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/*
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** Module : RedisLockManager.java
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** Abstract : Implementation of LockManager for Redis backend.
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**
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** Copyright (c) 2005-2026, Golden Code Development Corporation.
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**
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** -#- -I- --Date-- ----------------------------------Description----------------------------------
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** 001 ES 20260516 Created initial version.
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*/
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/*
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** This program is free software: you can redistribute it and/or modify
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** it under the terms of the GNU Affero General Public License as
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** published by the Free Software Foundation, either version 3 of the
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** License, or (at your option) any later version.
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**
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** This program is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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** GNU Affero General Public License for more details.
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**
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** You may find a copy of the GNU Affero GPL version 3 at the following
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** location: https://www.gnu.org/licenses/agpl-3.0.en.html
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**
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** Additional terms under GNU Affero GPL version 3 section 7:
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**
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** Under Section 7 of the GNU Affero GPL version 3, the following additional
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** terms apply to the works covered under the License. These additional terms
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** are non-permissive additional terms allowed under Section 7 of the GNU
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** Affero GPL version 3 and may not be removed by you.
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**
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** 0. Attribution Requirement.
|
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**
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** You must preserve all legal notices or author attributions in the covered
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** work or Appropriate Legal Notices displayed by works containing the covered
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** work. You may not remove from the covered work any author or developer
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** credit already included within the covered work.
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**
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** 1. No License To Use Trademarks.
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**
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** This license does not grant any license or rights to use the trademarks
|
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** Golden Code, FWD, any Golden Code or FWD logo, or any other trademarks
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** of Golden Code Development Corporation. You are not authorized to use the
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** name Golden Code, FWD, or the names of any author or contributor, for
|
| 45 |
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** publicity purposes without written authorization.
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**
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** 2. No Misrepresentation of Affiliation.
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**
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** You may not represent yourself as Golden Code Development Corporation or FWD.
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| 50 |
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**
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| 51 |
|
** You may not represent yourself for publicity purposes as associated with
|
| 52 |
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** Golden Code Development Corporation, FWD, or any author or contributor to
|
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** the covered work, without written authorization.
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**
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** 3. No Misrepresentation of Source or Origin.
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**
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** You may not represent the covered work as solely your work. All modified
|
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** versions of the covered work must be marked in a reasonable way to make it
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** clear that the modified work is not originating from Golden Code Development
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** Corporation or FWD. All modified versions must contain the notices of
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** attribution required in this license.
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*/
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1 |
package com.goldencode.p2j.directory;
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2 |
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3 |
import java.util.ArrayList;
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import java.util.Collections;
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5 |
import java.util.List;
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import org.redisson.api.RLock;
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import org.redisson.api.RReadWriteLock;
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import org.redisson.api.RedissonClient;
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import redis.clients.jedis.Jedis;
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import redis.clients.jedis.JedisPool;
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8 |
import com.goldencode.p2j.util.logging.CentralLogger;
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9 |
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/**
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* A Redis-backed implementation of the {@link LockManager} interface.
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* <p>
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* This manager uses Redisson to provide distributed, hierarchical locking for
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* directory tree nodes. It splits a node's path into segments and acquires
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* appropriate read/write locks ("traffic" and "batch" locks) along the path
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* to ensure cluster-wide consistency during concurrent operations.
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* </p>
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*/
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10 |
public class RedisLockManager implements LockManager
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11 |
{
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/** The Redisson client used to acquire distributed locks. */
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private RedissonClient redisson;
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/**
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* Constructs a new {@code RedisLockManager} and initializes the Redisson client
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* from the global {@link RedisConfig}.
