InstantTransactionMethodBinder.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.XPropertySpec
import androidx.room.compiler.processing.XType
import androidx.room.compiler.processing.isKotlinUnit
import androidx.room.ext.KotlinTypeNames
import androidx.room.ext.isNotKotlinUnit
import androidx.room.ext.isNotVoid
import androidx.room.solver.CodeGenScope
import androidx.room.solver.transaction.result.TransactionMethodAdapter
/**
* Binder that knows how to write instant (blocking) transaction wrapper methods.
*/
class InstantTransactionMethodBinder(
adapter: TransactionMethodAdapter
) : TransactionMethodBinder(adapter) {
override fun executeAndReturn(
returnType: XType,
parameterNames: List<String>,
daoName: XClassName,
daoImplName: XClassName,
dbProperty: XPropertySpec,
scope: CodeGenScope
) {
scope.builder.apply {
addStatement("%N.beginTransaction()", dbProperty)
beginControlFlow("try").apply {
val returnsValue = returnType.isNotVoid() && returnType.isNotKotlinUnit()
val resultVar = if (returnsValue) {
scope.getTmpVar("_result")
} else {
null
}
if (resultVar != null) {
addLocalVariable(
name = resultVar,
typeName = returnType.asTypeName()
)
}
val adapterScope = scope.fork()
adapter.createDelegateToSuperCode(
parameterNames = parameterNames,
daoName = daoName,
daoImplName = daoImplName,
resultVar = resultVar,
scope = adapterScope
)
addStatement("%L", adapterScope.generate())
addStatement("%N.setTransactionSuccessful()", dbProperty)
if (resultVar != null) {
addStatement("return %N", resultVar)
} else if (returnType.isKotlinUnit() && language == CodeLanguage.JAVA) {
addStatement("return %T.INSTANCE", KotlinTypeNames.UNIT)
}
}
nextControlFlow("finally").apply {
addStatement("%N.endTransaction()", dbProperty)
}
endControlFlow()
}
}
}