fetch estates with update

app/build.gradle

@@ -175,6 +175,10 @@ dependencies {
     //RxKotlin
     implementation("io.reactivex.rxjava2:rxkotlin:$rxKotlinVersion")
 
+
+    //Arch Lifecycle
+    implementation 'androidx.lifecycle:lifecycle-extensions:2.2.0'
+
     //Tests
     testImplementation 'junit:junit:4.12'
     androidTestImplementation 'androidx.test:runner:1.2.0'

app/src/main/java/com/biganto/visual/roompark/data/data_provider/EstateRepository.kt

@@ -16,6 +16,7 @@ import com.biganto.visual.roompark.domain.model.EstateModel
 import com.biganto.visual.roompark.domain.model.fromEntity
 import io.reactivex.Completable
 import io.reactivex.Observable
+import io.reactivex.rxkotlin.Observables
 import io.reactivex.schedulers.Schedulers
 import timber.log.Timber
 import javax.inject.Inject
@@ -37,17 +38,31 @@ class EstateRepository @Inject constructor(
         Timber.d("Estate Repository Created $this")
     }
 
-    override fun fetchFavorites(user:UserEntity): Observable<Iterable<EstateEntity>> =
+    override fun fetchFavorites(user:UserEntity): Observable<List<EstateEntity>> =
+        Observables.zip(
         api.getFavorites(user.authToken)
             .doOnError(Timber::e)
             .map { fromRawList(it, ::fromRaw) }
-            .doOnNext {
-                it.forEach { estate ->
-                    estate.setFavorite(true)
-                    estate.user = user
-                }
+            ,db.getUserFavorites(user.uuid)
+                .defaultIfEmpty(null).toList().toObservable()
+                .doOnError(Timber::e)
+        ){apiList,dbList ->
+            if (dbList.isEmpty())
+                return@zip apiList
+            dbList
+                .filterNotNull()
+                .filter {dbFav -> apiList.map{it.id}.contains(dbFav.id) }
+                .let{ db.deleteEstate(it) }
+
+            apiList.forEach { estate ->
+                estate.setFavorite(true)
+                estate.user = user
             }
+
+            return@zip apiList
+        }
             .flatMap(db::upsertEstates)
+            .map { it.toList() }
             .doOnNext{ db.refreshUser(user) }
 
     override fun fetchDeals(user:UserEntity): Observable<List<EstateEntity>> =
@@ -80,7 +95,7 @@ class EstateRepository @Inject constructor(
                     .doOnNext{ db.refreshUser(user) }
             }
 
-    private val getFavoritesDb: Observable<List<EstateEntity>> =
+    private val getFavoritesDb: Observable<MutableList<EstateEntity?>>? =
         local.recentUser()
             .flatMap {
                 when (it) {
@@ -95,12 +110,14 @@ class EstateRepository @Inject constructor(
             }
 
 
-    override fun getFavorites(): Observable<List<EstateModel>> {
+    override fun getFavorites(user:UserEntity): Observable<List<EstateModel>> {
         return Observable.mergeDelayError(
             arrayListOf(
-                getFavoritesApi, getFavoritesDb
+                fetchFavorites(user), getFavoritesDb
             )
-        ).map { fromEntity(it, ::fromEntity) }
+        )
+            .map { it.filterNotNull() }
+            .map { fromEntity(it, ::fromEntity) }
             .doOnError(Timber::e)
     }
 

