Examples with ComponentStateListener org.apache.felix.dm.ComponentStateListener used on opensource projects

Example 6 with ComponentStateListener

use of org.apache.felix.dm.ComponentStateListener in project felix by apache.

the class ComponentTest method createComponentStartItAddDependencyAndListenerMakeDependencyAvailableAndUnavailableImmediately.

@Test
public void createComponentStartItAddDependencyAndListenerMakeDependencyAvailableAndUnavailableImmediately() {
    ComponentImpl c = new ComponentImpl();
    c.setImplementation(MyComponent.class);
    final SimpleServiceDependency d = new SimpleServiceDependency();
    d.setRequired(true);
    ComponentStateListener l = new ComponentStateListener() {

        @Override
        public void changed(Component c, ComponentState state) {
            // make the dependency unavailable
            d.remove(new EventImpl());
        }
    };
    c.start();
    c.add(d);
    // we add a listener here which immediately triggers an 'external event' that
    // makes the dependency unavailable again as soon as it's invoked
    c.add(l);
    Assert.assertEquals("Component unavailable, dependency unavailable", false, c.isAvailable());
    // so even though we make the dependency available here, before our call returns it
    // is made unavailable again
    d.add(new EventImpl());
    Assert.assertEquals("Component *still* unavailable, because the listener immediately makes the dependency unavailable", false, c.isAvailable());
    c.remove(l);
    Assert.assertEquals("listener removed, component still unavailable", false, c.isAvailable());
    c.remove(d);
    Assert.assertEquals("dependency removed, component available", true, c.isAvailable());
    c.stop();
    Assert.assertEquals("Component stopped, should be unavailable", false, c.isAvailable());
}