Introduce a Lifecycle for system services
Provide an abstract class for system services to extend from,
similar to the android.app.Service.
This will allow services to receive events in a uniform way,
and will allow services to be created and started in the
correct order regardless of whether or not a particular
service exists.
Similar to android.app.Service, services are meant to implement
Binder interfaces as inner classes. This prevents services from
having incestuous access to each other and makes them use the
public API.
Change-Id: Iaacfee8d5f080a28d7cc606761f4624673ed390f
diff --git a/services/java/com/android/server/LocalServices.java b/services/java/com/android/server/LocalServices.java
new file mode 100644
index 0000000..deff79dc
--- /dev/null
+++ b/services/java/com/android/server/LocalServices.java
@@ -0,0 +1,58 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.server;
+
+import android.util.ArrayMap;
+
+/**
+ * This class is used in a similar way as ServiceManager, except the services registered here
+ * are not Binder objects and are only available in the same process.
+ *
+ * Once all services are converted to the SystemService interface, this class can be absorbed
+ * into SystemServiceManager.
+ */
+public final class LocalServices {
+ private LocalServices() {}
+
+ private static final ArrayMap<Class<?>, Object> sLocalServiceObjects =
+ new ArrayMap<Class<?>, Object>();
+
+ /**
+ * Returns a local service instance that implements the specified interface.
+ *
+ * @param type The type of service.
+ * @return The service object.
+ */
+ @SuppressWarnings("unchecked")
+ public static <T> T getService(Class<T> type) {
+ synchronized (sLocalServiceObjects) {
+ return (T) sLocalServiceObjects.get(type);
+ }
+ }
+
+ /**
+ * Adds a service instance of the specified interface to the global registry of local services.
+ */
+ public static <T> void addService(Class<T> type, T service) {
+ synchronized (sLocalServiceObjects) {
+ if (sLocalServiceObjects.containsKey(type)) {
+ throw new IllegalStateException("Overriding service registration");
+ }
+ sLocalServiceObjects.put(type, service);
+ }
+ }
+}