url":"https://api.github.com/users/rdhabalia/repos","events_url":"https://api.github.com/users/rdhabalia/events{/privacy}","received_events_url":"https://api.github.com/users/rdhabalia/received_events","type":"User","site_admin":false},"body":"### Motivation\r\n\r\nIntroduce `ConcurrentLongPairSet` which stores values that are composed of pairs of longs. Can be used to store pair of longs such as alternative of [set of PositionImpl](https://github.com/yahoo/pulsar/blob/master/pulsar-broker/src/main/java/com/yahoo/pulsar/broker/service/persistent/PersistentDispatcherMultipleConsumers.java#L93)\r\n\r\n### Modifications\r\n\r\nadded implementation of `ConcurrentLongPairSet` and tests.\r\n\r\n","created_at":"2017-05-14T07:25:53Z","updated_at":"2017-05-15T19:37:33Z","closed_at":null,"merged_at":null,"merge_commit_sha":"4fffbb50a33114c8deb915e8eba1b29f68864f26","assignee":{"login":"rdhabalia","id":2898254,"avatar_url":"https://avatars1.githubusercontent.com/u/2898254?v=3","gravatar_id":"","url":"https://api.github.com/users/rdhabalia","html_url":"https://github.com/rdhabalia","followers_url":"https://api.github.com/users/rdhabalia/followers","following_url":"https://api.github.com/users/rdhabalia/following{/other_user}","gists_url":"https://api.github.com/users/rdhabalia/gists{/gist_id}","starred_url":"https://api.github.com/users/rdhabalia/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/rdhabalia/subscriptions","organizations_url":"https://api.github.com/users/rdhabalia/orgs","repos_url":"https://api.github.com/users/rdhabalia/repos","events_url":"https://api.github.com/users/rdhabalia/events{/privacy}","received_events_url":"https://api.github.com/users/rdhabalia/received_events","type":"User","site_admin":false},"assignees":[{"login":"rdhabalia","id":2898254,"avatar_url":"https://avatars1.githubusercontent.com/u/2898254?v=3","gravatar_id":"","url":"https://api.github.com/users/rdhabalia","html_url":"https://github.com/rdhabalia","followers_url":"https://api.github.com/users/rdhabalia/followers","following_url":"https://api.github.com/users/rdhabalia/following{/other_user}","gists_url":"https://api.github.com/users/rdhabalia/gists{/gist_id}","starred_url":"https://api.github.com/users/rdhabalia/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/rdhabalia/subscriptions","organizations_url":"https://api.github.com/users/rdhabalia/orgs","repos_url":"https://api.github.com/users/rdhabalia/repos","events_url":"https://api.github.com/users/rdhabalia/events{/privacy}","received_events_url":"https://api.github.com/users/rdhabalia/received_events","type":"User","site_admin":false}],"requested_reviewers":[],"milestone":{"url":"https://api.github.com/repos/yahoo/pulsar/milestones/7","html_url":"https://github.com/yahoo/pulsar/milestone/7","labels_url":"https://api.github.com/repos/yahoo/pulsar/milestones/7/labels","id":2296868,"number":7,"title":"1.18","description":"","creator":{"login":"merlimat","id":62500,"avatar_url":"https://avatars1.githubusercontent.com/u/62500?v=3","gravatar_id":"","url":"https://api.github.com/users/merlimat","html_url":"https://github.com/merlimat","followers_url":"https://api.github.com/users/merlimat/followers","following_url":"https://api.github.com/users/merlimat/following{/other_user}","gists_url":"https://api.github.com/users/merlimat/gists{/gist_id}","starred_url":"https://api.github.com/users/merlimat/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/merlimat/subscriptions","organizations_url":"https://api.github.com/users/merlimat/orgs","repos_url":"https://api.github.com/users/merlimat/repos","events_url":"https://api.github.com/users/merlimat/events{/privacy}","received_events_url":"https://api.github.com/users/merlimat/received_events","type":"User","site_admin":false},"open_issues":19,"closed_issues":62,"state":"open","created_at":"2017-02-03T05:50:42Z","updated_at":"2017-05-15T19:08:38Z","due_on":null,"closed_at":null},"commits_url":"https://api.github.com/repos/yahoo/pulsar/pulls/405/commits","review_comments_url":"https://api.github.com/repos/yahoo/pulsar/pulls/405/comments","review_comment_url":"https://api.github.com/repos/yahoo/pulsar/pulls/comments{/number}","comments_url":"https://api.github.com/repos/yahoo/pulsar/issues/405/comments","statuses_url":"https://api.github.com/repos/yahoo/pulsar/statuses/6bb403eaa7633d31d4f63bdfda99630e54033452","head":{"label":"rdhabalia:set","ref":"set","sha":"6bb403eaa7633d31d4f63bdfda99630e54033452","user":{"login":"rdhabalia","id":2898254,"avatar_url":"https://avatars1.githubusercontent.com/u/2898254?v=3","gravatar_id":"","url":"https://api.github.com/users/rdhabalia","html_url":"https://github.com/rdhabalia","followers_url":"https://api.github.com/users/rdhabalia/followers","following_url":"https://api.github.com/users/rdhabalia/following{/other_user}","gists_url":"https://api.github.com/users/rdhabalia/gists{/gist_id}","starred_url":"https://api.github.com/users/rdhabalia/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/rdhabalia/subscriptions","organizations_url":"https://api.github.com/users/rdhabalia/orgs","repos_url":"https://api.github.com/users/rdhabalia/repos","events_url":"https://api.github.com/users/rdhabalia/events{/privacy}","received_events_url":"https://api.github.com/users/rdhabalia/received_events","type":"User","site_admin":false},"repo":{"id":67649596,"name":"pulsar","full_name":"rdhabalia/pulsar","owner":{"login":"rdhabalia","id":2898254,"avatar_url":"https://avatars1.githubusercontent.com/u/2898254?v=3","gravatar_id":"","url":"https://api.github.com/users/rdhabalia","html_url":"https://github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