app/src/main/java/com/biganto/visual/roompark/data/memcache/EntityCache.kt

+package com.biganto.visual.roompark.data.memcache
+
+import androidx.lifecycle.Lifecycle
+import androidx.lifecycle.LifecycleObserver
+import androidx.lifecycle.OnLifecycleEvent
+import androidx.lifecycle.ProcessLifecycleOwner
+import com.jakewharton.rxrelay2.Relay
+import com.jakewharton.rxrelay2.ReplayRelay
+import io.reactivex.Observable
+import io.reactivex.disposables.CompositeDisposable
+import timber.log.Timber
+import java.util.concurrent.ConcurrentHashMap
+import java.util.concurrent.TimeUnit
+
+/**
+ * Created by Vladislav Bogdashkin on 19.10.2018.
+ */
+
+
+/**
+ * @param[maxSize] max entries count before automatic save && flush
+ * @param[flushInterval] time without any actions with cache in SECONDS before automatic save && flush
+ * */
+abstract class EntityCache<K,V>
+
+constructor(
+    private val maxSize: Int = 300,
+    private val flushInterval: Long = TimeUnit.MINUTES.toSeconds(1)
+
+) : Cache<K,V> {
+
+    private val disposable = CompositeDisposable()
+    protected abstract fun saveDelegate  (values:List<V>)
+    protected abstract fun readDelegate  (key:K) : V?
+    protected abstract fun deleteDelegate  (value:V)
+
+    protected val notifier: Relay<V> = ReplayRelay.create<V>().toSerialized()
+
+    init {
+        disposable.addAll(
+            Observable.interval(flushInterval, flushInterval, TimeUnit.SECONDS)
+                .doOnTerminate { clear() }
+                .doOnDispose { clear() }
+                .subscribe { clear() }
+        )
+    }
+
+    override fun contains(key: K): Boolean = keyMap.containsKey(key)
+
+    protected val locker = Any()
+
+    private var lastFlushTime = System.nanoTime()
+
+    private val keyMap = ConcurrentHashMap<K, V>()
+
+    override val size: Int
+        get() = keyMap.size
+
+    override val toList
+        get() = keyMap.toList()
+
+    fun deleteEntity(key: K){
+        synchronized(locker) {
+            deleteItem(key)
+        }
+    }
+
+    private fun deleteItem(key:K){
+        synchronized(locker) {
+            lastFlushTime = System.nanoTime()
+            var toDelete = keyMap.remove(key)
+            if (toDelete == null)
+                toDelete = readDelegate(key)
+            if (toDelete == null) return // -> нет в хранилище
+            deleteDelegate(value = toDelete)
+        }
+    }
+
+    fun deleteEntitys(keys: List<K>){
+        synchronized(locker) {
+            keys.forEach { deleteItem(it)}
+        }
+    }
+
+    override fun set(key: K, value: V?) {
+        synchronized(locker) {
+            lastFlushTime = System.nanoTime()
+            if (keyMap.size > maxSize)
+                clear()
+            value?.let {
+                keyMap[key]=it
+                notifier.accept(it)
+            }
+        }
+    }
+
+    override fun remove(key: K) = keyMap.remove(key)
+
+    override fun get(key: K): V? {
+        synchronized(locker) {
+            lastFlushTime = System.nanoTime()
+            return keyMap[key] ?: readDelegate(key)
+        }
+    }
+
+
+    override fun saveAll(){
+        synchronized(locker)
+        {
+            if (keyMap.size > 0) {
+                Timber.d("Going to save items: ${keyMap.values.size}")
+                saveDelegate(keyMap.values.toList())
+            }
+        }
+    }
+
+    override fun clear() {
+        if (keyMap.size == 0) return
+        synchronized(locker)
+        {
+            saveAll()
+            keyMap.clear()
+        }
+    }
+
+
+    override fun removeAll(): List<V>? {
+        val values= keyMap.values.toList()
+        keyMap.clear()
+        return values
+    }
+
+
+    private fun recycle() {
+        if (keyMap.size<=0) return
+        val shouldRecycle = System.nanoTime() - lastFlushTime >= TimeUnit.MILLISECONDS.toNanos(flushInterval)
+        if (!shouldRecycle) return
+        keyMap.clear()
+    }
+
+
+}
+
+interface Cache<K,V> {
+    val size: Int
+
+    val toList:List<Pair<K,V>>
+
+    operator fun set(key: K, value: V?)
+
+    fun contains(key: K): Boolean
+
+    operator fun get(key: K): V?
+
+    fun remove(key: K): V?
+
+    fun removeAll(): List<V>?
+
+    fun clear()
+    fun saveAll()
+}
+
+
+/**
+ * Suppress warning Leaking This as we sure to make singletone instance of object in single-thread
+ * more info and
+ * @see <a href="https://stackoverflow.com/questions/3921616/leaking-this-in-constructor-warning">discussion</a>
+ */
+@Suppress("LeakingThis")
+abstract class LifeCycleCache<K,V>(size:Int, secondsToFlush:Long)
+    : EntityCache<K, V>(maxSize=size,flushInterval = secondsToFlush)
+    , LifecycleObserver
+{
+    init {
+        ProcessLifecycleOwner.get().lifecycle
+            .addObserver(this)
+    }
+
+    @OnLifecycleEvent(Lifecycle.Event.ON_PAUSE)
+    fun onAppPaused() {
+        saveAll()
+    }
+}

