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KotlinInterceptedMethod.java
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KotlinInterceptedMethod.java
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/*
* 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
*
* 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 io.micronaut.aop.internal.intercepted;
import io.micronaut.aop.Interceptor;
import io.micronaut.aop.MethodInvocationContext;
import io.micronaut.aop.util.CompletableFutureContinuation;
import io.micronaut.aop.util.DelegatingContextContinuation;
import io.micronaut.core.annotation.Experimental;
import io.micronaut.core.annotation.Internal;
import io.micronaut.core.type.Argument;
import io.micronaut.core.util.KotlinUtils;
import kotlin.coroutines.Continuation;
import kotlin.coroutines.CoroutineContext;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.CompletionException;
import java.util.concurrent.CompletionStage;
import java.util.function.Consumer;
/**
* The Kotlin coroutine method intercepted as a value of {@link CompletionStage}.
*
* @author Denis Stepanov
* @since 2.1.0
*/
@Internal
@Experimental
final class KotlinInterceptedMethod implements io.micronaut.aop.kotlin.KotlinInterceptedMethod {
private final MethodInvocationContext<?, ?> context;
private Continuation continuation;
private final Consumer<Object> replaceContinuation;
private final Argument<?> returnTypeValue;
private final boolean isUnitValueType;
private KotlinInterceptedMethod(MethodInvocationContext<?, ?> context,
Continuation<?> continuation,
Consumer<Object> replaceContinuation,
Argument<?> returnTypeValue,
boolean isUnitValueType) {
this.context = context;
this.continuation = continuation;
this.returnTypeValue = returnTypeValue;
this.isUnitValueType = isUnitValueType;
this.replaceContinuation = replaceContinuation;
}
/**
* Checks if the method invocation is a Kotlin coroutine.
*
* @param context {@link MethodInvocationContext}
* @return true if Kotlin coroutine
*/
public static KotlinInterceptedMethod of(MethodInvocationContext<?, ?> context) {
if (!KotlinUtils.KOTLIN_COROUTINES_SUPPORTED || !context.getExecutableMethod().isSuspend()) {
return null;
}
Object[] parameterValues = context.getParameterValues();
if (parameterValues.length == 0) {
return null;
}
int lastParameterIndex = parameterValues.length - 1;
Object lastArgumentValue = parameterValues[lastParameterIndex];
if (lastArgumentValue instanceof Continuation) {
Continuation continuation = (Continuation) lastArgumentValue;
Consumer<Object> replaceContinuation = value -> parameterValues[lastParameterIndex] = value;
Argument<?> returnTypeValue = context.getArguments()[lastParameterIndex].getFirstTypeVariable().orElse(Argument.OBJECT_ARGUMENT);
boolean isUnitValueType = returnTypeValue.getType() == kotlin.Unit.class;
if (isUnitValueType) {
returnTypeValue = Argument.VOID_OBJECT;
}
return new KotlinInterceptedMethod(context, continuation, replaceContinuation, returnTypeValue, isUnitValueType);
}
return null;
}
@Override
public ResultType resultType() {
return ResultType.COMPLETION_STAGE;
}
@Override
public Argument<?> returnTypeValue() {
return returnTypeValue;
}
@Override
public CompletableFuture<Object> interceptResultAsCompletionStage() {
CompletableFutureContinuation completableFutureContinuation = new CompletableFutureContinuation(continuation);
replaceContinuation.accept(completableFutureContinuation);
Object result = context.proceed();
replaceContinuation.accept(continuation);
if (result != KotlinUtils.COROUTINE_SUSPENDED) {
completableFutureContinuation.resumeWith(result);
}
return completableFutureContinuation.getCompletableFuture();
}
@Override
public CompletableFuture<Object> interceptResultAsCompletionStage(Interceptor<?, ?> from) {
CompletableFutureContinuation completableFutureContinuation = new CompletableFutureContinuation(continuation);
replaceContinuation.accept(completableFutureContinuation);
Object result = context.proceed(from);
replaceContinuation.accept(continuation);
if (result != KotlinUtils.COROUTINE_SUSPENDED) {
completableFutureContinuation.resumeWith(result);
}
return completableFutureContinuation.getCompletableFuture();
}
@Override
public Object interceptResult() {
return interceptResultAsCompletionStage();
}
@Override
public Object interceptResult(Interceptor<?, ?> from) {
return interceptResultAsCompletionStage(from);
}
@Override
public Object handleResult(Object result) {
CompletionStage completionStageResult;
if (result instanceof CompletionStage) {
completionStageResult = (CompletionStage<?>) result;
} else {
throw new IllegalStateException("Cannot convert " + result + " to 'java.util.concurrent.CompletionStage'");
}
completionStageResult.whenComplete((value, throwable) -> {
if (throwable == null) {
if (value == null && isUnitValueType) {
value = kotlin.Unit.INSTANCE;
}
CompletableFutureContinuation.Companion.completeSuccess(continuation, value);
} else {
if (throwable instanceof CompletionException) {
throwable = ((CompletionException) throwable).getCause();
}
CompletableFutureContinuation.Companion.completeExceptionally(continuation, (Throwable) throwable);
}
});
return KotlinUtils.COROUTINE_SUSPENDED;
}
@Override
public <E extends Throwable> Object handleException(Exception exception) throws E {
CompletableFutureContinuation.Companion.completeExceptionally(continuation, exception);
return KotlinUtils.COROUTINE_SUSPENDED;
}
@Override
public CoroutineContext getCoroutineContext() {
return continuation.getContext();
}
@Override
public void updateCoroutineContext(CoroutineContext coroutineContext) {
continuation = new DelegatingContextContinuation(continuation, coroutineContext);
}
}