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*/
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private static final CentralLogger LOG = CentralLogger.get(RedisLockManager.class);
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private static final String JVM_ID = java.util.UUID.randomUUID().toString();
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private static final String LOCK_PREFIX = "dir:lock:tree:";
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private static final int SPIN_SLEEP_MS = 10;
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private JedisPool jedisPool;
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private static volatile String lockSha = null;
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private static volatile String releaseSha = null;
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private volatile boolean shutdown = false;
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private static final String LUA_LOCK_SCRIPT =
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"local targetType = ARGV[1]; " +
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"local threadId = ARGV[2]; " +
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"for i, key in ipairs(KEYS) do " +
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"local lockKeys = redis.call('HKEYS', key); " +
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"for j, tId in ipairs(lockKeys) do " +
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"if tId ~= threadId then " +
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"local lType = redis.call('HGET', key, tId); " +
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33 |
"if lType == 'WX' or targetType == 'WX' then return \"0\"; end " +
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"if targetType == 'RX' then return \"0\"; end " +
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"if lType == 'RX' or lType == 'INTENT_RX' then " +
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"if targetType ~= 'RO' then return \"0\"; end " +
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37 |
"end " +
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38 |
"end " +
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39 |
"end " +
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"end " +
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"local intentType = (targetType == 'RX') and 'INTENT_RX' or 'INTENT'; " +
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"for i, key in ipairs(KEYS) do " +
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"local applyType = (i == #KEYS) and targetType or intentType; " +
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"redis.call('HSET', key, threadId, applyType); " +
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45 |
"end " +
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46 |
"return \"1\";";
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48 |
private static final String LUA_UNLOCK_SCRIPT =
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"local threadId = ARGV[1]; " +
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"for i, key in ipairs(KEYS) do " +
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"redis.call('HDEL', key, threadId); " +
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"end " +
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"return \"1\";";
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55 |
private static final String LUA_UPGRADE_SCRIPT =
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56 |
"local threadId = ARGV[1]; " +
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57 |
"local targetKey = KEYS[1]; " +
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58 |
"local currentType = redis.call('HGET', targetKey, threadId); " +
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59 |
"if currentType == 'RX' then " +
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60 |
"if redis.call('HLEN', targetKey) > 1 then return \"0\"; end " +
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61 |
"redis.call('HSET', targetKey, threadId, 'WX'); " +
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|
62 |
"return \"1\"; " +
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|
63 |
"end " +
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|
64 |
"return \"0\";";
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|
65 |
|
| 93 |
66 |
public RedisLockManager()
|
| 94 |
67 |
{
|
| 95 |
68 |
}
|
| 96 |
69 |
|
| 97 |
|
/**
|
| 98 |
|
* Acquires a distributed lock for a specific directory node and its ancestors.
|
| 99 |
|
* <p>
|
| 100 |
|
* The method iterates through the path hierarchy (e.g., from root down to the target node),
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* acquiring sequential Read/Write locks. This prevents parent nodes from being modified
|
| 102 |
|
* or deleted while child nodes are actively being accessed or modified.
|
| 103 |
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* </p>
|
| 104 |
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*
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| 105 |
|
* @param id
|
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* The normalized string path of the node to lock (e.g., "parent/child").
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* @param type
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|
* The type of lock requested (e.g., {@code LOCK_RW}, {@code LOCK_RX}, {@code LOCK_WX}).
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*
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|
* @return An opaque lock reference object ({@link LockRef}) if the locks were successfully acquired,
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* or {@code null} if the acquisition failed or inputs were invalid.
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|
*/
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| 113 |
70 |
@Override
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71 |
public Object enterLock(String id, int type)
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| 115 |
72 |
{
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| 116 |
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if (id == null || type == LOCK_WX)
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{
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return null;
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}
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73 |
if (id == null || shutdown) return null;
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74 |
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75 |
id = IdUtils.normalize(id);
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String[] pathParts = splitPath(id);
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List<RLock> acquiredLocks = new ArrayList<>();
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if (redisson == null)
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76 |
