/**
* Tests the background processing if there are no child initializers.
*
* @throws org.apache.commons.lang3.concurrent.ConcurrentException so we don't have to catch it
*/
@Test
public void testInitializeNoChildren() throws ConcurrentException {
assertTrue("Wrong result of start()", initializer.start());
final MultiBackgroundInitializer.MultiBackgroundInitializerResults res = initializer.get();
assertTrue("Got child initializers", res.initializerNames().isEmpty());
assertTrue("Executor not shutdown", initializer.getActiveExecutor().isShutdown());
}
/**
* Tests the isSuccessful() method of the result object if no child initializer has thrown an
* exception.
*
* @throws org.apache.commons.lang3.concurrent.ConcurrentException so we don't have to catch it
*/
@Test
public void testInitializeResultsIsSuccessfulTrue() throws ConcurrentException {
final ChildBackgroundInitializer child = new ChildBackgroundInitializer();
initializer.addInitializer(CHILD_INIT, child);
initializer.start();
final MultiBackgroundInitializer.MultiBackgroundInitializerResults res = initializer.get();
assertTrue("Wrong success flag", res.isSuccessful());
}
/**
* Tests that the set with the names of the initializers cannot be modified.
*
* @throws org.apache.commons.lang3.concurrent.ConcurrentException so we don't have to catch it
*/
@Test(expected = UnsupportedOperationException.class)
public void testResultInitializerNamesModify() throws ConcurrentException {
checkInitialize();
final MultiBackgroundInitializer.MultiBackgroundInitializerResults res = initializer.get();
final Iterator<String> it = res.initializerNames().iterator();
it.next();
it.remove();
}
/**
* Tries to add another child initializer after the start() method has been called. This should
* not be allowed.
*
* @throws org.apache.commons.lang3.concurrent.ConcurrentException so we don't have to catch it
*/
@Test
public void testAddInitializerAfterStart() throws ConcurrentException {
initializer.start();
try {
initializer.addInitializer(CHILD_INIT, new ChildBackgroundInitializer());
fail("Could add initializer after start()!");
} catch (final IllegalStateException istex) {
initializer.get();
}
}
/**
* Tests the behavior of the initializer if one of the child initializers throws a checked
* exception.
*
* @throws org.apache.commons.lang3.concurrent.ConcurrentException so we don't have to catch it
*/
@Test
public void testInitializeEx() throws ConcurrentException {
final ChildBackgroundInitializer child = new ChildBackgroundInitializer();
child.ex = new Exception();
initializer.addInitializer(CHILD_INIT, child);
initializer.start();
final MultiBackgroundInitializer.MultiBackgroundInitializerResults res = initializer.get();
assertTrue("No exception flag", res.isException(CHILD_INIT));
assertNull("Got a results object", res.getResultObject(CHILD_INIT));
final ConcurrentException cex = res.getException(CHILD_INIT);
assertEquals("Wrong cause", child.ex, cex.getCause());
}
/**
* Tests the behavior of the initializer if one of the child initializers throws a runtime
* exception.
*/
@Test
public void testInitializeRuntimeEx() {
final ChildBackgroundInitializer child = new ChildBackgroundInitializer();
child.ex = new RuntimeException();
initializer.addInitializer(CHILD_INIT, child);
initializer.start();
try {
initializer.get();
fail("Runtime exception not thrown!");
} catch (final Exception ex) {
assertEquals("Wrong exception", child.ex, ex);
}
}
/**
* Helper method for testing the initialize() method. This method can operate with both an
* external and a temporary executor service.
*
* @return the result object produced by the initializer
* @throws org.apache.commons.lang3.concurrent.ConcurrentException so we don't have to catch it
*/
private MultiBackgroundInitializer.MultiBackgroundInitializerResults checkInitialize()
throws ConcurrentException {
final int count = 5;
for (int i = 0; i < count; i++) {
initializer.addInitializer(CHILD_INIT + i, new ChildBackgroundInitializer());
}
initializer.start();
final MultiBackgroundInitializer.MultiBackgroundInitializerResults res = initializer.get();
assertEquals("Wrong number of child initializers", count, res.initializerNames().size());
for (int i = 0; i < count; i++) {
final String key = CHILD_INIT + i;
assertTrue("Name not found: " + key, res.initializerNames().contains(key));
assertEquals("Wrong result object", Integer.valueOf(1), res.getResultObject(key));
assertFalse("Exception flag", res.isException(key));
assertNull("Got an exception", res.getException(key));
checkChild(res.getInitializer(key), initializer.getActiveExecutor());
}
return res;
}
/**
* Tests the behavior of initialize() if a child initializer has a specific executor service. Then
* this service should not be overridden.
*
* @throws org.apache.commons.lang3.concurrent.ConcurrentException so we don't have to catch it
*/
@Test
public void testInitializeChildWithExecutor() throws ConcurrentException, InterruptedException {
final String initExec = "childInitializerWithExecutor";
final ExecutorService exec = Executors.newSingleThreadExecutor();
try {
final ChildBackgroundInitializer c1 = new ChildBackgroundInitializer();
final ChildBackgroundInitializer c2 = new ChildBackgroundInitializer();
c2.setExternalExecutor(exec);
initializer.addInitializer(CHILD_INIT, c1);
initializer.addInitializer(initExec, c2);
initializer.start();
initializer.get();
checkChild(c1, initializer.getActiveExecutor());
checkChild(c2, exec);
} finally {
exec.shutdown();
exec.awaitTermination(1, TimeUnit.SECONDS);
}
}
/**
* Tests whether MultiBackgroundInitializers can be combined in a nested way.
*
* @throws org.apache.commons.lang3.concurrent.ConcurrentException so we don't have to catch it
*/
@Test
public void testInitializeNested() throws ConcurrentException {
final String nameMulti = "multiChildInitializer";
initializer.addInitializer(CHILD_INIT, new ChildBackgroundInitializer());
final MultiBackgroundInitializer mi2 = new MultiBackgroundInitializer();
final int count = 3;
for (int i = 0; i < count; i++) {
mi2.addInitializer(CHILD_INIT + i, new ChildBackgroundInitializer());
}
initializer.addInitializer(nameMulti, mi2);
initializer.start();
final MultiBackgroundInitializer.MultiBackgroundInitializerResults res = initializer.get();
final ExecutorService exec = initializer.getActiveExecutor();
checkChild(res.getInitializer(CHILD_INIT), exec);
final MultiBackgroundInitializer.MultiBackgroundInitializerResults res2 =
(MultiBackgroundInitializer.MultiBackgroundInitializerResults)
res.getResultObject(nameMulti);
assertEquals("Wrong number of initializers", count, res2.initializerNames().size());
for (int i = 0; i < count; i++) {
checkChild(res2.getInitializer(CHILD_INIT + i), exec);
}
assertTrue("Executor not shutdown", exec.isShutdown());
}