ZeromqProducer extends DefaultProducer { @Override public boolean isSingleton() { return true; } ZeromqProducer(ZeromqEndpoint endpoint, SocketFactory socketFactory, ContextFactory contextFactory); ContextFactory getContextFactory(); SocketFactory getSocketFactory(); @Override boolean isSingleton(); @Override void process(Exchange arg0); void setShutdownWait(int shutdownWait); @Override void start(); @Override void stop();  }
@Test public void isSingleton() { assertTrue(producer.isSingleton()); }