I need your help since I'm struggling, I want to make some HTTP GET requests which allow me to retrieve each JSON object one by one in order to store them in a List which I will then put in an adapter. I intend to do it by incrementing idPlayer at each loop in the URL but given how the retrofit library was designed I wonder if this is possible.
Thx :)
fun getplayer() {
var instancePlayer = InstancePlayer()
var playerApi = instancePlayer.getPlayerAPI()
var call = playerApi?.getPlayer("/api/v1/players/" + idPlayer)
if (call != null) {
call.enqueue(object : Callback<Player?> {
override fun onResponse(call: Call<Player?>, response: Response<Player?>) {
var responseBody = response.body()!!
var p1: Player = Player()
p1.id = responseBody.id
p1.first_name = responseBody.first_name
p1.last_name = responseBody.last_name
playerAdapter.setData(playerList)
recyclerView?.setAdapter(playerAdapter)
playerList.add(p1)
}
override fun onFailure(call: Call<Player?>, t: Throwable) {
TODO("Not yet implemented")
}
})
}
}
Related
firebase method is working on worker thread automatically. but I have used coroutine and callbackflow to implement firebase listener code synchronously or get return from the listener.
below is my code that I explained
coroutine await with firebase for one shot
override suspend fun checkNickName(nickName: String): Results<Int> {
lateinit var result : Results<Int>
fireStore.collection("database")
.document("user")
.get()
.addOnCompleteListener { document ->
if (document.isSuccessful) {
val list = document.result.data?.get("nickNameList") as List<String>
if (list.contains(nickName))
result = Results.Exist(1)
else
result = Results.No(0)
//document.getResult().get("nickNameList")
}
else {
}
}.await()
return result
}
callbackflow with firebase listener
override fun getOwnUser(): Flow<UserEntity> = callbackFlow{
val document = fireStore.collection("database/user/userList/")
.document("test!!!!!")
val subscription = document.addSnapshotListener { snapshot,_ ->
if (snapshot!!.exists()) {
val ownUser = snapshot.toObject<UserEntity>()
if (ownUser != null) {
trySend(ownUser)
}
}
}
awaitClose { subscription.remove() }
}
so I really wonder these way is good or bad practice and its reason
Do not combine addOnCompleteListener with coroutines await(). There is no guarantee that the listener gets called before or after await(), so it is possible the code in the listener won't be called until after the whole suspend function returns. Also, one of the major reasons to use coroutines in the first place is to avoid using callbacks. So your first function should look like:
override suspend fun checkNickName(nickName: String): Results<Int> {
try {
val userList = fireStore.collection("database")
.document("user")
.get()
.await()
.get("nickNameList") as List<String>
return if (userList.contains(nickName)) Results.Exist(1) else Results.No(0)
} catch (e: Exception) {
// return a failure result here
}
}
Your use of callbackFlow looks fine, except you should add a buffer() call to the flow you're returning so you can specify how to handle backpressure. However, it's possible you will want to handle that downstream instead.
override fun getOwnUser(): Flow<UserEntity> = callbackFlow {
//...
}.buffer(/* Customize backpressure behavior here */)
I have a model with default values. My app gets the data from user through EditTexts and add them to Firebase Firestore. I hava an addData function (in AddAnalyzeActivity) and savefunction (in AddAnalyzeViewModel) for this operation. I'm getting EditText entries in AddAnalyzeActivity and adding them to my model but on this step ı want to add document id to my model but I can't access the documentIds properly in AddAnalyzeActivity. I can only access them with a forEach method when I try to retrieving the mentioned data with retrieveData function (in PairDetailVM) from Firestore but If I try to add document Ids in retrieveData method it only adds default value of documentId.
What I tried to:
Using #DocumentId annotation in my model.
Setting null default value of documentId in my model.
Getting a list of all documents' ids but can't match them with actual items.
Here is the screenShot for logic:
AnalyzeModel:
data class AnalyzeModel(
var concept: String?="",
var reason: String?="",
var result: String?="",
var rrRatio: Double?=0.0,
var tarih: Timestamp=Timestamp.now(),
var tradingViewUrl: String="",
var id : String="")
addData :
fun addData(view: View) {
val tarih = com.google.firebase.Timestamp.now()
val rr = rrText.text.toString()
var doubleRR = rr.toDoubleOrNull()
if (doubleRR == null) { doubleRR = 0.0 }
val analyzeDTO = AnalyzeModel(
conceptText.text.toString(),
reasonForText.text.toString(),
resultAddingText.text.toString(),
doubleRR,
tarih,
chartImage.text.toString()
)
viewModel.save(analyzeDTO)
val intent = Intent(this, PairDetailActivity::class.java)
startActivity(intent)
finish()
}
save :
fun save(data: AnalyzeModel) {
database.collection(dbCollection!!).document("Specified").collection("Pairs")
.document(chosenPair!!)
