1 /* 2 * Copyright (C) 2014 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 com.android.camera.one.v2.sharedimagereader.ticketpool; 18 19 import javax.annotation.CheckReturnValue; 20 import javax.annotation.Nullable; 21 22 public interface TicketProvider { 23 /** 24 * Attempts to acquire and return a ticket. 25 * 26 * @return The acquired ticket, or null if no ticket is readily available. 27 */ 28 @Nullable 29 @CheckReturnValue 30 public Ticket tryAcquire(); 31 } 32
