Class Engine

library/src/main/java/com/bumptech/glide/load/engine/Engine.java:29–603

Responsible for starting loads and managing active and cached resources.

/** Responsible for starting loads and managing active and cached resources. */
public class Engine
    implements EngineJobListener,
        MemoryCache.ResourceRemovedListener,
        EngineResource.ResourceListener {
  private static final String TAG = "Engine";
  private static final int JOB_POOL_SIZE = 150;
  private static final boolean VERBOSE_IS_LOGGABLE = Log.isLoggable(TAG, Log.VERBOSE);
  private final Jobs jobs;
  private final EngineKeyFactory keyFactory;
  private final MemoryCache cache;
  private final EngineJobFactory engineJobFactory;
  private final ResourceRecycler resourceRecycler;
  private final LazyDiskCacheProvider diskCacheProvider;
  private final DecodeJobFactory decodeJobFactory;
  private final ActiveResources activeResources;

  public Engine(
      MemoryCache memoryCache,
      DiskCache.Factory diskCacheFactory,
      GlideExecutor diskCacheExecutor,
      GlideExecutor sourceExecutor,
      GlideExecutor sourceUnlimitedExecutor,
      GlideExecutor animationExecutor,
      boolean isActiveResourceRetentionAllowed) {
    this(
        memoryCache,
        diskCacheFactory,
        diskCacheExecutor,
        sourceExecutor,
        sourceUnlimitedExecutor,
        animationExecutor,
        /* jobs= */ null,
        /* keyFactory= */ null,
        /* activeResources= */ null,
        /* engineJobFactory= */ null,
        /* decodeJobFactory= */ null,
        /* resourceRecycler= */ null,
        isActiveResourceRetentionAllowed);
  }

  @VisibleForTesting
  Engine(
      MemoryCache cache,
      DiskCache.Factory diskCacheFactory,
      GlideExecutor diskCacheExecutor,
      GlideExecutor sourceExecutor,
      GlideExecutor sourceUnlimitedExecutor,
      GlideExecutor animationExecutor,
      Jobs jobs,
      EngineKeyFactory keyFactory,
      ActiveResources activeResources,
      EngineJobFactory engineJobFactory,
      DecodeJobFactory decodeJobFactory,
      ResourceRecycler resourceRecycler,
      boolean isActiveResourceRetentionAllowed) {
    this.cache = cache;
    this.diskCacheProvider = new LazyDiskCacheProvider(diskCacheFactory);