public static ParTask<String> search(String[] queries) {
List<Task<String>> queryTasks = new ArrayList<>();
for (String query : queries) {
queryTasks.add(firstImageUrl(query));
}
ParTask<String> par = Tasks.par(queryTasks);
ENGINE.run(par);
return par;
}
@Override
protected void doRunExample(final Engine engine) throws Exception {
final int[] toSort = createRandomArray(10, new Random());
final Task<int[]> mergeSort = mergeSort(toSort, new Range(0, toSort.length));
engine.run(mergeSort);
mergeSort.await();
System.out.println("Before sort: " + Arrays.toString(toSort));
System.out.println("After sort: " + Arrays.toString(mergeSort.get()));
Arrays.sort(toSort);
System.out.println("Java sort: " + Arrays.toString(toSort));
ExampleUtil.printTracingResults(mergeSort);
}
public static void main(String[] args) throws InterruptedException {
// Test sequential model: Task.par().andThen()
Task<String> cageImg = firstImageUrl("nicholas cage");
Task<String> yazhouImg = firstImageUrl("yazhou cao");
Task<String> asiaImg = firstImageUrl("asia cao");
final String host = "www.google.com";
Tuple3Task<String, String, String> fanInTask =
Task.par(cageImg, yazhouImg, asiaImg)
.andThen((a, b, c) -> System.out.println(host + a + "\n" + host + b + "\n" + host + c));
ENGINE.run(fanInTask);
// Blocking until promise resolved
fanInTask.await();
// Test search()
String[] queries = {"tom hardy", "steve jobs", "super mario"};
ParTask<String> imageList = search(queries);
imageList.await();
System.out.println("Search results:\n" + imageList.getSuccessful());
}
@SuppressWarnings("deprecation")
private void doInvoke(
final ResourceMethodDescriptor descriptor,
final RequestExecutionCallback<Object> callback,
final RequestExecutionReportBuilder requestExecutionReportBuilder,
final Object resource,
final Object... arguments)
throws IllegalAccessException {
Method method = descriptor.getMethod();
try {
switch (descriptor.getInterfaceType()) {
case CALLBACK:
int callbackIndex = descriptor.indexOfParameterType(ParamType.CALLBACK);
final RequestExecutionReport executionReport =
getRequestExecutionReport(requestExecutionReportBuilder);
// Delegate the callback call to the request execution callback along with the
// request execution report.
arguments[callbackIndex] =
new Callback<Object>() {
@Override
public void onError(Throwable e) {
callback.onError(
e instanceof RestLiServiceException
? e
: new RestLiServiceException(HttpStatus.S_500_INTERNAL_SERVER_ERROR, e),
executionReport);
}
@Override
public void onSuccess(Object result) {
callback.onSuccess(result, executionReport);
}
};
method.invoke(resource, arguments);
// App code should use the callback
break;
case SYNC:
Object applicationResult = method.invoke(resource, arguments);
callback.onSuccess(
applicationResult, getRequestExecutionReport(requestExecutionReportBuilder));
break;
case PROMISE:
if (!checkEngine(callback, descriptor, requestExecutionReportBuilder)) {
break;
}
int contextIndex = descriptor.indexOfParameterType(ParamType.PARSEQ_CONTEXT_PARAM);
if (contextIndex == -1) {
contextIndex = descriptor.indexOfParameterType(ParamType.PARSEQ_CONTEXT);
}
// run through the engine to get the context
Task<Object> restliTask = new RestLiParSeqTask(arguments, contextIndex, method, resource);
// propagate the result to the callback
restliTask.addListener(
new CallbackPromiseAdapter<Object>(
callback, restliTask, requestExecutionReportBuilder));
_engine.run(restliTask);
break;
case TASK:
if (!checkEngine(callback, descriptor, requestExecutionReportBuilder)) {
break;
}
// addListener requires Task<Object> in this case
@SuppressWarnings("unchecked")
Task<Object> task = (Task<Object>) method.invoke(resource, arguments);
if (task == null) {
callback.onError(
new RestLiServiceException(
HttpStatus.S_500_INTERNAL_SERVER_ERROR, "Error in application code: null Task"),
getRequestExecutionReport(requestExecutionReportBuilder));
} else {
task.addListener(
new CallbackPromiseAdapter<Object>(callback, task, requestExecutionReportBuilder));
_engine.run(task);
}
break;
default:
throw new AssertionError("Unexpected interface type " + descriptor.getInterfaceType());
}
} catch (InvocationTargetException e) {
// Method runtime exceptions ar expected to fail with a top level
// InvocationTargetException wrapped around the root cause.
if (RestLiServiceException.class.isAssignableFrom(e.getCause().getClass())) {
RestLiServiceException restLiServiceException = (RestLiServiceException) e.getCause();
callback.onError(
restLiServiceException, getRequestExecutionReport(requestExecutionReportBuilder));
} else {
callback.onError(
new RestLiServiceException(
HttpStatus.S_500_INTERNAL_SERVER_ERROR,
_errorResponseBuilder.getInternalErrorMessage(),
e.getCause()),
getRequestExecutionReport(requestExecutionReportBuilder));
}
}
}