app/src/main/java/com/mizo0203/natureremoapisample/data/source/NatureRemoRepository.kt
/*
* Copyright 2019, Satoki Mizoguchi
*
* 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.mizo0203.natureremoapisample.data.source
import com.mizo0203.natureremoapisample.data.IRSignal
import com.mizo0203.natureremoapisample.util.AppExecutors
/**
* Concrete implementation to load tasks from the data sources into a cache.
*
*
* For simplicity, this implements a dumb synchronisation between locally persisted data and data
* obtained from the server, by using the remote data source only if the local database doesn't
* exist or is empty.
*/
class NatureRemoRepository(
private val appExecutors: AppExecutors,
private val localApiClient: NatureRemoLocalApiClient
) : NatureRemoDataSource {
override fun getMessages(callback: NatureRemoDataSource.Callback<IRSignal>) {
appExecutors.networkIO.execute {
val message = localApiClient.getMessages()
appExecutors.mainThread.execute {
message?.let { callback.onLoaded(it) } ?: callback.onDataNotAvailable()
}
}
}
override fun postMessages(message: IRSignal, callback: NatureRemoDataSource.Callback<Unit>) {
appExecutors.networkIO.execute {
val unit = localApiClient.postMessages(message)
appExecutors.mainThread.execute {
unit?.let { callback.onLoaded(it) } ?: callback.onDataNotAvailable()
}
}
}
companion object {
private var INSTANCE: NatureRemoRepository? = null
/**
* Returns the single instance of this class, creating it if necessary.
*
* @return the [NatureRemoRepository] instance
*/
@JvmStatic
fun getInstance(appExecutors: AppExecutors,
localApiClient: NatureRemoLocalApiClient) =
INSTANCE
?: synchronized(NatureRemoRepository::class.java) {
INSTANCE
?: NatureRemoRepository(appExecutors, localApiClient)
.also { INSTANCE = it }
}
/**
* Used to force [getInstance] to create a new instance
* next time it's called.
*/
@Suppress("unused")
@JvmStatic fun destroyInstance() {
INSTANCE = null
}
}
}