Method enterIf

output/java_guava/1.4.17/Monitor.java:630–644

Enters this monitor if the guard is satisfied. Blocks indefinitely acquiring the lock, but does not wait for the guard to be satisfied. @return whether the monitor was entered, which guarantees that the guard is now satisfied

(Guard guard)

  public boolean enterIf(Guard guard) {
    if (guard.monitor != this) {
      throw new IllegalMonitorStateException();
    }
    final ReentrantLock lock = this.lock;
    lock.lock();
    boolean satisfied = false;
    try {
      return satisfied = guard.isSatisfied();
    } finally {
      if (!satisfied) {
        lock.unlock();
      }
    }
  }

  /**
   * Enters this monitor if the guard is satisfied. Blocks indefinitely acquiring the lock, but does