Method cas

future-java/src/main/java/io/trane/future/Promise.java:199–201

(final Object oldState, final Object newState)

  }

  private final boolean cas(final Object oldState, final Object newState) {
    return Unsafe.compareAndSwapObject(this, STATE_OFFSET, oldState, newState);
  }

  /**
   * Becomes another future. This and result become the same: both are completed