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/*
* Copyright (C) 2015 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.messaging.datamodel.media;
import java.util.List;
/**
* Keeps track of a media loading request. MediaResourceManager uses this interface to load, encode,
* decode, and cache different types of media resource.
*
* This interface defines a media request class that's threading-model-blind. Wrapper classes
* (such as {@link AsyncMediaRequestWrapper} wraps around any base media request to offer async
* extensions).
*/
public interface MediaRequest<T extends RefCountedMediaResource> {
public static final int REQUEST_ENCODE_MEDIA = 1;
public static final int REQUEST_DECODE_MEDIA = 2;
public static final int REQUEST_LOAD_MEDIA = 3;
/**
* Returns a unique key used for storing and looking up the MediaRequest.
*/
String getKey();
/**
* This method performs the heavy-lifting work of synchronously loading the media bytes for
* this MediaRequest on a single threaded executor.
* @param chainedTask subsequent tasks to be performed after this request is complete. For
* example, an image request may need to compress the image resource before putting it in the
* cache
*/
T loadMediaBlocking(List<MediaRequest<T>> chainedTask) throws Exception;
/**
* Returns the media cache where this MediaRequest wants to store the loaded
* media resource.
*/
MediaCache<T> getMediaCache();
/**
* Returns the id of the cache where this MediaRequest wants to store the loaded
* media resource.
*/
int getCacheId();
/**
* Returns the request type of this media request, i.e. one of {@link #REQUEST_ENCODE_MEDIA},
* {@link #REQUEST_DECODE_MEDIA}, or {@link #REQUEST_LOAD_MEDIA}. The default is
* {@link #REQUEST_LOAD_MEDIA}
*/
int getRequestType();
/**
* Returns the descriptor defining the request.
*/
MediaRequestDescriptor<T> getDescriptor();
}
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