我正在实现我的第一个WorkManager
以与服务器进行日常同步,这可能会返回HTTP错误,因此会使createWork()
流失败并调用onError()
,因此Result.failure()
被“抛出”在流中订阅。
我想确保从不调用Result.failure()
并始终调用Result.retry()
。
这里是我的RxWorker
class DailySyncWorker (appContext: Context, workerParams: WorkerParameters): RxWorker(appContext, workerParams) {
private val disposable: CompositeDisposable = CompositeDisposable()
private val httpManager = AppFactory.httpManager()
private val dbManager = AppFactory.dbManager()
private val prefsManager = AppFactory.sharedManager(appContext)
companion object {
const val WORKER_NAME = "com.blabla.blah.DAILY_SYNC_WORKER"
}
override fun createWork(): Single<Result> {
Timber.e("Worker - Executing ${System.currentTimeMillis() - prefsManager.lastMillis}")
prefsManager.lastMillis = System.currentTimeMillis()
return dbManager.alarmDAO.getNewAlarms(prefsManager.lastSyncedAlarm)
.flatMap { alarms -> syncWithServer(alarms)
.doOnSuccess {
if(alarms.size != 0)
prefsManager.lastSyncedAlarm = alarms[0].date // The query is in descending order, the first record is the last recorded alarm
}
}
}
private fun syncWithServer(alarms: MutableList<Alarm>): Single<Result> {
val syncRequestModel = SyncRequestModel(alarms)
return if(alarms.size != 0)
httpManager.service().create(SyncService::class.java).sync(syncRequestModel)
.observeOn(Schedulers.io())
.flatMap { result ->
if(result == "OK") { // TODO - the service has not been created yet
Timber.e("Worker - success")
Single.just(Result.success())
} else {
Timber.e("Worker - failure")
Single.just(Result.retry())
}
}
else {
Timber.e("Worker - no sync is necessary")
Single.just(Result.success())
}
}
}
[我尝试在流程的许多不同Result.retry()
中调用onError()
,但是似乎在无法覆盖的订阅的Result.failure()
中调用了onError()
。
所以我如何确保我的工人永远不会失败?
在syncWithServer()
功能中,仅检查flatMap
部分中的结果。但是,在到达flatMap
部分之前可能会发生错误,这意味着Result.retry()
可能永远不会返回。另外,由于工作程序默认在后台线程上运行,因此您无需指定特定线程。这是我上面提到的有变化的您的工人:
class DailySyncWorker (appContext: Context, workerParams: WorkerParameters): RxWorker(appContext, workerParams) {
private val disposable: CompositeDisposable = CompositeDisposable()
private val httpManager = AppFactory.httpManager()
private val dbManager = AppFactory.dbManager()
private val prefsManager = AppFactory.sharedManager(appContext)
companion object {
const val WORKER_NAME = "com.blabla.blah.DAILY_SYNC_WORKER"
}
override fun createWork(): Single<Result> {
Timber.e("Worker - Executing ${System.currentTimeMillis() - prefsManager.lastMillis}")
prefsManager.lastMillis = System.currentTimeMillis()
return dbManager.alarmDAO.getNewAlarms(prefsManager.lastSyncedAlarm)
.flatMap { alarms -> syncWithServer(alarms)
.doOnSuccess {
if(alarms.size != 0)
prefsManager.lastSyncedAlarm = alarms[0].date // The query is in descending order, the first record is the last recorded alarm
}
}
.onErrorReturnItem(Result.retry()) // Here is error handling
}
private fun syncWithServer(alarms: MutableList<Alarm>): Single<Result> {
val syncRequestModel = SyncRequestModel(alarms)
return if(alarms.size != 0)
httpManager.service().create(SyncService::class.java).sync(syncRequestModel)
.flatMap { result ->
if(result == "OK") { // TODO - the service has not been created yet
Timber.e("Worker - success")
Single.just(Result.success())
} else {
Timber.e("Worker - failure")
Single.just(Result.retry())
}
}
else {
Timber.e("Worker - no sync is necessary")
Single.just(Result.success())
}
}
}