List<String> keys = buildHierarchyKeys(id);
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77 |
String threadId = JVM_ID + ":" + Thread.currentThread().getId();
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78 |
String typeStr = getTypeString(type);
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79 |
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80 |
List<String> args = new ArrayList<>();
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81 |
args.add(typeStr);
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82 |
args.add(threadId);
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83 |
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84 |
if (jedisPool == null)
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85 |
{
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86 |
RedisConfig cfg = RedisConfig.getRedisConfig();
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| 128 |
|
redisson = cfg.getRedissonClient();
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}
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try
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{
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for (int i = 0; i < pathParts.length; i++)
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{
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String path = pathParts[i];
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boolean isTarget = (i == pathParts.length - 1);
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|
RReadWriteLock trafficLock = redisson.getReadWriteLock("dir:lock:traffic:" + path);
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RReadWriteLock batchLock = redisson.getReadWriteLock("dir:lock:batch:" + path);
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| 141 |
|
if (type == LOCK_RW || type == LOCK_RX)
|
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{
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| 143 |
|
boolean needsTrafficWrite = isTarget && (type == LOCK_RX);
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|
RLock tLock = needsTrafficWrite ? trafficLock.writeLock() : trafficLock.readLock();
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| 145 |
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| 146 |
|
tLock.lockInterruptibly();
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acquiredLocks.add(tLock);
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| 148 |
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}
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|
RLock bLock = batchLock.readLock();
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| 151 |
|
bLock.lockInterruptibly();
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acquiredLocks.add(bLock);
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|
if (isTarget)
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|
{
|
| 156 |
|
return new LockRef(acquiredLocks, type, batchLock);
|
| 157 |
|
}
|
| 158 |
|
}
|
| 159 |
|
}
|
| 160 |
|
catch (InterruptedException e)
|
| 161 |
|
{
|
| 162 |
|
Thread.currentThread().interrupt();
|
| 163 |
|
releaseAll(acquiredLocks);
|
| 164 |
|
return null;
|
| 165 |
|
}
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| 166 |
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|
87 |
jedisPool = cfg.getJedisPool();
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|
88 |
}
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|
89 |
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90 |
while (!shutdown)
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|
91 |
{
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|
92 |
try (Jedis jedis = jedisPool.getResource())
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|
93 |
{
|
|
94 |
if (lockSha == null || releaseSha == null)
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|
95 |
{
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|
96 |
lockSha = jedis.scriptLoad(LUA_LOCK_SCRIPT);
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|
97 |
releaseSha = jedis.scriptLoad(LUA_UNLOCK_SCRIPT);
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|
98 |
}
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|
99 |
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|
100 |
Object res = jedis.evalsha(lockSha, keys, args);
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|
101 |
if (res != null && "1".equals(res.toString()))
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|
102 |
{
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|
103 |
return new LockRef(keys, type, threadId, this);
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|
104 |
}
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|
105 |
}
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|
106 |
catch (Exception e)
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|
107 |
{
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|
108 |
LOG.warning("Transient error acquiring lock for path: " + id, e);
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|
109 |
}
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|
110 |
|
|
111 |
try
|
|
112 |
{
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|
113 |
Thread.sleep(SPIN_SLEEP_MS);
|
|
114 |
}
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|
115 |
catch (InterruptedException e)
|
|
116 |
{
|
|
117 |
Thread.currentThread().interrupt();
|
|
118 |
return null;
|
|
119 |
}
|
|
120 |
}
|
| 167 |
121 |
return null;
|
| 168 |
122 |
}
|
| 169 |
123 |
|
| 170 |
|
/**
|
| 171 |
|
* Releases all distributed locks associated with the provided lock reference.
|
| 172 |
|
*
|
| 173 |
|
* @param objLock
|
| 174 |
|
* The lock reference object returned by {@link #enterLock(String, int)}.
|
| 175 |
|
*/
|
| 176 |
124 |
@Override
|
| 177 |
125 |
public void releaseLock(Object objLock)
|
| 178 |
126 |
{
|
| ... | ... | |
| 182 |
130 |
}
|
| 183 |
131 |
}
|
| 184 |
132 |
|
| 185 |
|
/**
|
| 186 |
|
* Attempts to upgrade an existing read lock ({@code LOCK_RX}) to an exclusive
|
| 187 |
|
* write lock ({@code LOCK_WX}).
|
| 188 |
|
*
|
| 189 |
|
* @param objLock
|
| 190 |
|
* The lock reference object to upgrade.
|
| 191 |
|
*
|
| 192 |
|
* @return {@code true} if the lock was successfully upgraded, {@code false} otherwise.
|
| 193 |
|
*/
|
| 194 |
133 |
@Override
|
| 195 |
134 |
public boolean upgradeLock(Object objLock)
|
| 196 |
135 |
{
|
| ... | ... | |
| 202 |
141 |
return ((LockRef) objLock).upgrade();
|
| 203 |
142 |
}
|
| 204 |
143 |
|
| 205 |
|
/**
|
| 206 |
|
* Gracefully shuts down the lock manager.
|
| 207 |
|
* <p>Currently, this method acts as a stub.</p>
|
| 208 |
|
*/
|
| 209 |
144 |
@Override
|
| 210 |
145 |
public synchronized void shutdownManager()
|
| 211 |
146 |
{
|
| 212 |
|
// this.shutdown = true;
|
| 213 |
|
}
|
| 214 |
|
|
| 215 |
|
/**
|
| 216 |
|
* Releases a list of acquired locks asynchronously in reverse order of their acquisition.
|
| 217 |
|
*
|
| 218 |
|
* @param locks
|
| 219 |
|
* The list of Redisson locks to release.
