[android] Add OfflineManager.runPackDatabaseAutomatically(boolean) API

platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/offline/OfflineManager.java

@@ -309,6 +309,9 @@ public class OfflineManager {
   /**
    * Packs the existing database file into a minimal amount of disk space.
    * <p>
+   * This operation has a performance impact as it will vacuum the database,
+   * forcing it to move pages on the filesystem.
+   * <p>
    * When the operation is complete or encounters an error, the given callback will be
    * executed on the database thread; it is the responsibility of the SDK bindings
    * to re-execute a user-provided callback on the main thread.
@@ -396,9 +399,10 @@ public class OfflineManager {
   /**
    * Erase resources from the ambient cache, freeing storage space.
    * <p>
-   * Erases the ambient cache, freeing resources. This operation can be
-   * potentially slow because it will trigger a VACUUM on SQLite,
-   * forcing the database to move pages on the filesystem.
+   * Erases the ambient cache, freeing resources.
+   * <p>
+   * Note that this operation can be potentially slow if packing the database
+   * occurs automatically ({@link OfflineManager#runPackDatabaseAutomatically(boolean)}).
    * </p>
    * <p>
    * Resources overlapping with offline regions will not be affected
@@ -661,7 +665,7 @@ public class OfflineManager {
    * <p>
    * Once this limit is reached, {@link OfflineRegion.OfflineRegionObserver#mapboxTileCountLimitExceeded(long)}
    * fires every additional attempt to download additional tiles until already downloaded tiles are removed
-   * by calling {@link OfflineRegion#deleteOfflineRegion(OfflineRegion.OfflineRegionDeleteCallback)}.
+   * by calling {@link OfflineRegion#delete(OfflineRegion.OfflineRegionDeleteCallback)}.
    * </p>
    *
    * @param limit the maximum number of tiles allowed to be downloaded
@@ -669,6 +673,24 @@ public class OfflineManager {
   @Keep
   public native void setOfflineMapboxTileCountLimit(long limit);
 
+  /**
+   * Sets whether database file packing occurs automatically.
+   * By default, the automatic database file packing is enabled.
+   * <p>
+   * If packing is enabled, database file packing occurs automatically
+   * after an offline region is deleted by calling
+   * {@link OfflineRegion#delete(OfflineRegion.OfflineRegionDeleteCallback)}
+   * or the ambient cache is cleared by calling {@link OfflineManager#clearAmbientCache()}.
+   *
+   * If packing is disabled, disk space will not be freed after
+   * resources are removed unless {@link OfflineManager#packDatabase()} is explicitly called.
+   * </p>
+   *
+   * @param autopack flag setting the automatic database file packing.
+   */
+  @Keep
+  public native void runPackDatabaseAutomatically(boolean autopack);
+
   @Keep
   private native void initialize(FileSource fileSource);
 

platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/offline/OfflineRegion.java

@@ -388,6 +388,10 @@ public class OfflineRegion {
    * by other regions, until the database shrinks below a certain size.
    * </p>
    * <p>
+   * Note that this operation can be potentially slow if packing the database
+   * occurs automatically ({@link OfflineManager#runPackDatabaseAutomatically(boolean)}).
+   * </p>
+   * <p>
    * When the operation is complete or encounters an error, the given callback will be
    * executed on the main thread.
    * </p>

platform/android/src/offline/offline_manager.cpp

@@ -168,6 +168,10 @@ void OfflineManager::setMaximumAmbientCacheSize(jni::JNIEnv& env_, const jni::jl
             std::exception_ptr exception) mutable { handleException(exception, *callback); });
 }
 
+void OfflineManager::runPackDatabaseAutomatically(jni::JNIEnv&, jboolean autopack) {
+    fileSource->runPackDatabaseAutomatically(autopack);
+}
+
 // FileSource::FileSourceCallback //
 
 void OfflineManager::FileSourceCallback::onSuccess(jni::JNIEnv& env,
@@ -211,6 +215,7 @@ void OfflineManager::registerNative(jni::JNIEnv& env) {
         METHOD(&OfflineManager::invalidateAmbientCache, "nativeInvalidateAmbientCache"),
         METHOD(&OfflineManager::clearAmbientCache, "nativeClearAmbientCache"),
         METHOD(&OfflineManager::setMaximumAmbientCacheSize, "nativeSetMaximumAmbientCacheSize"),
+        METHOD(&OfflineManager::runPackDatabaseAutomatically, "runPackDatabaseAutomatically"),
         METHOD(&OfflineManager::putResourceWithUrl, "putResourceWithUrl"));
 }
 

platform/android/src/offline/offline_manager.hpp

@@ -103,6 +103,8 @@ public:
 
     void setMaximumAmbientCacheSize(jni::JNIEnv&, const jni::jlong size, const jni::Object<FileSourceCallback>& callback_);
 
+    void runPackDatabaseAutomatically(jni::JNIEnv&, jboolean autopack);
+
 private:
     std::shared_ptr<mbgl::DefaultFileSource> fileSource;
 };