code: @Override
      public void unsetBufferManager(BufferManager bufferMgr) {
          if (TraceComponent.isAnyTracingEnabled() && tc.isEventEnabled()) {
              Tr.event(tc, "Un-setting buffer manager " + this);
          }
          //Indication that the buffer will no longer be available
          stopSource();
          this.bufferMgr = null;
      }
docs: {@inheritDoc}