|
| 220 |
|
*/
|
| 221 |
|
private void releaseAll(List<RLock> locks)
|
| 222 |
|
{
|
| 223 |
|
for (int i = locks.size() - 1; i >= 0; i--)
|
|
147 |
this.shutdown = true;
|
|
148 |
if (jedisPool != null && !jedisPool.isClosed())
|
| 224 |
149 |
{
|
| 225 |
|
RLock lock = locks.get(i);
|
| 226 |
|
if (lock.isHeldByCurrentThread())
|
| 227 |
|
{
|
| 228 |
|
lock.unlockAsync();
|
| 229 |
|
}
|
|
150 |
jedisPool.close();
|
| 230 |
151 |
}
|
| 231 |
152 |
}
|
| 232 |
153 |
|
| 233 |
|
/**
|
| 234 |
|
* Splits a hierarchical path string into an array of progressive path segments.
|
| 235 |
|
* <p>For example, "a/b/c" becomes {@code ["a", "a/b", "a/b/c"]}.</p>
|
| 236 |
|
*
|
| 237 |
|
* @param id
|
| 238 |
|
* The full path string to split.
|
| 239 |
|
*
|
| 240 |
|
* @return An array of progressively built path strings.
|
| 241 |
|
*/
|
| 242 |
|
private String[] splitPath(String id)
|
|
154 |
private List<String> buildHierarchyKeys(String id)
|
| 243 |
155 |
{
|
| 244 |
|
if (id.isEmpty() || id.equals("/"))
|
|
156 |
if (id.isEmpty() || "/".equals(id))
|
| 245 |
157 |
{
|
| 246 |
|
return new String[]{""};
|
|
158 |
return Collections.singletonList(LOCK_PREFIX + "");
|
| 247 |
159 |
}
|
| 248 |
160 |
|
| 249 |
161 |
String[] segments = id.split("/");
|
| 250 |
|
String[] paths = new String[segments.length];
|
|
162 |
List<String> keys = new ArrayList<>();
|
| 251 |
163 |
StringBuilder current = new StringBuilder();
|
| 252 |
|
for (int i = 0; i < segments.length; i++)
|
|
164 |
|
|
165 |
for (String segment : segments)
|
| 253 |
166 |
{
|
| 254 |
|
if (i > 0)
|
|
167 |
if (segment.isEmpty())
|
|
168 |
{
|
|
169 |
keys.add(LOCK_PREFIX + current.toString());
|
|
170 |
continue;
|
|
171 |
}
|
|
172 |
|
|
173 |
if (current.length() > 0)
|
| 255 |
174 |
{
|
| 256 |
175 |
current.append("/");
|
| 257 |
176 |
}
|
| 258 |
177 |
|
| 259 |
|
current.append(segments[i]);
|
| 260 |
|
paths[i] = current.toString();
|
|
178 |
current.append(segment);
|
|
179 |
keys.add(LOCK_PREFIX + current.toString());
|
| 261 |
180 |
}
|
| 262 |
181 |
|
| 263 |
|
return paths;
|
| 264 |
|
}
|
| 265 |
|
|
| 266 |
|
/**
|
| 267 |
|
* An internal wrapper class that tracks the state and collection of distributed
|
| 268 |
|
* locks acquired during a lock operation.
|
| 269 |
|
*/
|
|
182 |
return keys;
|
|
183 |
}
|
|
184 |
|
|
185 |
private String getTypeString(int type)
|
|
186 |
{
|
|
187 |
switch (type)
|
|
188 |
{
|
|
189 |
case LOCK_RX: return "RX";
|
|
190 |
case LOCK_RW: return "RW";
|
|
191 |
case LOCK_WX: return "WX";
|
|
192 |
default: return "RO";
|
|
193 |
}
|
|
194 |
}
|
|
195 |
|
| 270 |
196 |
static class LockRef
|
| 271 |
197 |
{
|
| 272 |
|
/** The sequential list of locks acquired along the node hierarchy. */
|
| 273 |
|
private final List<RLock> locks;
|
| 274 |
|
|
| 275 |
|
/** The current logical lock type (e.g., LOCK_RX, LOCK_WX). */
|
|
198 |
private final List<String> keys;
|
| 276 |
199 |
private int type;
|
| 277 |
|
|
| 278 |
|
/** The specific read/write batch lock associated with the target node. */
|
| 279 |
|
private RReadWriteLock batchLock;
|
|
200 |
private final String threadId;
|
|
201 |
private final RedisLockManager manager;
|
| 280 |
202 |
|
| 281 |
|
/**
|
| 282 |
|
* Creates a new lock reference.
|
| 283 |
|
*
|
| 284 |
|
* @param locks
|
| 285 |
|
* The list of acquired locks.
|
| 286 |
|
* @param type
|
| 287 |
|
* The type of lock requested.
|
| 288 |
|
* @param batchLock
|
| 289 |
|
* The Redisson ReadWrite lock of the target node.