app/src/main/java/com/biganto/visual/roompark/data/repository/db/IDb.kt

@@ -32,7 +32,7 @@ interface IDb {
     fun getPhotos(albumId: Int): Observable<GalleryPhotoEntity>
     fun getPhoto(photoId: Int): Observable<GalleryPhotoEntity>
     fun getAlbum(albumId: Int): Observable<ImageAlbumEntity>
-    fun getUserFavorites(uuid: Int): Observable<EstateEntity>
+    fun getUserFavorites(uuid: Int): Observable<EstateEntity?>
     fun fetchAllUsers(): Observable<List<UserEntity>>
     fun getEstate(estateId: Int): Observable<EstateEntity>
     fun upsertEstate(entity: EstateEntity)
@@ -78,4 +78,6 @@ interface IDb {
     fun upsertEstates(entity: List<EstateEntity>): Observable<Iterable<EstateEntity>>?
     fun upsertDeals(entity: List<DealEntity>): Observable<Iterable<DealEntity>>
     fun deleteSubscriptions(entities: List<Subscription>)
+    fun deleteEstate(entity: List<EstateEntity>)
+    fun deleteEstate(entity: EstateEntity)
 }
\ No newline at end of file

app/src/main/java/com/biganto/visual/roompark/data/repository/db/requrey/RequeryRepository.kt

@@ -190,7 +190,7 @@ class RequeryRepository @Inject constructor(
                         .get()
                         .observableResult()
 
-        override fun getUserFavorites(uuid: Int): Observable<EstateEntity> =
+        override fun getUserFavorites(uuid: Int): Observable<EstateEntity?> =
                 store.select(EstateEntity::class)
                         .where(EstateEntity.USER_ID.eq(uuid))
                         .and(EstateEntity.FAVORITE.eq(true))
@@ -409,6 +409,10 @@ class RequeryRepository @Inject constructor(
                 .where(TourFileJunctionEntity.TOUR.eq(tourId))
                 .get()
 
+        override fun deleteEstate(entity:EstateEntity) = deleteBlocking(entity)
+
+        override fun deleteEstate(entity:List<EstateEntity>) = deleteBlocking(entity)
+
         override fun deleteFile(entity:FileEntity) = deleteBlocking(entity)
 
         override fun deleteFiles(entity:List<FileEntity>) = deleteBlocking(entity)

app/src/main/java/com/biganto/visual/roompark/domain/contract/DealContract.kt

 package com.biganto.visual.roompark.domain.contract
 
-import com.biganto.visual.roompark.data.repository.db.requrey.model.DealEntity
 import com.biganto.visual.roompark.data.repository.db.requrey.model.EstateEntity
 import com.biganto.visual.roompark.data.repository.db.requrey.model.UserEntity
 import com.biganto.visual.roompark.domain.model.DealModel
@@ -15,11 +14,12 @@ import io.reactivex.Observable
 
 interface DealContract{
 
-    fun getFavorites() : Observable<List<EstateModel>>
+//    fun getFavorites() : Observable<List<EstateModel>>
     fun getEstate(estateId: Int): Observable<EstateModel>
     fun getDeals(): Observable<List<DealModel>>
     fun fetchEstate(building: Int, number: Int): Observable<EstateModel>
     fun setDealRead(dealId: String): Completable
     fun fetchDeals(user: UserEntity): Observable<List<EstateEntity>>
-    fun fetchFavorites(user: UserEntity): Observable<Iterable<EstateEntity>>
+    fun fetchFavorites(user: UserEntity): Observable<List<EstateEntity>>
+    fun getFavorites(user: UserEntity): Observable<List<EstateModel>>
 }
\ No newline at end of file

app/src/main/java/com/biganto/visual/roompark/domain/use_case/estateUseCase.kt

 package com.biganto.visual.roompark.domain.use_case
 
+import com.biganto.visual.roompark.domain.contract.AuthContract
 import com.biganto.visual.roompark.domain.contract.DealContract
 import com.biganto.visual.roompark.domain.contract.FlatPlanContract
+import com.biganto.visual.roompark.domain.model.EstateModel
+import io.reactivex.Observable
 import javax.inject.Inject
 
 /**
@@ -10,10 +13,13 @@ import javax.inject.Inject
 
 class  EstateUseCase @Inject constructor(
     private val contract: DealContract,
-    private val planContract: FlatPlanContract
+    private val planContract: FlatPlanContract,
+    private val authContract: AuthContract
 ) {
 
-    fun fetchFavorites() = contract.getFavorites()
+    fun fetchFavorites(): Observable<List<EstateModel>> =
+        authContract.currentUser()
+            .flatMap (contract::getFavorites)
 
     fun getEstate(estateId: Int) = contract.getEstate(estateId)