How to use

setResourceRemovedListener

method

in

com.bumptech.glide.load.engine.cache.MemoryCache

@Test
public void testEngineAddedAsListenerToMemoryCache() {
 harness.getEngine();
 verify(harness.cache).setResourceRemovedListener(eq(harness.getEngine()));
}

cache.setResourceRemovedListener(this);

@Test
public void testPreventEviction() {
 final MemoryCache cache = new LruResourceCache(100);
 final Resource<?> first = getResource(30);
 final Key firstKey = new MockKey();
 cache.put(firstKey, first);
 Resource<?> second = getResource(30);
 Key secondKey = new MockKey();
 cache.put(secondKey, second);
 Resource<?> third = getResource(30);
 Key thirdKey = new MockKey();
 cache.put(thirdKey, third);
 cache.setResourceRemovedListener(new ResourceRemovedListener() {
  @Override
  public void onResourceRemoved(@NonNull Resource<?> removed) {
   if (removed == first) {
    cache.put(firstKey, first);
   }
  }
 });
 // trims from 100 to 50, having 30+30+30 items, it should trim to 1 item
 cache.trimMemory(ComponentCallbacks2.TRIM_MEMORY_UI_HIDDEN);
 // and that 1 item must be first, because it's forced to return to cache in the listener
 @SuppressWarnings("unchecked")
 LruCache<Key, Resource<?>> lruCache = (LruCache<Key, Resource<?>>) cache;
 assertTrue(lruCache.contains(firstKey));
 assertFalse(lruCache.contains(secondKey));
 assertFalse(lruCache.contains(thirdKey));
}

Engine(MemoryCache cache, DiskCache.Factory diskCacheFactory, ExecutorService diskCacheService,
    ExecutorService sourceService, Map<Key, EngineJob> jobs, EngineKeyFactory keyFactory,
    Map<Key, WeakReference<EngineResource<?>>> activeResources, EngineJobFactory engineJobFactory,
    ResourceRecycler resourceRecycler) {
  this.cache = cache;
  this.diskCacheProvider = new LazyDiskCacheProvider(diskCacheFactory);
  if (activeResources == null) {
    activeResources = new HashMap<Key, WeakReference<EngineResource<?>>>();
  }
  this.activeResources = activeResources;
  if (keyFactory == null) {
    keyFactory = new EngineKeyFactory();
  }
  this.keyFactory = keyFactory;
  if (jobs == null) {
    jobs = new HashMap<Key, EngineJob>();
  }
  this.jobs = jobs;
  if (engineJobFactory == null) {
    engineJobFactory = new EngineJobFactory(diskCacheService, sourceService, this);
  }
  this.engineJobFactory = engineJobFactory;
  if (resourceRecycler == null) {
    resourceRecycler = new ResourceRecycler();
  }
  this.resourceRecycler = resourceRecycler;
  cache.setResourceRemovedListener(this);
}

cache.setResourceRemovedListener(this);