Class LockImpl

solr/core/src/java/org/apache/solr/cloud/LockTree.java:46–78

  public final Map<String, Lock> allLocks = new HashMap<>();

  private class LockImpl implements Lock {
    final Node node;
    final String id;

    LockImpl(Node node) {
      this.node = node;
      this.id = UUID.randomUUID().toString();
    }

    @Override
    public void unlock() {
      synchronized (LockTree.this) {
        if (node.unlock(this)) {
          allLocks.remove(id);
        }
      }
    }

    @Override
    public String id() {
      return id;
    }

    @Override
    public boolean validateSubpath(int lockLevel, List<String> path) {
      return node.validateSubpath(lockLevel, path);
    }

    @Override
    public String toString() {
      return StrUtils.join(node.constructPath(new ArrayDeque<>()), '/');
    }
  }

  /**
   * This class is used to mark nodes for which acquiring a lock was attempted but didn't succeed.