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From GitBox <...@apache.org>
Subject [GitHub] [hadoop] arp7 commented on a change in pull request #1564: HDDS-2223. Support ReadWrite lock in LockManager.
Date Thu, 03 Oct 2019 20:21:15 GMT
arp7 commented on a change in pull request #1564: HDDS-2223. Support ReadWrite lock in LockManager.
URL: https://github.com/apache/hadoop/pull/1564#discussion_r331234086
 
 

 ##########
 File path: hadoop-hdds/common/src/main/java/org/apache/hadoop/ozone/lock/LockManager.java
 ##########
 @@ -25,42 +25,146 @@
 
 import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
+import java.util.function.Consumer;
 
 /**
  * Manages the locks on a given resource. A new lock is created for each
  * and every unique resource. Uniqueness of resource depends on the
  * {@code equals} implementation of it.
  */
-public class LockManager<T> {
+public class LockManager<R> {
 
   private static final Logger LOG = LoggerFactory.getLogger(LockManager.class);
 
-  private final Map<T, ActiveLock> activeLocks = new ConcurrentHashMap<>();
+  private final Map<R, ActiveLock> activeLocks = new ConcurrentHashMap<>();
   private final GenericObjectPool<ActiveLock> lockPool =
       new GenericObjectPool<>(new PooledLockFactory());
 
   /**
-   * Creates new LockManager instance.
+   * Creates new LockManager instance with the given Configuration.
    *
    * @param conf Configuration object
    */
-  public LockManager(Configuration conf) {
-    int maxPoolSize = conf.getInt(HddsConfigKeys.HDDS_LOCK_MAX_CONCURRENCY,
+  public LockManager(final Configuration conf) {
+    final int maxPoolSize = conf.getInt(HddsConfigKeys.HDDS_LOCK_MAX_CONCURRENCY,
         HddsConfigKeys.HDDS_LOCK_MAX_CONCURRENCY_DEFAULT);
     lockPool.setMaxTotal(maxPoolSize);
   }
 
-
   /**
    * Acquires the lock on given resource.
    *
    * <p>If the lock is not available then the current thread becomes
    * disabled for thread scheduling purposes and lies dormant until the
    * lock has been acquired.
+   *
+   * @param resource on which the lock has to be acquired
+   * @deprecated Use {@link LockManager#writeLock} instead
+   */
+  public void lock(final R resource) {
 
 Review comment:
   I think you need the `@deprecated` annotation on the function also - outside the javadoc
comment.

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