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ZOOKEEPER-4466: Support different watch modes on same path
Currently, in server side, there is only one watcher mode per path. This will destroy and corrupt old watch when client watch a watching path.
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106 changes: 106 additions & 0 deletions
106
zookeeper-server/src/main/java/org/apache/zookeeper/server/watch/WatchStats.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,106 @@ | ||
| /** | ||
| * 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 | ||
| * <p> | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * <p> | ||
| * 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. | ||
| */ | ||
|
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| package org.apache.zookeeper.server.watch; | ||
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| /** | ||
| * Statistics for multiple different watches on one node. | ||
| */ | ||
| public final class WatchStats { | ||
| /** | ||
| * Stats that have no watchers attached. | ||
| * | ||
| * <p>This could be used as start point to compute new stats using {@link #addMode(WatcherMode)}. | ||
| */ | ||
| public static final WatchStats NONE; | ||
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| private static final WatchStats[] WATCH_STATS; | ||
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| static { | ||
| WatchStats[] stats = new WatchStats[8]; | ||
| for (int i = 0; i < stats.length; i++) { | ||
| stats[i] = new WatchStats(i); | ||
| } | ||
| NONE = stats[0]; | ||
| WATCH_STATS = stats; | ||
| } | ||
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| private final int flags; | ||
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| private WatchStats(int flags) { | ||
| this.flags = flags; | ||
| } | ||
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| private static int mode2flag(WatcherMode mode) { | ||
| switch (mode) { | ||
| case STANDARD: return 1; | ||
| case PERSISTENT: return 2; | ||
| case PERSISTENT_RECURSIVE: return 4; | ||
| default: | ||
| throw new IllegalArgumentException("unknown watcher mode " + mode.name()); | ||
| } | ||
| } | ||
|
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| /** | ||
| * Compute a stats for given mode. | ||
| * | ||
| * @param mode watcher mode | ||
| * @return stats that represent only given mode attached | ||
| */ | ||
| public static WatchStats fromMode(WatcherMode mode) { | ||
| int flags = mode2flag(mode); | ||
| return WATCH_STATS[flags]; | ||
| } | ||
|
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| /** | ||
| * Compute stats after given mode attached to node. | ||
| * | ||
| * @param mode watcher mode | ||
| * @return a new stats if given mode is not attached to this node before, otherwise old stats | ||
| */ | ||
| public WatchStats addMode(WatcherMode mode) { | ||
| int flags = this.flags | mode2flag(mode); | ||
| return WATCH_STATS[flags]; | ||
| } | ||
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| /** | ||
| * Compute stats after given mode removed from node. | ||
| * | ||
| * @param mode watcher mode | ||
| * @return null if given mode is the last attached mode, otherwise a new stats | ||
| */ | ||
| public WatchStats removeMode(WatcherMode mode) { | ||
| int negative_mask = ~mode2flag(mode); | ||
| int flags = this.flags & negative_mask; | ||
| if (flags == 0) { | ||
| return null; | ||
| } | ||
| return WATCH_STATS[flags]; | ||
| } | ||
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| /** | ||
| * Check whether given mode is attached to this node. | ||
| * | ||
| * @param mode watcher mode | ||
| * @return true if given mode is attached to this node. | ||
| */ | ||
| public boolean hasMode(WatcherMode mode) { | ||
| int flags = mode2flag(mode); | ||
| return (this.flags & flags) != 0; | ||
| } | ||
| } |
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