.collection("Analysis")
.add(data)
.addOnFailureListener { exception ->
exception.printStackTrace()
Toast.makeText(getApplication(), exception.localizedMessage, Toast.LENGTH_LONG).show()
}
}
retrieveData:
private fun retrieveData() {
val docRef = collectionRef.orderBy("tarih", Query.Direction.DESCENDING)
docRef.addSnapshotListener { value, error ->
try {
if (value != null && !value.isEmpty) {
val allAnalysis= ArrayList<AnalyzeModel>()
val documents = value.documents
documents.forEach {
val analyze = it.toObject(AnalyzeModel::class.java)
if (analyze!=null){
allAnalysis.add(analyze)
}
}
list.value = allAnalysis
} else if (error != null) {
Toast.makeText(Application(), error.localizedMessage, Toast.LENGTH_LONG).show()
}
} catch (e: Exception) {
e.printStackTrace()
}
}
}
If you want to save the document ID into the document itself, consider separating the creation of the new DocumentReference from writing to it, by using set instead of add.
fun save(data: AnalyzeModel) {
val newRef = database.collection(dbCollection!!).document("Specified").collection("Pairs")
.document(chosenPair!!)
.collection("Analysis")
.document() // 👈 generates a new reference with a unique ID
data.id = newRef.id // 👈 set the ID into your object
newRef.set(data) // 👈 writes the data to the new reference
.addOnFailureListener { exception ->
exception.printStackTrace()
Toast.makeText(getApplication(), exception.localizedMessage, Toast.LENGTH_LONG).show()
}
}
Also see the second snippet in the documentation on adding a document
I am using Vertx. 4.0.3 and trying to stream a request body directly to a file. For that purpose I am using the following (Kotlin) code:
router.post("/upload").handler { ctx ->
val startTime = System.currentTimeMillis()
val response = ctx.response()
val request = ctx.request()
val fs = vertx.fileSystem()
fs.open("data.bin", OpenOptions()) { res ->
if (res.succeeded()) {
val asyncFile = res.result()
request.pipeTo(asyncFile).onComplete { writeResult ->
if(writeResult.succeeded()) {
response.end("${System.currentTimeMillis() - startTime}")
} else {
response.setStatusCode(500).end(res.cause().stackTraceToString())
}
}
} else {
response.setStatusCode(500).end(res.cause().stackTraceToString())
}
}
}
Unfortunately I am getting an exception like:
java.lang.IllegalStateException: Request has already been read
at io.vertx.core.http.impl.Http1xServerRequest.checkEnded(Http1xServerRequest.java:628)
at io.vertx.core.http.impl.Http1xServerRequest.endHandler(Http1xServerRequest.java:334)
at io.vertx.core.http.impl.Http1xServerRequest.endHandler(Http1xServerRequest.java:60)
at io.vertx.core.streams.impl.PipeImpl.<init>(PipeImpl.java:35)
at io.vertx.core.streams.ReadStream.pipeTo(ReadStream.java:119)
at io.vertx.ext.web.impl.HttpServerRequestWrapper.pipeTo(HttpServerRequestWrapper.java:410)
at fileupload.AppKt$main$2$1.handle(App.kt:60)
at fileupload.AppKt$main$2$1.handle(App.kt)
at io.vertx.core.impl.future.FutureImpl$3.onSuccess(FutureImpl.java:124)
at io.vertx.core.impl.future.FutureBase.lambda$emitSuccess$0(FutureBase.java:54)
at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:164)
at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:472)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:497)
at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989)
at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
at java.base/java.lang.Thread.run(Thread.java:834)
Since I do nothing to the request I have no idea where my request is already read. Can someone please give me some insights into this? Thanks!
This happens because by the time the callback of fs.open is invoked, the request has been fully read already.
