io.micronaut.reactive.rxjava2.RxJava2Instrumentation Maven / Gradle / Ivy
/*
* Copyright 2017-2018 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.context.annotation.Context;
import io.micronaut.context.annotation.Requires;
import io.micronaut.core.annotation.Internal;
import io.micronaut.scheduling.instrument.RunnableInstrumenter;
import io.reactivex.Flowable;
import io.reactivex.functions.Function;
import io.reactivex.plugins.RxJavaPlugins;
import javax.annotation.PostConstruct;
import javax.inject.Singleton;
/**
* Provides a single point of entry for all instrumentations for RxJava 2.x.
*
* @author Graeme Rocher
* @since 1.0
*/
@Singleton
@Context
@Requires(classes = Flowable.class)
@Internal
class RxJava2Instrumentation implements Function {
private final RunnableInstrumenter[] instrumenters;
/**
* Creates a new instance.
*
* @param instrumenters The instrumenters for the {@link Runnable} interface
*/
public RxJava2Instrumentation(RunnableInstrumenter... instrumenters) {
this.instrumenters = instrumenters;
}
/**
* Initialize RxJava2 instrumentation.
*/
@PostConstruct
void init() {
Function existing = RxJavaPlugins.getScheduleHandler();
if (existing != null && !(existing instanceof RxJava2Instrumentation)) {
RxJavaPlugins.setScheduleHandler(runnable -> this.apply(existing.apply(runnable)));
} else {
RxJavaPlugins.setScheduleHandler(this);
}
}
@Override
public Runnable apply(Runnable runnable) throws Exception {
Runnable newRunnable = runnable;
for (RunnableInstrumenter instrumenter : instrumenters) {
newRunnable = instrumenter.instrument(newRunnable);
}
return newRunnable;
}
}