Better concurrency support

.travis.yml

@@ -1,40 +1,28 @@
-language: java
-jdk: oraclejdk7
 env: ANDROID_SDK=android-16 ANDROID_ABI=armeabi-v7a
+language: android
+android:
+  components:
+    # The SDK version used to compile your project
+    - $ANDROID_SDK
 
-before_install:
-  # Install ia32-libs (necessary for Android SDK to run on 64-bit linux)
-  # - sudo apt-get clean && sudo apt-get update
-  - sudo apt-get update -qq
-  - sudo apt-get install -qq --force-yes libgd2-xpm ia32-libs ia32-libs-multiarch
+    # Additional components
+    - extra-google-m2repository
+    - extra-android-m2repository
+    - extra-android-support
 
-  # Install Android SDK
-  - wget http://dl.google.com/android/android-sdk_r22.6.2-linux.tgz
-  - tar -zxf android-sdk_r22.6.2-linux.tgz
-  - ls
-  - export ANDROID_HOME=`pwd`/android-sdk-linux
-  - export PATH=${PATH}:${ANDROID_HOME}/tools:${ANDROID_HOME}/platform-tools
+    # Specify at least one system image,
+    # if you need to run emulator(s) during your tests
+    - sys-img-$ANDROID_ABI-$ANDROID_SDK
 
-  # Install build-tools
-  - wget https://dl-ssl.google.com/android/repository/build-tools_r19.0.3-linux.zip
-  - unzip build-tools_r19.0.3-linux.zip -d $ANDROID_HOME
-  - mkdir -p $ANDROID_HOME/build-tools/
-  - mv $ANDROID_HOME/android-4.4.2 $ANDROID_HOME/build-tools/19.0.1
+  licenses:
+    - 'android-sdk-license-.+'
 
-  # Install required Android components
-  - android list sdk --extended
-  # Do you accept the license 'android-sdk-license-bcbbd656' [y/n]:
-  - echo -ne "y\n" | android update sdk --filter system-image,platform-tools,extra-android-support,$ANDROID_SDK --no-ui --force
-
-  # Create and start emulator
+before_script:
   - echo no | android create avd --force -n test -t $ANDROID_SDK --abi $ANDROID_ABI
   - android list avds
   - emulator -avd test -no-skin -no-audio -no-window &
+  - android-wait-for-emulator
+  - adb shell input keyevent 82 &
+  - mvn --version
 
-before_script:
-  # Make sure the emulator has started before running tests
-  - chmod +x ./wait_for_emulator
-  - ./wait_for_emulator
-
-script:
-  - mvn clean install -e
+script: mvn clean install

android-wait-for-emulator

@@ -0,0 +1,25 @@
+#!/bin/bash
+
+# Originally written by Ralf Kistner <[email protected]>, but placed in the public domain
+
+set +e
+
+bootanim=""
+failcounter=0
+timeout_in_sec=360
+
+until [[ "$bootanim" =~ "stopped" ]]; do
+  bootanim=`adb -e shell getprop init.svc.bootanim 2>&1 &`
+  if [[ "$bootanim" =~ "device not found" || "$bootanim" =~ "device offline"
+    || "$bootanim" =~ "running" ]]; then
+    let "failcounter += 1"
+    echo "Waiting for emulator to start"
+    if [[ $failcounter -gt timeout_in_sec ]]; then
+      echo "Timeout ($timeout_in_sec seconds) reached; failed to start emulator"
+      exit 1
+    fi
+  fi
+  sleep 1
+done
+
+echo "Emulator is ready"

src/com/activeandroid/ActiveAndroid.java

@@ -20,6 +20,7 @@
 import android.database.sqlite.SQLiteDatabase;
 
 import com.activeandroid.util.Log;
+import android.os.Build;
 
 public final class ActiveAndroid {
 	//////////////////////////////////////////////////////////////////////////////////////
@@ -60,8 +61,16 @@ public static SQLiteDatabase getDatabase() {
 		return Cache.openDatabase();
 	}
 
+    /**
+     * Non-exclusive transactions allows BEGIN IMMEDIATE
+     * blocks, allowing better read concurrency.
+     */
 	public static void beginTransaction() {
-		Cache.openDatabase().beginTransaction();
+        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.HONEYCOMB) {
+            Cache.openDatabase().beginTransaction();
+        } else {
+            Cache.openDatabase().beginTransactionNonExclusive();
+        }
 	}
 
 	public static void endTransaction() {

src/com/activeandroid/DatabaseHelper.java

@@ -37,6 +37,7 @@
 import com.activeandroid.util.NaturalOrderComparator;
 import com.activeandroid.util.SQLiteUtils;
 import com.activeandroid.util.SqlParser;
+import android.os.Build;
 
 public final class DatabaseHelper extends SQLiteOpenHelper {
 	//////////////////////////////////////////////////////////////////////////////////////
@@ -65,6 +66,25 @@ public DatabaseHelper(Configuration configuration) {
 	// OVERRIDEN METHODS
 	//////////////////////////////////////////////////////////////////////////////////////
 
+    /**
+     * onConfigure is called when the db connection
+     * is being configured. It's the right place
+     * to enable write-ahead logging or foreign
+     * key support.
+     *
+     * Available for API level 16 (JellyBean) and above.
+     */
+    @Override
+    public void onConfigure(SQLiteDatabase db) {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
+            db.enableWriteAheadLogging();
+        }
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
+            db.setForeignKeyConstraintsEnabled(true);
+        }
+        executePragmas(db);
+    }
+
 	@Override
 	public void onOpen(SQLiteDatabase db) {
 		executePragmas(db);