Initial setup for cleanup with JobService

Signed-off-by: Arka Prava Basu <arkaprava94@gmail.com>

build.gradle

@@ -168,4 +168,8 @@ dependencies {
     androidTestImplementation "com.android.support.test.espresso:espresso-core:3.0.2"
     androidTestImplementation "com.android.support.test.espresso:espresso-intents:3.0.2"
     androidTestImplementation "android.arch.persistence.room:testing:1.1.1"
+
+    // firebase job dispatcher
+    implementation 'com.firebase:firebase-jobdispatcher:0.8.3'
+    implementation 'com.google.android.gms:play-services-base:16.0.1'
 }

src/main/AndroidManifest.xml

@@ -82,6 +82,9 @@
             android:name=".service.MonitorService"
             android:exported="false" />
 
+        <service android:name=".service.RemoveDeletedFilesService"
+            android:exported="false" />
+
         <meta-data
             android:name="DATABASE"
             android:value="haven.db" />

src/main/java/org/havenapp/main/ListActivity.java

@@ -49,6 +49,14 @@
 import android.view.MenuItem;
 import android.view.View;
 
+import com.firebase.jobdispatcher.Constraint;
+import com.firebase.jobdispatcher.FirebaseJobDispatcher;
+import com.firebase.jobdispatcher.GooglePlayDriver;
+import com.firebase.jobdispatcher.Job;
+import com.firebase.jobdispatcher.Lifetime;
+import com.firebase.jobdispatcher.RetryStrategy;
+import com.firebase.jobdispatcher.Trigger;
+import com.google.android.gms.common.GoogleApiAvailability;
 import com.mikepenz.aboutlibraries.Libs;
 import com.mikepenz.aboutlibraries.LibsBuilder;
 
@@ -60,6 +68,7 @@
 import org.havenapp.main.model.Event;
 import org.havenapp.main.resources.IResourceManager;
 import org.havenapp.main.resources.ResourceManager;
+import org.havenapp.main.service.RemoveDeletedFilesService;
 import org.havenapp.main.service.SignalSender;
 import org.havenapp.main.ui.EventActivity;
 import org.havenapp.main.ui.EventAdapter;
@@ -74,6 +83,7 @@
 import static org.havenapp.main.database.DbConstantsKt.DB_INIT_END;
 import static org.havenapp.main.database.DbConstantsKt.DB_INIT_START;
 import static org.havenapp.main.database.DbConstantsKt.DB_INIT_STATUS;
+import static org.havenapp.main.service.RemoveDeletedFilesServiceKt.SERVICE_TAG;
 
 public class ListActivity extends AppCompatActivity {
 
@@ -198,6 +208,8 @@ public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {
         initializeRecyclerViewComponents();
 
         fetchEventList();
+
+        scheduleCleanupJob(this);
     }
 
     private void initializeRecyclerViewComponents() {
@@ -234,6 +246,29 @@ private void fetchEventList() {
         }
     }
 
+    private static void scheduleCleanupJob(Context context) {
+        if (GoogleApiAvailability.getInstance().isGooglePlayServicesAvailable(context) == 0) {
+            return;
+        }
+
+        FirebaseJobDispatcher dispatcher = new
+                FirebaseJobDispatcher(new GooglePlayDriver(context));
+        dispatcher.mustSchedule(createJob(dispatcher));
+    }
+
+    private static Job createJob(FirebaseJobDispatcher dispatcher) {
+        return dispatcher.newJobBuilder()
+                .setLifetime(Lifetime.FOREVER)
+                .setService(RemoveDeletedFilesService.class)
+                .setTag(SERVICE_TAG)
+                .setReplaceCurrent(true)
+                .setRecurring(true)
+                .setTrigger(Trigger.executionWindow(0, 24 * 60 * 60))
+                .setRetryStrategy(RetryStrategy.DEFAULT_LINEAR)
+                .setConstraints(Constraint.ON_ANY_NETWORK, Constraint.DEVICE_CHARGING)
+                .build();
+    }
+
     private void showEmptyState() {
         recyclerView.setVisibility(View.GONE);
         findViewById(R.id.empty_view).setVisibility(View.VISIBLE);

src/main/java/org/havenapp/main/service/RemoveDeletedFilesService.kt

@@ -0,0 +1,64 @@
+package org.havenapp.main.service
+
+import android.util.Log
+import com.firebase.jobdispatcher.JobParameters
+import com.firebase.jobdispatcher.JobService
+import org.havenapp.main.PreferenceManager
+import org.havenapp.main.database.HavenEventDB
+import org.havenapp.main.model.EventTrigger
+import java.io.File
+
+/**
+ * A [JobService] to delete files related to deleted logs.
+ * <p>
+ * Created by Arka Prava Basu <arka.basu@zomato.com> on 28/10/18.
+ */
+
+const val SERVICE_TAG = "HavenCleanupService"
+
+class RemoveDeletedFilesService: JobService() {
+    override fun onStopJob(job: JobParameters?): Boolean {
+        Log.d(SERVICE_TAG, "Cleanup Service interrupted")
+        return false
+    }
+
+    override fun onStartJob(job: JobParameters): Boolean {
+        Log.d(SERVICE_TAG, "Starting Cleanup Service")
+        Thread {
+            // remove all deleted logs from disk and reschedule this task
+            removeDeletedLogsFromDisk()
+            jobFinished(job, true)
+            Log.d(SERVICE_TAG, "Stopping Cleanup service")
+        }
+
+        return true
+    }
+
+    private fun removeDeletedLogsFromDisk() {
+        val database = HavenEventDB.getDatabase(this)
+
+        val eventList = database.getEventDAO().getAllEvent()
+        val eventTriggerList = database.getEventTriggerDAO().getAllEventTriggers()
+
+        // keep a list of all invalid event triggers
+        val inValidEventTriggerList = mutableListOf<EventTrigger>()
+        eventTriggerList.filter { it.mEventId !in eventList.map { it.id } }.mapTo(inValidEventTriggerList) { it }
+
+        val currentFileList = mutableListOf<File>()
+        val storageDir = File(PreferenceManager(this).defaultMediaStoragePath)
+        currentFileList.addAll(storageDir.listFiles())
+
+        val targetFileList = mutableListOf<File>()
+        currentFileList.filter { it.absolutePath in inValidEventTriggerList.map { it.mPath } }.mapTo(targetFileList) { it }
+
+        // delete these files from disk
+        for (file in targetFileList) {
+            file.delete()
+        }
+
+        // remove entry of all invalid event triggers from database
+        for (inValidEventTrigger in inValidEventTriggerList) {
+            database.getEventTriggerDAO().delete(inValidEventTrigger)
+        }
+    }
+}