/**
* convenience for setting "blocking details" on any task where the current thread is running,
* while the passed code is executed; often used from groovy as <code>
* withBlockingDetails("sleeping 5s") { Thread.sleep(5000); } </code>
*
* @deprecated in 0.4.0, use Tasks.withBlockingDetails
*/
public static Object withBlockingDetails(String description, Callable code) throws Exception {
return Tasks.withBlockingDetails(description, code);
}
/**
* attempt to resolve the given value as the given type, waiting on futures, submitting if
* necessary, and coercing as allowed by TypeCoercions; contextMessage (optional) will be
* displayed in status reports while it waits (e.g. the name of the config key being looked up)
*/
@SuppressWarnings({"unchecked", "rawtypes"})
public static <T> T resolveValue(
Object v, Class<T> type, ExecutionContext exec, String contextMessage)
throws ExecutionException, InterruptedException {
// if the expected type is a closure or map and that's what we have, we're done (or if it's
// null);
// but not allowed to return a future or DeferredSupplier as the resolved value
if (v == null
|| (type.isInstance(v)
&& !Future.class.isInstance(v)
&& !DeferredSupplier.class.isInstance(v))) return (T) v;
try {
// if it's a task or a future, we wait for the task to complete
if (v instanceof Task) {
// if it's a task, we make sure it is submitted
// (perhaps could run it here? ... tbd)
if (!((Task) v).isSubmitted()) {
exec.submit((Task) v);
}
}
if (v instanceof Future) {
final Future<?> vfuture = (Future<?>) v;
// including tasks, above
if (!vfuture.isDone()) {
final AtomicReference<Object> vref = new AtomicReference<Object>(v);
withBlockingDetails(
"Waiting for " + (contextMessage != null ? contextMessage + ", " : "") + v,
new Callable<Void>() {
public Void call() throws Exception {
vref.set(vfuture.get());
return null;
}
});
v = vref.get();
} else {
v = vfuture.get();
}
} else if (v instanceof DeferredSupplier<?>) {
v = ((DeferredSupplier<?>) v).get();
} else if (v instanceof Map) {
// and if a map or list we look inside
Map result = Maps.newLinkedHashMap();
for (Map.Entry<?, ?> entry : ((Map<?, ?>) v).entrySet()) {
result.put(
entry.getKey(),
resolveValue(
entry.getValue(),
type,
exec,
(contextMessage != null ? contextMessage + ", " : "")
+ "map entry "
+ entry.getKey()));
}
return (T) result;
} else if (v instanceof List) {
List result = Lists.newArrayList();
int count = 0;
for (Object it : (List) v) {
result.add(
resolveValue(
it,
type,
exec,
(contextMessage != null ? contextMessage + ", " : "") + "list entry " + count));
count++;
}
return (T) result;
} else {
return TypeCoercions.coerce(v, type);
}
} catch (Exception e) {
throw new IllegalArgumentException(
"Error resolving "
+ (contextMessage != null ? contextMessage + ", " : "")
+ v
+ ", in "
+ exec
+ ": "
+ e,
e);
}
return resolveValue(v, type, exec, contextMessage);
}
