- Add Room RxJava dependency to be able to use RxJava in Room db queries.

- Use RxJava's Single to make a Room query in TransfersLoader.

app/build.gradle

@@ -45,6 +45,8 @@ dependencies {
 
     implementation "androidx.room:room-runtime:$room_version"
     kapt "androidx.room:room-compiler:$room_version"
+    implementation "androidx.room:room-rxjava2:$room_version" // RxJava support for Room
+
 
     implementation 'org.bitcoinj:bitcoinj-core:0.14.3'
     implementation 'com.moldedbits.r2d2:r2d2:1.0.1'

app/src/main/java/cy/agorise/bitsybitshareswallet/activities/MainActivity.kt

@@ -6,13 +6,16 @@ import android.view.Menu
 import android.view.MenuItem
 import android.widget.Toast
 import com.google.android.material.bottomnavigation.BottomNavigationView
-import androidx.appcompat.app.AppCompatActivity
 import cy.agorise.bitsybitshareswallet.R
 import cy.agorise.bitsybitshareswallet.fragments.BalancesFragment
 import cy.agorise.bitsybitshareswallet.fragments.MerchantsFragment
+import cy.agorise.bitsybitshareswallet.processors.TransfersLoader
+import cy.agorise.graphenej.api.ApiAccess
+import cy.agorise.graphenej.api.ConnectionStatusUpdate
+import cy.agorise.graphenej.models.JsonRpcResponse
 import kotlinx.android.synthetic.main.activity_main.*
 
-class MainActivity : AppCompatActivity() {
+class MainActivity : ConnectedActivity() {
 
     private val mOnNavigationItemSelectedListener = BottomNavigationView.OnNavigationItemSelectedListener { item ->
         when (item.itemId) {
@@ -72,4 +75,35 @@ class MainActivity : AppCompatActivity() {
             super.onOptionsItemSelected(item)
         }
     }
+
+    override fun handleJsonRpcResponse(response: JsonRpcResponse<*>) {
+
+    }
+
+    /**
+     * Private method called whenever there's an update to the connection status
+     * @param connectionStatusUpdate  Connection status update.
+     */
+    override fun handleConnectionStatusUpdate(connectionStatusUpdate: ConnectionStatusUpdate) {
+        when (connectionStatusUpdate.updateCode) {
+            ConnectionStatusUpdate.CONNECTED -> {
+                // Instantiating this loader is enough to kick-start the transfers loading procedure
+                TransfersLoader(this, lifecycle)
+            }
+            ConnectionStatusUpdate.DISCONNECTED -> {
+                // Do nothing for now
+            }
+            ConnectionStatusUpdate.AUTHENTICATED -> {}//updateBalances() }
+            ConnectionStatusUpdate.API_UPDATE -> {
+                // In certain cases the information about the accounts is not complete, this may not be the best
+                // solution but at least it works. Feel free to improve it or move it to a better place
+                //MissingAccountsLoader(this, lifecycle)
+
+                if (connectionStatusUpdate.api == ApiAccess.API_DATABASE) {
+                    // Updating transfer and exchange costs in all possible input assets
+                    //updateCosts()
+                }
+            }
+        }
+    }
 }

app/src/main/java/cy/agorise/bitsybitshareswallet/daos/TransferDao.kt

@@ -6,6 +6,7 @@ import androidx.room.Insert
 import androidx.room.OnConflictStrategy
 import androidx.room.Query
 import cy.agorise.bitsybitshareswallet.entities.Transfer
+import io.reactivex.Single
 
 @Dao
 interface TransferDao {
@@ -17,7 +18,7 @@ interface TransferDao {
     fun insertAll(transfers: List<Transfer>)
 
     @Query("SELECT COUNT(*) FROM transfers")
-    fun getCount(): Int
+    fun getCount(): Single<Int>
 
     @Query("SELECT * FROM transfers")
     fun getAllTransfers(): LiveData<List<Transfer>>

app/src/main/java/cy/agorise/bitsybitshareswallet/entities/EquivalentValue.kt

@@ -8,7 +8,7 @@ import androidx.room.PrimaryKey
 @Entity(tableName = "equivalent_values",foreignKeys =
     [ForeignKey(
         entity = Transfer::class,
-        parentColumns = ["operation_id"],
+        parentColumns = ["id"],
         childColumns = ["transfer_id"]
     ), ForeignKey(
         entity = Asset::class,

app/src/main/java/cy/agorise/bitsybitshareswallet/processors/TransfersLoader.kt

@@ -27,6 +27,7 @@ import cy.agorise.graphenej.operations.TransferOperation
 import io.reactivex.android.schedulers.AndroidSchedulers
 import io.reactivex.disposables.Disposable
 import io.reactivex.functions.Consumer
+import io.reactivex.schedulers.Schedulers
 import org.bitcoinj.core.DumpedPrivateKey
 import org.bitcoinj.core.ECKey
 import java.util.*
@@ -218,14 +219,18 @@ class TransfersLoader(private var mContext: Context?, private val mLifeCycle: Li
             // If we are in debug mode, we first erase all entries in the 'transfer' table
             transferRepository!!.deleteAll()
         }
-        val transferCount = transferRepository!!.getCount()
-        if (transferCount > 0) {
-            // If we already have some transfers in the database, we might want to skip the request
-            // straight to the last batch
-            historicalTransferCount = Math.floor((transferCount / HISTORICAL_TRANSFER_BATCH_SIZE).toDouble()).toInt()
-        }
-        // Retrieving account transactions
-        loadNextOperationsBatch()
+        val disposable = transferRepository!!.getCount()
+            .subscribeOn(Schedulers.computation())
+            .observeOn(AndroidSchedulers.mainThread())
+            .subscribe { transferCount ->
+                 if (transferCount > 0) {
+                    // If we already have some transfers in the database, we might want to skip the request
+                    // straight to the last batch
+                    historicalTransferCount = Math.floor((transferCount / HISTORICAL_TRANSFER_BATCH_SIZE).toDouble()).toInt()
+                }
+                // Retrieving account transactions
+                loadNextOperationsBatch()
+            }
     }
 
     /**
@@ -241,7 +246,7 @@ class TransfersLoader(private var mContext: Context?, private val mLifeCycle: Li
 
         val insertedCount = transferRepository!!.insertAll(processOperationList(operationHistoryList))
 //        Log.d(TAG, String.format("Inserted count: %d, list size: %d", insertedCount, operationHistoryList.size))
-        if (operationHistoryList.isEmpty()) {
+        if (/* insertedCount == 0 && */ operationHistoryList.isEmpty()) {
             // We finally reached the end of the transactions, so now we must check for missing
             // transfer times
 //            mState = State.LOADING_MISSING_TIMES

app/src/main/java/cy/agorise/bitsybitshareswallet/repositories/TransferRepository.kt

@@ -5,6 +5,7 @@ import android.os.AsyncTask
 import cy.agorise.bitsybitshareswallet.daos.BitsyDatabase
 import cy.agorise.bitsybitshareswallet.daos.TransferDao
 import cy.agorise.bitsybitshareswallet.entities.Transfer
+import io.reactivex.Single
 
 class TransferRepository internal constructor(context: Context) {
 
@@ -19,7 +20,7 @@ class TransferRepository internal constructor(context: Context) {
         insertAllAsyncTask(mTransferDao).execute(transfers)
     }
 
-    fun getCount(): Int {
+    fun getCount(): Single<Int> {
         return mTransferDao.getCount()
     }