Package com.bumptech.glide.load.engine

Class Engine

java.lang.Object

com.bumptech.glide.load.engine.Engine

All Implemented Interfaces:

MemoryCache.ResourceRemovedListener

public class Engine
extends Object
implements MemoryCache.ResourceRemovedListener

Responsible for starting loads and managing active and cached resources.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
class	Engine.LoadStatus	Allows a request to indicate it no longer is interested in a given load.

Constructor Summary

Constructors

Constructor	Description
Engine(MemoryCache memoryCache, DiskCache.Factory diskCacheFactory, GlideExecutor diskCacheExecutor, GlideExecutor sourceExecutor, GlideExecutor sourceUnlimitedExecutor, GlideExecutor animationExecutor, boolean isActiveResourceRetentionAllowed)

Method Summary

Modifier and Type	Method	Description
void	clearDiskCache()
<R> Engine.LoadStatus	load(GlideContext glideContext, Object model, Key signature, int width, int height, Class<?> resourceClass, Class<R> transcodeClass, Priority priority, DiskCacheStrategy diskCacheStrategy, Map<Class<?>,Transformation<?>> transformations, boolean isTransformationRequired, boolean isScaleOnlyOrNoTransform, Options options, boolean isMemoryCacheable, boolean useUnlimitedSourceExecutorPool, boolean useAnimationPool, boolean onlyRetrieveFromCache, ResourceCallback cb, Executor callbackExecutor)	Starts a load for the given arguments.
void	onEngineJobCancelled(com.bumptech.glide.load.engine.EngineJob<?> engineJob, Key key)
void	onEngineJobComplete(com.bumptech.glide.load.engine.EngineJob<?> engineJob, Key key, com.bumptech.glide.load.engine.EngineResource<?> resource)
void	onResourceReleased(Key cacheKey, com.bumptech.glide.load.engine.EngineResource<?> resource)
void	onResourceRemoved(Resource<?> resource)
void	release(Resource<?> resource)
void	shutdown()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

Engine

public Engine(MemoryCache memoryCache,
 DiskCache.Factory diskCacheFactory,
 GlideExecutor diskCacheExecutor,
 GlideExecutor sourceExecutor,
 GlideExecutor sourceUnlimitedExecutor,
 GlideExecutor animationExecutor,
 boolean isActiveResourceRetentionAllowed)

Method Details

load

public <R> Engine.LoadStatus load(GlideContext glideContext,
 Object model,
 Key signature,
 int width,
 int height,
 Class<?> resourceClass,
 Class<R> transcodeClass,
 Priority priority,
 DiskCacheStrategy diskCacheStrategy,
 Map<Class<?>,Transformation<?>> transformations,
 boolean isTransformationRequired,
 boolean isScaleOnlyOrNoTransform,
 Options options,
 boolean isMemoryCacheable,
 boolean useUnlimitedSourceExecutorPool,
 boolean useAnimationPool,
 boolean onlyRetrieveFromCache,
 ResourceCallback cb,
 Executor callbackExecutor)

Starts a load for the given arguments.

Must be called on the main thread.

The flow for any request is as follows:

• Check the current set of actively used resources, return the active resource if present, and move any newly inactive resources into the memory cache.
• Check the memory cache and provide the cached resource if present.
• Check the current set of in progress loads and add the cb to the in progress load if one is present.
• Start a new load.

Active resources are those that have been provided to at least one request and have not yet been released. Once all consumers of a resource have released that resource, the resource then goes to cache. If the resource is ever returned to a new consumer from cache, it is re-added to the active resources. If the resource is evicted from the cache, its resources are recycled and re-used if possible and the resource is discarded. There is no strict requirement that consumers release their resources so active resources are held weakly.

Parameters:

width - The target width in pixels of the desired resource.

height - The target height in pixels of the desired resource.

cb - The callback that will be called when the load completes.

release

public void release(Resource<?> resource)

onEngineJobComplete

public void onEngineJobComplete(com.bumptech.glide.load.engine.EngineJob<?> engineJob,
 Key key,
 com.bumptech.glide.load.engine.EngineResource<?> resource)

onEngineJobCancelled

public void onEngineJobCancelled(com.bumptech.glide.load.engine.EngineJob<?> engineJob,
 Key key)

onResourceRemoved

public void onResourceRemoved(@NonNull
 Resource<?> resource)

Specified by:

onResourceRemoved in interface MemoryCache.ResourceRemovedListener

onResourceReleased

public void onResourceReleased(Key cacheKey,
 com.bumptech.glide.load.engine.EngineResource<?> resource)

clearDiskCache

public void clearDiskCache()

shutdown

public void shutdown()