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/*
* Copyright 2002-2024 the original author or 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
*
* https://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 org.springframework.core;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Map;
import kotlin.Unit;
import kotlin.coroutines.CoroutineContext;
import kotlin.jvm.JvmClassMappingKt;
import kotlin.reflect.KClass;
import kotlin.reflect.KFunction;
import kotlin.reflect.KParameter;
import kotlin.reflect.KType;
import kotlin.reflect.full.KCallables;
import kotlin.reflect.full.KClasses;
import kotlin.reflect.full.KClassifiers;
import kotlin.reflect.full.KTypes;
import kotlin.reflect.jvm.KCallablesJvm;
import kotlin.reflect.jvm.ReflectJvmMapping;
import kotlinx.coroutines.BuildersKt;
import kotlinx.coroutines.CoroutineStart;
import kotlinx.coroutines.Deferred;
import kotlinx.coroutines.Dispatchers;
import kotlinx.coroutines.GlobalScope;
import kotlinx.coroutines.flow.Flow;
import kotlinx.coroutines.reactor.MonoKt;
import kotlinx.coroutines.reactor.ReactorFlowKt;
import org.reactivestreams.Publisher;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
import org.springframework.util.CollectionUtils;
/**
* Utilities for working with Kotlin Coroutines.
*
* @author Sebastien Deleuze
* @author Phillip Webb
* @since 5.2
*/
public abstract class CoroutinesUtils {
private static final KType flowType = KClassifiers.getStarProjectedType(JvmClassMappingKt.getKotlinClass(Flow.class));
private static final KType monoType = KClassifiers.getStarProjectedType(JvmClassMappingKt.getKotlinClass(Mono.class));
private static final KType publisherType = KClassifiers.getStarProjectedType(JvmClassMappingKt.getKotlinClass(Publisher.class));
/**
* Convert a {@link Deferred} instance to a {@link Mono}.
*/
public static Mono deferredToMono(Deferred source) {
return MonoKt.mono(Dispatchers.getUnconfined(),
(scope, continuation) -> source.await(continuation));
}
/**
* Convert a {@link Mono} instance to a {@link Deferred}.
*/
public static Deferred monoToDeferred(Mono source) {
return BuildersKt.async(GlobalScope.INSTANCE, Dispatchers.getUnconfined(),
CoroutineStart.DEFAULT,
(scope, continuation) -> MonoKt.awaitSingleOrNull(source, continuation));
}
/**
* Invoke a suspending function and convert it to {@link Mono} or {@link Flux}.
* Uses an {@linkplain Dispatchers#getUnconfined() unconfined} dispatcher.
* @param method the suspending function to invoke
* @param target the target to invoke {@code method} on
* @param args the function arguments. If the {@code Continuation} argument is specified as the last argument
* (typically {@code null}), it is ignored.
* @return the method invocation result as reactive stream
* @throws IllegalArgumentException if {@code method} is not a suspending function
*/
public static Publisher invokeSuspendingFunction(Method method, Object target, @Nullable Object... args) {
return invokeSuspendingFunction(Dispatchers.getUnconfined(), method, target, args);
}
/**
* Invoke a suspending function and convert it to {@link Mono} or
* {@link Flux}.
* @param context the coroutine context to use
* @param method the suspending function to invoke
* @param target the target to invoke {@code method} on
* @param args the function arguments. If the {@code Continuation} argument is specified as the last argument
* (typically {@code null}), it is ignored.
* @return the method invocation result as reactive stream
* @throws IllegalArgumentException if {@code method} is not a suspending function
* @since 6.0
*/
@SuppressWarnings({"deprecation", "DataFlowIssue"})
public static Publisher invokeSuspendingFunction(
CoroutineContext context, Method method, @Nullable Object target, @Nullable Object... args) {
Assert.isTrue(KotlinDetector.isSuspendingFunction(method), "Method must be a suspending function");
KFunction function = ReflectJvmMapping.getKotlinFunction(method);
Assert.notNull(function, () -> "Failed to get Kotlin function for method: " + method);
if (method.isAccessible() && !KCallablesJvm.isAccessible(function)) {
KCallablesJvm.setAccessible(function, true);
}
Mono
