1 /* 2 * Copyright (C) 2015 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 com.android.messaging.datamodel.media; 17 18 import com.android.messaging.datamodel.binding.BindableOnceData; 19 import com.android.messaging.datamodel.media.MediaResourceManager.MediaResourceLoadListener; 20 21 /** 22 * The {@link MediaRequest} interface is threading-model-blind, allowing the implementations to 23 * be processed synchronously or asynchronously. 24 * This is a {@link MediaRequest} implementation that includes functionalities such as binding and 25 * event callbacks for multi-threaded media request processing. 26 */ 27 public abstract class BindableMediaRequest<T extends RefCountedMediaResource> 28 extends BindableOnceData 29 implements MediaRequest<T>, MediaResourceLoadListener<T> { 30 private MediaResourceLoadListener<T> mListener; 31 32 public BindableMediaRequest(final MediaResourceLoadListener<T> listener) { 33 mListener = listener; 34 } 35 36 /** 37 * Delegates the media resource callback to the listener. Performs binding check to ensure 38 * the listener is still bound to this request. 39 */ 40 @Override 41 public void onMediaResourceLoaded(final MediaRequest<T> request, final T resource, 42 final boolean cached) { 43 if (isBound() && mListener != null) { 44 mListener.onMediaResourceLoaded(request, resource, cached); 45 } 46 } 47 48 /** 49 * Delegates the media resource callback to the listener. Performs binding check to ensure 50 * the listener is still bound to this request. 51 */ 52 @Override 53 public void onMediaResourceLoadError(final MediaRequest<T> request, final Exception exception) { 54 if (isBound() && mListener != null) { 55 mListener.onMediaResourceLoadError(request, exception); 56 } 57 } 58 59 @Override 60 protected void unregisterListeners() { 61 mListener = null; 62 } 63 } 64
