reactor.core.Scannable#from

Source File: FluxMetrics.java From reactor-core with Apache License 2.0

6 votes

/**
 * Extract the name from the upstream, and detect if there was an actual name (ie. distinct from {@link
 * Scannable#stepName()}) set by the user.
 *
 * @param source the upstream
 *
 * @return a name
 */
static String resolveName(Publisher<?> source) {
	Scannable scannable = Scannable.from(source);
	if (scannable.isScanAvailable()) {
		String nameOrDefault = scannable.name();
		if (scannable.stepName()
		             .equals(nameOrDefault)) {
			return REACTOR_DEFAULT_NAME;
		}
		else {
			return nameOrDefault;
		}
	}
	else {
		log.warn("Attempting to activate metrics but the upstream is not Scannable. " + "You might want to use `name()` (and optionally `tags()`) right before `metrics()`");
		return REACTOR_DEFAULT_NAME;
	}

}

Source File: FluxPublishOnTest.java From reactor-core with Apache License 2.0

6 votes

@Test
public void scanRunOn() {
	Scannable publishOnScannable = Scannable.from(
			Flux.just(1).hide()
			    .publishOn(Schedulers.boundedElastic())
	);
	Scannable runOnScannable = publishOnScannable.scan(Scannable.Attr.RUN_ON);

	assertThat(runOnScannable).isNotNull()
	                          .matches(Scannable::isScanAvailable, "isScanAvailable");

	System.out.println(runOnScannable + " isScannable " + runOnScannable.isScanAvailable());
	System.out.println(runOnScannable.scan(Scannable.Attr.NAME));
	runOnScannable.parents().forEach(System.out::println);
	System.out.println(runOnScannable.scan(Scannable.Attr.BUFFERED));
}

Source File: SourceProducer.java From reactor-core with Apache License 2.0

5 votes

@Override
@Nullable
default Object scanUnsafe(Attr key) {
	if (key == Attr.PARENT) return Scannable.from(null);
	if (key == Attr.ACTUAL) return Scannable.from(null);

	return null;
}

Source File: FluxMetrics.java From reactor-core with Apache License 2.0

5 votes

/**
 * Extract the tags from the upstream
 *
 * @param source the upstream
 *
 * @return a {@link Tags} of {@link Tag}
 */
static Tags resolveTags(Publisher<?> source, Tags tags, String sequenceName) {
	Scannable scannable = Scannable.from(source);
	tags = tags.and(Tag.of(FluxMetrics.TAG_SEQUENCE_NAME, sequenceName));

	if (scannable.isScanAvailable()) {
		return scannable.tags()
		                //Note the combiner below is for parallel streams, which won't be used
		                //For the identity, `commonTags` should be ok (even if reduce uses it multiple times)
		                //since it deduplicates
		                .reduce(tags, TAG_ACCUMULATOR, TAG_COMBINER);
	}

	return tags;
}

Source File: FluxTimeout.java From reactor-core with Apache License 2.0

5 votes

@Nullable
static String addNameToTimeoutDescription(Publisher<?> source,
		@Nullable  String timeoutDescription) {
	if (timeoutDescription == null) {
		return null;
	}

	Scannable s = Scannable.from(source);
	if (s.isScanAvailable()) {
		return timeoutDescription + " in '" + s.name() + "'";
	}
	else {
		return timeoutDescription;
	}
}

Source File: SingleWorkerScheduler.java From reactor-core with Apache License 2.0

5 votes

@Override
public String toString() {
    Scannable mainScannable = Scannable.from(main);
    if (mainScannable.isScanAvailable()) {
        return Schedulers.SINGLE + "Worker(" + mainScannable.scanUnsafe(Attr.NAME) + ")";
    }
    return Schedulers.SINGLE + "Worker(" + main.toString() + ")";
}

Source File: BaseOperatorTest.java From reactor-core with Apache License 2.0

5 votes

final void touchInner(@Nullable Object t){
	if(t == null) return;
	Scannable o = Scannable.from(t);
	o.scan(Attr.ACTUAL);
	o.scan(Attr.BUFFERED);
	o.scan(Attr.CANCELLED);
	o.scan(Attr.CAPACITY);
	o.scan(Attr.DELAY_ERROR);
	o.scan(Attr.ERROR);
	o.scan(Attr.PREFETCH);
	o.scan(Attr.PARENT);
	o.scan(Attr.REQUESTED_FROM_DOWNSTREAM);
	o.scan(Attr.TERMINATED);
	o.inners();
}