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      1 /*
      2  * Copyright (C) 2016 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package android.os;
     18 
     19 import android.annotation.SystemApi;
     20 
     21 /** @hide */
     22 @SystemApi
     23 public interface IHwBinder {
     24     /**
     25      * Process a hwbinder transaction.
     26      *
     27      * @param code interface specific code for interface.
     28      * @param request parceled transaction
     29      * @param reply object to parcel reply into
     30      * @param flags transaction flags to be chosen by wire protocol
     31      *
     32      * @hide
     33      */
     34     @SystemApi
     35     public void transact(
     36             int code, HwParcel request, HwParcel reply, int flags)
     37         throws RemoteException;
     38 
     39     /**
     40      * Return as IHwInterface instance only if this implements descriptor.
     41      *
     42      * @param descriptor for example foo.bar (at) 1.0::IBaz
     43      * @hide
     44      */
     45     @SystemApi
     46     public IHwInterface queryLocalInterface(String descriptor);
     47 
     48     /**
     49      * Interface for receiving a callback when the process hosting a service
     50      * has gone away.
     51      */
     52     @SystemApi
     53     public interface DeathRecipient {
     54         /**
     55          * Callback for a registered process dying.
     56          *
     57          * @param cookie cookie this death recipient was registered with.
     58          */
     59         @SystemApi
     60         public void serviceDied(long cookie);
     61     }
     62 
     63     /**
     64      * Notifies the death recipient with the cookie when the process containing
     65      * this binder dies.
     66      *
     67      * @param recipient callback object to be called on object death.
     68      * @param cookie value to be given to callback on object death.
     69      */
     70     @SystemApi
     71     public boolean linkToDeath(DeathRecipient recipient, long cookie);
     72     /**
     73      * Unregisters the death recipient from this binder.
     74      *
     75      * @param recipient callback to no longer recieve death notifications on this binder.
     76      */
     77     @SystemApi
     78     public boolean unlinkToDeath(DeathRecipient recipient);
     79 }
     80