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Commit aee41a9a authored by Hai Zhang's avatar Hai Zhang Committed by Chris Wailes
Browse files

Add LocalManagerRegistry inside system server. 

This is similar to LocalServices, but dedicated to module API in the
same process.

Bug: 158736025
Test: presubmit
Merged-In: Ib9f14070a665ebd8c582376d7ea044d9b945b6b0
Change-Id: Ib9f14070a665ebd8c582376d7ea044d9b945b6b0
parent b1cba34b

services/api/current.txt

+5 −0
Original line number Diff line number Diff line
@@ -46,6 +46,11 @@ package com.android.role.persistence { 


package com.android.server {



  public final class LocalManagerRegistry {

    method public static <T> void addManager(@NonNull Class<T>, @NonNull T);

    method @Nullable public static <T> T getManager(@NonNull Class<T>);

  }



  public abstract class SystemService {

    ctor public SystemService(@NonNull android.content.Context);

    method @NonNull public final android.content.Context getContext();

services/api/non-updatable-current.txt

+5 −0
Original line number Diff line number Diff line 
// Signature format: 2.0

package com.android.server {



  public final class LocalManagerRegistry {

    method public static <T> void addManager(@NonNull Class<T>, @NonNull T);

    method @Nullable public static <T> T getManager(@NonNull Class<T>);

  }



  public abstract class SystemService {

    ctor public SystemService(@NonNull android.content.Context);

    method @NonNull public final android.content.Context getContext();

services/core/java/com/android/server/LocalManagerRegistry.java

0 → 100644
+73 −0
Original line number Diff line number Diff line 
/*

 * Copyright (C) 2020 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.annotation.NonNull;

import android.annotation.Nullable;

import android.annotation.SystemApi;

import android.util.ArrayMap;



import java.util.Map;

import java.util.Objects;



/**

 * The registry for in-process module interfaces.

 * <p>

 * In-process module interfaces should be named with the suffix {@code ManagerLocal} for

 * consistency.

 *

 * @hide

 */

@SystemApi(client = SystemApi.Client.SYSTEM_SERVER)

public final class LocalManagerRegistry {

    private LocalManagerRegistry() {}



    @NonNull

    private static final Map<Class<?>, Object> sManagers = new ArrayMap<>();



    /**

     * Get a manager from the registry.

     *

     * @param managerClass the class that the manager implements

     * @return the manager, or {@code null} if not found

     */

    @Nullable

    @SuppressWarnings("unchecked")

    public static <T> T getManager(@NonNull Class<T> managerClass) {

        synchronized (sManagers) {

            return (T) sManagers.get(managerClass);

        }

    }



    /**

     * Adds a manager to the registry.

     *

     * @param managerClass the class that the manager implements

     * @param manager the manager

     * @throws IllegalStateException if the manager class is already registered

     */

    public static <T> void addManager(@NonNull Class<T> managerClass, @NonNull T manager) {

        Objects.requireNonNull(managerClass, "managerClass");

        Objects.requireNonNull(manager, "manager");

        synchronized (sManagers) {

            if (sManagers.containsKey(managerClass)) {

                throw new IllegalStateException(managerClass.getName() + " is already registered");

            }

            sManagers.put(managerClass, manager);

        }

    }

}