CoroutineTransactionMethodBinder.kt
/*
* Copyright 2019 The Android Open Source Project
*
* 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 androidx.room.solver.transaction.binder
import androidx.room.compiler.codegen.CodeLanguage
import androidx.room.compiler.codegen.XClassName
import androidx.room.compiler.codegen.XCodeBlock
import androidx.room.compiler.codegen.XMemberName.Companion.packageMember
import androidx.room.compiler.codegen.XPropertySpec
import androidx.room.compiler.codegen.XTypeName
import androidx.room.compiler.processing.XType
import androidx.room.ext.InvokeWithLambdaParameter
import androidx.room.ext.KotlinTypeNames
import androidx.room.ext.LambdaSpec
import androidx.room.ext.RoomTypeNames
import androidx.room.solver.CodeGenScope
import androidx.room.solver.transaction.result.TransactionMethodAdapter
/**
* Binder that knows how to write suspending transaction wrapper methods.
*/
class CoroutineTransactionMethodBinder(
private val returnType: XType,
adapter: TransactionMethodAdapter,
private val continuationParamName: String
) : TransactionMethodBinder(adapter) {
override fun executeAndReturn(
parameterNames: List<String>,
daoName: XClassName,
daoImplName: XClassName,
dbProperty: XPropertySpec,
scope: CodeGenScope
) {
val innerContinuationParamName = scope.getTmpVar("_cont")
val performBlock = InvokeWithLambdaParameter(
scope = scope,
functionName = RoomTypeNames.DB_UTIL.packageMember("performInTransactionSuspending"),
argFormat = listOf("%N"),
args = listOf(dbProperty),
continuationParamName = continuationParamName,
lambdaSpec = object : LambdaSpec(
parameterTypeName = KotlinTypeNames.CONTINUATION.parametrizedBy(
XTypeName.getConsumerSuperName(returnType.asTypeName())
),
parameterName = innerContinuationParamName,
returnTypeName = KotlinTypeNames.ANY,
javaLambdaSyntaxAvailable = scope.javaLambdaSyntaxAvailable
) {
override fun XCodeBlock.Builder.body(scope: CodeGenScope) {
val adapterScope = scope.fork()
adapter.createDelegateToSuperCode(
parameterNames = when (scope.language) {
CodeLanguage.JAVA -> parameterNames + innerContinuationParamName
CodeLanguage.KOTLIN -> parameterNames
},
daoName = daoName,
daoImplName = daoImplName,
scope = adapterScope
)
val returnPrefix = when (scope.language) {
CodeLanguage.JAVA -> "return "
CodeLanguage.KOTLIN -> ""
}
addStatement("$returnPrefix%L", adapterScope.generate())
}
}
)
scope.builder.add("return %L", performBlock)
}
}