1 /* 2 * Copyright (C) 2018 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 package android.frameworks.bufferhub@1.0; 17 18 interface IBufferClient { 19 /** 20 * Creates a token that could be used for IBufferHub::import function later. 21 * 22 * @return token A per-boot-unique token in handle format. The content of 23 * token is opaque and implementation defined. Could be used for create 24 * another IBufferClient via IBufferHub::import function. 25 * @return status The result of this operation. NO_ERROR on success, 26 * error codes on failure. 27 */ 28 duplicate() generates (handle token, BufferHubStatus status); 29 30 /** 31 * Closes this client. 32 * 33 * All further function calls must return CLIENT_CLOSED. All the unused 34 * tokens generated by this client via IBufferClient::duplicate must become 35 * invalid, and try to use them for import will return INVALID_TOKEN. 36 * 37 * Calling close must immediately free the underlying buffers if they are 38 * only used by this client, but the client must also be freed after 39 * calling this method. 40 * 41 * User may manually call this function to avoid race condition caused by 42 * asynchronous destructors. 43 * 44 * @return status The result of this operation. NO_ERROR on success, 45 * error codes on failure. 46 */ 47 close() generates (BufferHubStatus status); 48 };
