Singleton repository class
This commit is contained in:
Philipp Heckel
parent
b25ce1f06a
commit
638c8f093a
5 changed files with 134 additions and 167 deletions
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@ -41,7 +41,7 @@ const val TOPIC_URL = "url"
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class MainActivity : AppCompatActivity() {
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private val newTopicActivityRequestCode = 1
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private val topicsViewModel by viewModels<TopicsViewModel> {
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TopicsViewModelFactory(this)
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TopicsViewModelFactory()
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}
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override fun onCreate(savedInstanceState: Bundle?) {
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@ -1,116 +1,46 @@
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/*
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* Copyright (C) 2020 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package io.heckel.ntfy
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package io.heckel.ntfy.list
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import android.content.Context
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import androidx.lifecycle.*
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import com.google.gson.GsonBuilder
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import com.google.gson.JsonObject
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import com.google.gson.JsonSyntaxException
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import io.heckel.ntfy.data.DataSource
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import androidx.lifecycle.LiveData
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import androidx.lifecycle.ViewModel
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import androidx.lifecycle.ViewModelProvider
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import androidx.lifecycle.viewModelScope
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import io.heckel.ntfy.data.TopicsRepository
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import io.heckel.ntfy.data.Topic
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import kotlinx.coroutines.*
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import kotlinx.coroutines.flow.Flow
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import kotlinx.coroutines.flow.flow
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import java.io.IOException
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import java.net.HttpURLConnection
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import java.net.URL
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import kotlin.collections.List
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data class Notification(val topic: String, val message: String)
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typealias NotificationListener = (notification: Notification) -> Unit
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class TopicsViewModel(val datasource: DataSource) : ViewModel() {
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private val gson = GsonBuilder().create()
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private val jobs = mutableMapOf<Long, Job>()
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private var notificationListener: NotificationListener? = null;
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class TopicsViewModel(private val repository: TopicsRepository) : ViewModel() {
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fun add(topic: Topic) {
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println("Adding topic $topic $this")
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datasource.add(topic)
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jobs[topic.id] = subscribeTopic(topic.url)
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repository.add(topic, viewModelScope)
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}
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fun get(id: Long) : Topic? {
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return datasource.get(id)
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return repository.get(id)
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}
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fun list(): LiveData<List<Topic>> {
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return datasource.list()
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return repository.list()
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}
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fun remove(topic: Topic) {
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println("Removing topic $topic $this")
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jobs[topic.id]?.cancel()
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println("${jobs[topic.id]}")
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jobs.remove(topic.id)?.cancel() // Cancel and remove
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println("${jobs[topic.id]}")
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datasource.remove(topic)
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repository.remove(topic)
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}
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fun setNotificationListener(listener: NotificationListener) {
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notificationListener = listener
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}
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private fun subscribeTopic(url: String): Job {
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return viewModelScope.launch(Dispatchers.IO) {
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while (isActive) {
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openURL(this, url)
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delay(5000) // TODO exponential back-off
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}
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}
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}
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private fun openURL(scope: CoroutineScope, url: String) {
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println("Connecting to $url ...")
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val conn = (URL(url).openConnection() as HttpURLConnection).also {
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it.doInput = true
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}
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try {
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val input = conn.inputStream.bufferedReader()
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while (scope.isActive) {
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val line = input.readLine() ?: break // Exit if null
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try {
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val json = gson.fromJson(line, JsonObject::class.java) ?: break // Exit if null
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if (!json.isJsonNull && json.has("message")) {
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val message = json.get("message").asString
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notificationListener?.let { it(Notification(url, message)) }
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}
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} catch (e: JsonSyntaxException) {
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// Ignore invalid JSON
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}
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}
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} catch (e: IOException) {
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println("PHIL: " + e.message)
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} finally {
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conn.disconnect()
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}
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println("Connection terminated: $url")
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repository.setNotificationListener(listener)
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}
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}
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class TopicsViewModelFactory(private val context: Context) : ViewModelProvider.Factory {
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override fun <T : ViewModel> create(modelClass: Class<T>): T {
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if (modelClass.isAssignableFrom(TopicsViewModel::class.java)) {
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class TopicsViewModelFactory() : ViewModelProvider.Factory {
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@Suppress("UNCHECKED_CAST")
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return TopicsViewModel(
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datasource = DataSource.getDataSource(context.resources)
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) as T
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}
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throw IllegalArgumentException("Unknown ViewModel class")
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override fun <T : ViewModel?> create(modelClass: Class<T>) =
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with(modelClass){
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when {
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isAssignableFrom(TopicsViewModel::class.java) -> TopicsViewModel(TopicsRepository.getInstance()) as T
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else -> throw IllegalArgumentException("Unknown viewModel class $modelClass")
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}
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}
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}
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@ -1,72 +0,0 @@
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/*
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* Copyright (C) 2020 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package io.heckel.ntfy.data
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import android.content.res.Resources
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import androidx.lifecycle.LiveData
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import androidx.lifecycle.MutableLiveData
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/* Handles operations on topicsLiveData and holds details about it. */
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class DataSource(resources: Resources) {
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private val topicsLiveData: MutableLiveData<List<Topic>> = MutableLiveData(mutableListOf())
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/* Adds topic to liveData and posts value. */
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fun add(topic: Topic) {
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val currentList = topicsLiveData.value
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if (currentList == null) {
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topicsLiveData.postValue(listOf(topic))
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} else {
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val updatedList = currentList.toMutableList()
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updatedList.add(0, topic)
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topicsLiveData.postValue(updatedList)
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}
