io.micronaut.kotlin.converters.FlowPublisherConverterRegistrar.kt Maven / Gradle / Ivy

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/*
 * Copyright 2017-2022 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.kotlin.converters

import io.micronaut.context.annotation.Prototype
import io.micronaut.context.annotation.Requires
import io.micronaut.core.annotation.Internal
import io.micronaut.core.convert.MutableConversionService
import io.micronaut.core.convert.TypeConverterRegistrar
import kotlinx.coroutines.flow.Flow
import kotlinx.coroutines.reactive.asFlow
import kotlinx.coroutines.reactive.asPublisher
import org.reactivestreams.Publisher

/**
 * Converts between a {@link Flow} and a {@link Publisher}.
 *
 * @author Konrad Kamiński
 * @since 1.3
 */
@Requires(classes = [Flow::class, Publisher::class])
@Prototype
@Internal
class FlowPublisherConverterRegistrar : TypeConverterRegistrar {
    override fun register(conversionService: MutableConversionService) {
        conversionService.addConverter(
            Flow::class.java,
            Publisher::class.java
        ) { flow -> (flow as Flow).asPublisher() }
        conversionService.addConverter(
            Publisher::class.java,
            Flow::class.java
        ) { publisher -> publisher.asFlow() }
    }
}