|
| 290 |
|
*/
|
| 291 |
|
public LockRef(List<RLock> locks, int type, RReadWriteLock batchLock)
|
|
203 |
public LockRef(List<String> keys, int type, String threadId, RedisLockManager manager)
|
| 292 |
204 |
{
|
| 293 |
|
this.locks = locks;
|
|
205 |
this.keys = keys;
|
| 294 |
206 |
this.type = type;
|
| 295 |
|
this.batchLock = batchLock;
|
|
207 |
this.threadId = threadId;
|
|
208 |
this.manager = manager;
|
| 296 |
209 |
}
|
| 297 |
210 |
|
| 298 |
|
/**
|
| 299 |
|
* Upgrades a {@code LOCK_RX} (Read Exclusive) lock to a {@code LOCK_WX} (Write Exclusive) lock.
|
| 300 |
|
* It releases the current read lock and blocks until the write lock can be acquired.
|
| 301 |
|
*
|
| 302 |
|
* @return {@code true} if upgraded successfully, {@code false} if the current lock
|
| 303 |
|
* type does not support upgrading.
|
| 304 |
|
*/
|
| 305 |
211 |
public boolean upgrade()
|
| 306 |
212 |
{
|
| 307 |
|
if (type == LOCK_RX)
|
|
213 |
if (this.type != LOCK_RX) return false;
|
|
214 |
|
|
215 |
List<String> targetKeyList = Collections.singletonList(keys.get(keys.size() - 1));
|
|
216 |
List<String> args = new ArrayList<>();
|
|
217 |
args.add(threadId);
|
|
218 |
|
|
219 |
while (!manager.shutdown)
|
| 308 |
220 |
{
|
|
221 |
try (Jedis jedis = manager.jedisPool.getResource())
|
|
222 |
{
|
|
223 |
Object res = jedis.eval(LUA_UPGRADE_SCRIPT, targetKeyList, args);
|
|
224 |
if (res != null && "1".equals(res.toString()))
|
|
225 |
{
|
|
226 |
this.type = LOCK_WX;
|
|
227 |
return true;
|
|
228 |
}
|
|
229 |
}
|
|
230 |
catch (Exception e)
|
|
231 |
{
|
|
232 |
LOG.warning("Exception during lock upgrade attempt", e);
|
|
233 |
}
|
|
234 |
|
| 309 |
235 |
try
|
| 310 |
236 |
{
|
| 311 |
|
RLock rdLock = batchLock.readLock();
|
| 312 |
|
RLock wxLock = batchLock.writeLock();
|
| 313 |
|
|
| 314 |
|
rdLock.unlock();
|
| 315 |
|
wxLock.lockInterruptibly();
|
| 316 |
|
|
| 317 |
|
locks.add(wxLock);
|
| 318 |
|
this.type = LOCK_WX;
|
| 319 |
|
return true;
|
| 320 |
|
}
|
|
237 |
Thread.sleep(SPIN_SLEEP_MS);
|
|
238 |
}
|
| 321 |
239 |
catch (InterruptedException e)
|
| 322 |
240 |
{
|
| 323 |
241 |
Thread.currentThread().interrupt();
|
|
242 |
return false;
|
| 324 |
243 |
}
|
| 325 |
244 |
}
|
| 326 |
|
|
| 327 |
245 |
return false;
|
| 328 |
246 |
}
|
| 329 |
247 |
|
| 330 |
|
/**
|
| 331 |
|
* Synchronously releases all locks tracked by this reference in reverse order
|
| 332 |
|
* of their acquisition, ensuring safe tear-down of hierarchical locks.
|
| 333 |
|
*/
|
| 334 |
248 |
public void release()
|
| 335 |
249 |
{
|
| 336 |
|
for (int i = locks.size() - 1; i >= 0; i--)
|
| 337 |
|
{
|
| 338 |
|
RLock lock = locks.get(i);
|
| 339 |
|
if (lock.isHeldByCurrentThread())
|
| 340 |
|
{
|
| 341 |
|
lock.unlock();
|
| 342 |
|
}
|
|
250 |
try (Jedis jedis = manager.jedisPool.getResource())
|
|
251 |
{
|
|
252 |
List<String> args = Collections.singletonList(threadId);
|
|
253 |
jedis.evalsha(releaseSha, keys, args);
|
|
254 |
}
|
|
255 |
catch (Exception e)
|
|
256 |
{
|
|
257 |
LOG.warning("Failed to clean up keys in Redis on release", e);
|
| 343 |
258 |
}
|
| 344 |
259 |
}
|
| 345 |
260 |
}
|