CompositeLogger implements Logger<M, E, F> { @Override public void beforeUpdate(M model, E event) { for (Logger<M, E, F> logger : loggers) { logger.beforeUpdate(model, event); } } private  CompositeLogger(List<Logger<M, E, F>> loggers); @SafeVarargs static Logger<M, E, F> from(Logger<M, E, F> logger, Logger<M, E, F>... loggers); @Override void beforeInit(M model); @Override void afterInit(M model, First<M, F> result); @Override void exceptionDuringInit(M model, Throwable exception); @Override void beforeUpdate(M model, E event); @Override void afterUpdate(M model, E event, Next<M, F> result); @Override void exceptionDuringUpdate(M model, E event, Throwable exception);  }
@Test public void delegatesBeforeUpdateToAllLoggers() { BeforeUpdate<String, Integer> testCase = BeforeUpdate.create("Hello", 5); underTest.beforeUpdate(testCase.model(), testCase.event()); assertTestCaseLogged(testCase); }