You must pause the request before opening the file and resume it after:
router.post("/upload").handler { ctx ->
val startTime = System.currentTimeMillis()
val response = ctx.response()
val request = ctx.request()
val fs = vertx.fileSystem()
// Pause
request.pause()
fs.open("data.bin", OpenOptions()) { res ->
// Resume
request.resume()
if (res.succeeded()) {
val asyncFile = res.result()
request.pipeTo(asyncFile).onComplete { writeResult ->
if(writeResult.succeeded()) {
response.end("${System.currentTimeMillis() - startTime}")
} else {
response.setStatusCode(500).end(res.cause().stackTraceToString())
}
}
} else {
response.setStatusCode(500).end(res.cause().stackTraceToString())
}
}
}
Vert.x for Kotlin provide a equivalent set of suspend functions. In your case you may want to implement the equivalent openAwait and pipeToAwait functions in order to avoid the "callback hell". Now your code might look like this:
router.post("/upload").handler { ctx ->
val startTime = System.currentTimeMillis()
val response = ctx.response()
val request = ctx.request()
val fs = vertx.fileSystem()
val asyncFile = fs.openAwait("data.bin", OpenOptions())
val result = request.pipeToAwait(asyncFile)
// code for sending http response
}
In the firestore I created a field named PararUm, type number (it does not have Int, when I enter it manually) and I put value 1.
The problem is that the return has been PararUm(PararUm=1) and not just 1.
(99-below)
When I resolved this, I would have solved the first part of the project.
Regarding the second, I want to use kotlinx.coroutines to work within a while/loop (which queries the value of the PararUm field) in a synchronous, non-asynchronous way (as firebase requires)
Can I do something like???(999-below):
I threw this topic down, but I was not happy1.
99-below:
model
#IgnoreExtraProperties
data class PararUm(
var PararUm: Int? = 0
)
Activity
var db = FirebaseFirestore.getInstance()
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
var pararumRef =
db.collection("smartmodel").document("xxxxxxxxxxxx")
pararumRef.get().addOnSuccessListener { documentSnapshot ->
var PararUm = documentSnapshot.toObject(PararUm::class.java)
Log.i(ContentValues.TAG, "1999 1999 1999" + PararUm)
}
}
999-below:
while (!FCMotorUmA.value) {
var snapshot = pararumRef.get().await()
var pararum = snapshot.toObject(PararUM::class.java)
if (pararum.equals(0)) {
// Do something 1
} else if (pararum.equals(1)) {
// Do something 2
}
}
Given this Model:
public class RSS2Feed {
public var channel: RSS2FeedChannel?
public init() {}
}
public class RSS2FeedChannel {
public var title: String?
public var description: String?
public init() {}
}
What would I need to do in order to get the property names and values of an RSS2FeedChannel instance?
Here's what I'm trying:
let feed = RSS2Feed()
feed.channel = RSS2FeedChannel()
feed.channel?.title = "The Channel Title"
let mirror = Mirror(reflecting: feed.channel)
mirror.children.first // ({Some "Some"}, {{Some "The Channel Title...
for (index, value) in mirror.children.enumerate() {
index // 0
value.label // "Some"
value.value // RSS2FeedChannel
}
Ultimately, I'm trying to create a Dictionary that matches the instance, using reflection, but so far I'm unable to get the properties name and values of the instance.
Documentation says that:
The optional label may be used when appropriate, e.g. to represent the name of a stored property or of an active enum case, and will be used for lookup when Strings are passed to the descendant method.
Yet I only get a "Some" string.
Also, the value property is returning a string with the Type RSS2FeedChannel when I would expect each children to be "An element of the reflected instance's structure."!
When i understand correct this should solve ur problem:
func aMethod() -> Void {
let feed = RSS2Feed()
feed.channel = RSS2FeedChannel()
feed.channel?.title = "The Channel Title"
// feed.channel?.description = "the description of your channel"
guard let channel = feed.channel else {
return
}
let mirror = Mirror(reflecting: channel)
for child in mirror.children {
guard let key = child.label else {
continue
}
let value = child.value
guard let result = self.unwrap(value) else {
continue
}
print("\(key): \(result)")
}
}
private func unwrap(subject: Any) -> Any? {
var value: Any?
let mirrored = Mirror(reflecting:subject)
if mirrored.displayStyle != .Optional {
value = subject
} else if let firstChild = mirrored.children.first {
value = firstChild.value
}
return value
}
just some little changes for swift 3:
private func unwrap(_ subject: Any) -> Any? {
var value: Any?
let mirrored = Mirror(reflecting:subject)
if mirrored.displayStyle != .optional {
value = subject
} else if let firstChild = mirrored.children.first {
value = firstChild.value
}
return value
}
You can use the descendent method on the Mirror object to get this information. It will return nil if the values aren't found or the optionals contain no value.
let mirror = Mirror(reflecting: feed.channel)
let child1 = mirror.descendant("Some", "title") // "The Channel Title"
// or on one line
let child3 = Mirror(reflecting: feed).descendant("channel", "Some", "title")