commonMain.com.fraktalio.fmodel.application.SagaManagerArrowExtension.kt Maven / Gradle / Ivy

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/*
 * Copyright (c) 2021 Fraktalio D.O.O. All rights reserved.
 *
 * 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 com.fraktalio.fmodel.application

import arrow.core.Either
import kotlinx.coroutines.FlowPreview
import kotlinx.coroutines.flow.Flow
import kotlinx.coroutines.flow.catch
import kotlinx.coroutines.flow.flatMapConcat
import kotlinx.coroutines.flow.map

/**
 * Extension function - Handles the action result of type [AR].
 *
 * @param actionResult Action Result represent the outcome of some action you want to handle in some way
 * @return [Flow] of [Either] [Error] or Actions of type [A]
 *
 * @author Иван Дугалић / Ivan Dugalic / @idugalic
 */
fun  SagaManager.handleEither(actionResult: AR): Flow> =
    actionResult
        .computeNewActions()
        .publish()
        .map { Either.Right(it) }
        .catch> { emit(Either.Left(Error.ActionResultHandlingFailed(actionResult))) }

/**
 * Extension function - Handles the the [Flow] of action results of type [AR].
 *
 * @param actionResults Action Results represent the outcome of some action you want to handle in some way
 * @return [Flow] of [Either] [Error] or Actions of type [A]
 *
 * @author Иван Дугалић / Ivan Dugalic / @idugalic
 */
@FlowPreview
fun  SagaManager.handleEither(actionResults: Flow): Flow> =
    actionResults
        .flatMapConcat { handleEither(it) }
        .catch { emit(Either.Left(Error.ActionResultPublishingFailed(it))) }


/**
 * Extension function - Publishes the action result of type [AR] to the saga manager of type  [SagaManager]<[AR], [A]>
 * @receiver action result of type [AR]
 * @param sagaManager of type [SagaManager]<[AR], [A]>
 * @return the [Flow] of [Either] [Error] or successfully published Actions of type [A]
 *
 * @author Иван Дугалић / Ivan Dugalic / @idugalic
 */
fun  AR.publishEitherTo(sagaManager: SagaManager): Flow> = sagaManager.handleEither(this)

/**
 * Extension function - Publishes the action result of type [AR] to the saga manager of type  [SagaManager]<[AR], [A]>
 * @receiver [Flow] of action results of type [AR]
 * @param sagaManager of type [SagaManager]<[AR], [A]>
 * @return the [Flow] of [Either] [Error] or successfully published Actions of type [A]
 *
 * @author Иван Дугалић / Ivan Dugalic / @idugalic
 */
@FlowPreview
fun  Flow.publishEitherTo(sagaManager: SagaManager): Flow> =
    sagaManager.handleEither(this)