io.micronaut.reactive.rxjava2.RxInstrumentedParallelFlowable Maven / Gradle / Ivy

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/*
 * Copyright 2017-2019 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.ReactiveInstrumenter;
import io.micronaut.scheduling.instrument.RunnableInstrumenter;
import io.reactivex.parallel.ParallelFlowable;
import org.reactivestreams.Subscriber;

import java.util.Collection;
import java.util.List;

/**
 * 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 List instrumentations;

    /**
     * Default constructor.
     * @param source The source
     * @param instrumentations The instrumentations
     */
    RxInstrumentedParallelFlowable(
            ParallelFlowable source, List instrumentations) {
        this.source = source;
        this.instrumentations = instrumentations;
    }

    /**
     * Default constructor.
     * @param source The source
     * @param instrumentations The instrumentations
     */
    RxInstrumentedParallelFlowable(
            ParallelFlowable source, Collection instrumentations) {
        this.source = source;
        this.instrumentations = toRunnableInstrumenters(instrumentations);
    }

    @Override public int parallelism() {
        return source.parallelism();
    }

    @Override public void subscribe(Subscriber[] s) {
        if (!validate(s)) {
            return;
        }
        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, instrumentations);
        }
        source.subscribe(parents);
    }
}