com.zeoflow.depot.solver.transaction.binder.InstantTransactionMethodBinder.kt Maven / Gradle / Ivy

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The Depot persistence library provides an abstraction layer over SQLite to allow for more robust database access while using the full power of SQLite.

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/*
 * Copyright (C) 2021 ZeoFlow SRL
 *
 * 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.zeoflow.depot.solver.transaction.binder

import com.zeoflow.depot.ext.N
import com.zeoflow.depot.compiler.processing.XType
import com.zeoflow.depot.ext.isNotVoid
import com.zeoflow.depot.solver.CodeGenScope
import com.zeoflow.depot.solver.transaction.result.TransactionMethodAdapter
import com.squareup.javapoet.ClassName
import com.squareup.javapoet.FieldSpec

/**
 * Binder that knows how to write instant (blocking) transaction wrapper methods.
 */
class InstantTransactionMethodBinder(
    adapter: TransactionMethodAdapter
) : TransactionMethodBinder(adapter) {
    override fun executeAndReturn(
        returnType: XType,
        parameterNames: List,
        daoName: ClassName,
        daoImplName: ClassName,
        dbField: FieldSpec,
        scope: CodeGenScope
    ) {
        scope.builder().apply {
            addStatement("$N.beginTransaction()", dbField)
            beginControlFlow("try").apply {
                val returnsValue = returnType.isNotVoid()
                val resultVar = if (returnsValue) {
                    scope.getTmpVar("_result")
                } else {
                    null
                }

                val adapterScope = scope.fork()
                adapter.createDelegateToSuperStatement(
                    returnType = returnType,
                    parameterNames = parameterNames,
                    daoName = daoName,
                    daoImplName = daoImplName,
                    resultVar = resultVar,
                    scope = adapterScope
                )
                add(adapterScope.generate())

                addStatement("$N.setTransactionSuccessful()", dbField)
                if (returnsValue) {
                    addStatement("return $N", resultVar)
                }
            }
            nextControlFlow("finally").apply {
                addStatement("$N.endTransaction()", dbField)
            }
            endControlFlow()
        }
    }
}