/** Take a Throwable and return a suitable CompletableFuture that is completed exceptionally. */
private CompletableFuture<HttpResponseImpl> getExceptionalCF(Throwable t) {
if ((t instanceof CompletionException) || (t instanceof ExecutionException)) {
if (t.getCause() != null) {
t = t.getCause();
}
}
if (cancelled && t instanceof IOException) {
t = new HttpTimeoutException("request timed out");
}
return CompletableFuture.failedFuture(t);
}
public CompletableFuture<HttpResponseImpl> responseAsync(Void v) {
CompletableFuture<HttpResponseImpl> cf;
if (++attempts > max_attempts) {
cf = CompletableFuture.failedFuture(new IOException("Too many retries"));
} else {
if (currentreq.timeval() != 0) {
// set timer
td = new TimedEvent(currentreq.timeval());
client.registerTimer(td);
}
Exchange exch = getExchange();
cf =
requestFiltersAsync(currentreq)
.thenCompose(exch::responseAsync)
.thenCompose(this::responseFiltersAsync)
.thenCompose(
(Pair<HttpResponse, HttpRequestImpl> pair) -> {
HttpResponseImpl resp = (HttpResponseImpl) pair.first;
if (resp != null) {
if (attempts > 1) {
Log.logError("Succeeded on attempt: " + attempts);
}
return CompletableFuture.completedFuture(resp);
} else {
currentreq = pair.second;
Exchange previous = exch;
setExchange(new Exchange(currentreq, currentreq.getAccessControlContext()));
// reads body off previous, and then waits for next response
return previous
.responseBodyAsync(HttpResponse.ignoreBody())
.thenCompose(this::responseAsync);
}
})
.handle(
(BiFunction<HttpResponse, Throwable, Pair<HttpResponse, Throwable>>) Pair::new)
.thenCompose(
(Pair<HttpResponse, Throwable> obj) -> {
HttpResponseImpl response = (HttpResponseImpl) obj.first;
if (response != null) {
return CompletableFuture.completedFuture(response);
}
// all exceptions thrown are handled here
CompletableFuture<HttpResponseImpl> error = getExceptionalCF(obj.second);
if (error == null) {
cancelTimer();
return responseAsync(null);
} else {
return error;
}
});
}
return cf;
}