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}
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/* Removes topic from liveData and posts value. */
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fun remove(topic: Topic) {
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val currentList = topicsLiveData.value
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if (currentList != null) {
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val updatedList = currentList.toMutableList()
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updatedList.remove(topic)
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topicsLiveData.postValue(updatedList)
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}
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}
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/* Returns topic given an ID. */
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fun get(id: Long): Topic? {
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topicsLiveData.value?.let { topics ->
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return topics.firstOrNull{ it.id == id}
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}
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return null
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}
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fun list(): LiveData<List<Topic>> {
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return topicsLiveData
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}
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companion object {
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private var instance: DataSource? = null
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fun getDataSource(resources: Resources): DataSource {
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return synchronized(DataSource::class) {
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val newInstance = instance ?: DataSource(resources)
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instance = newInstance
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newInstance
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}
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}
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}
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}
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109
app/src/main/java/io/heckel/ntfy/data/TopicsRepository.kt
Normal file
109
app/src/main/java/io/heckel/ntfy/data/TopicsRepository.kt
Normal file
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@ -0,0 +1,109 @@
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package io.heckel.ntfy.data
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import androidx.lifecycle.LiveData
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import androidx.lifecycle.MutableLiveData
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import com.google.gson.GsonBuilder
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import com.google.gson.JsonObject
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import com.google.gson.JsonSyntaxException
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import io.heckel.ntfy.Notification
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import io.heckel.ntfy.NotificationListener
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import kotlinx.coroutines.*
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import java.io.IOException
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import java.net.HttpURLConnection
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import java.net.URL
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/* Handles operations on topicsLiveData and holds details about it. */
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class TopicsRepository {
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private val topics: MutableLiveData<List<Topic>> = MutableLiveData(mutableListOf())
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private val jobs = mutableMapOf<Long, Job>()
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private val gson = GsonBuilder().create()
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private var notificationListener: NotificationListener? = null;
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/* Adds topic to liveData and posts value. */
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fun add(topic: Topic, scope: CoroutineScope) {
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val currentList = topics.value
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if (currentList == null) {
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topics.postValue(listOf(topic))
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} else {
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val updatedList = currentList.toMutableList()
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updatedList.add(0, topic)
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topics.postValue(updatedList)
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}
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jobs[topic.id] = subscribeTopic(topic, scope)
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}
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/* Removes topic from liveData and posts value. */
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fun remove(topic: Topic) {
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val currentList = topics.value
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if (currentList != null) {
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val updatedList = currentList.toMutableList()
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updatedList.remove(topic)
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topics.postValue(updatedList)
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}
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jobs.remove(topic.id)?.cancel() // Cancel and remove
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}
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/* Returns topic given an ID. */
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fun get(id: Long): Topic? {
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topics.value?.let { topics ->
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return topics.firstOrNull{ it.id == id}
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}
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return null
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}
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fun list(): LiveData<List<Topic>> {
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return topics
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}
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fun setNotificationListener(listener: NotificationListener) {
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notificationListener = listener
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}
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private fun subscribeTopic(topic: Topic, scope: CoroutineScope): Job {
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return scope.launch(Dispatchers.IO) {
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while (isActive) {
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openURL(this, topic.url, topic.url) // TODO
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delay(5000) // TODO exponential back-off
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}
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}
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}
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private fun openURL(scope: CoroutineScope, topic: String, url: String) {
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println("Connecting to $url ...")
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val conn = (URL(url).openConnection() as HttpURLConnection).also {
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it.doInput = true
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}
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try {
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val input = conn.inputStream.bufferedReader()
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while (scope.isActive) {
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val line = input.readLine() ?: break // Exit if null
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try {
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val json = gson.fromJson(line, JsonObject::class.java) ?: break // Exit if null
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if (!json.isJsonNull && json.has("message")) {
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val message = json.get("message").asString
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notificationListener?.let { it(Notification(url, message)) }
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}
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} catch (e: JsonSyntaxException) {
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// Ignore invalid JSON
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}
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}
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} catch (e: IOException) {
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println("PHIL: " + e.message)
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} finally {
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conn.disconnect()
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}
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println("Connection terminated: $url")
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}
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companion object {
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private var instance: TopicsRepository? = null
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fun getInstance(): TopicsRepository {
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return synchronized(TopicsRepository::class) {
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val newInstance = instance ?: TopicsRepository()
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instance = newInstance
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newInstance
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}
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}
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}
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}
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@ -23,12 +23,12 @@ import androidx.activity.viewModels
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import androidx.appcompat.app.AppCompatActivity
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import io.heckel.ntfy.R
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import io.heckel.ntfy.TOPIC_ID
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import io.heckel.ntfy.list.TopicsViewModel
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import io.heckel.ntfy.list.TopicsViewModelFactory
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import io.heckel.ntfy.TopicsViewModel
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import io.heckel.ntfy.TopicsViewModelFactory
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class DetailActivity : AppCompatActivity() {
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private val topicsViewModel by viewModels<TopicsViewModel> {
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TopicsViewModelFactory(this)
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TopicsViewModelFactory()
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}
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override fun onCreate(savedInstanceState: Bundle?) {
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