io.micronaut.reactive.rxjava2.RxInstrumentedParallelFlowable Maven / Gradle / Ivy
/*
* Copyright 2017-2020 original authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package io.micronaut.reactive.rxjava2;
import io.micronaut.core.annotation.Internal;
import io.micronaut.scheduling.instrument.InvocationInstrumenter;
import io.reactivex.parallel.ParallelFlowable;
import org.reactivestreams.Subscriber;
/**
* Inspired by code in Brave. Provides general instrumentation abstraction for RxJava2.
* See https://github.com/openzipkin/brave/tree/master/context/rxjava2/src/main/java/brave/context/rxjava2/internal.
*
* @param The type
* @author graemerocher
* @since 1.1
*/
@Internal
final class RxInstrumentedParallelFlowable extends ParallelFlowable implements RxInstrumentedComponent {
protected final ParallelFlowable source;
private final RxInstrumenterFactory instrumenterFactory;
private final InvocationInstrumenter instrumenter;
/**
* Default constructor.
*
* @param source The source
* @param instrumenterFactory The instrumenterFactory
*/
RxInstrumentedParallelFlowable(ParallelFlowable source, RxInstrumenterFactory instrumenterFactory) {
this.source = source;
this.instrumenterFactory = instrumenterFactory;
this.instrumenter = instrumenterFactory.create();
}
@Override
public int parallelism() {
return source.parallelism();
}
@Override
public void subscribe(Subscriber[] s) {
if (!validate(s)) {
return;
}
if (instrumenter != null) {
int n = s.length;
@SuppressWarnings("unchecked")
Subscriber[] parents = new Subscriber[n];
for (int i = 0; i < n; i++) {
Subscriber z = s[i];
parents[i] = RxInstrumentedWrappers.wrap(z, instrumenterFactory);
}
try {
instrumenter.beforeInvocation();
source.subscribe(parents);
} finally {
instrumenter.afterInvocation(false);
}
} else {
source.subscribe(s);
}
}
}