Code review nitpicks.

briar-android/src/org/briarproject/android/controller/DbControllerImpl.java

@@ -0,0 +1,43 @@
+package org.briarproject.android.controller;
+
+import org.briarproject.api.db.DatabaseExecutor;
+import org.briarproject.api.lifecycle.LifecycleManager;
+
+import java.util.concurrent.Executor;
+import java.util.logging.Logger;
+
+import javax.inject.Inject;
+
+public class DbControllerImpl implements DbController {
+
+	private static final Logger LOG =
+			Logger.getLogger(DbControllerImpl.class.getName());
+
+	// Fields that are accessed from background threads must be volatile
+	@Inject
+	@DatabaseExecutor
+	protected volatile Executor dbExecutor;
+	@Inject
+	protected volatile LifecycleManager lifecycleManager;
+
+	@Inject
+	public DbControllerImpl() {
+
+	}
+
+	@Override
+	public void runOnDbThread(final Runnable task) {
+		dbExecutor.execute(new Runnable() {
+			@Override
+			public void run() {
+				try {
+					lifecycleManager.waitForDatabase();
+					task.run();
+				} catch (InterruptedException e) {
+					LOG.warning("Interrupted while waiting for database");
+					Thread.currentThread().interrupt();
+				}
+			}
+		});
+	}
+}