Maintain global list of caches; purge on low memory am: 8c239da8d5 am: 74be2dd90c (7ad9f282) · Commits · e / os / android_frameworks_base

core/java/android/app/ActivityThread.java

+6 −0

Original line number	Diff line number	Diff line
		@@ -6224,6 +6224,12 @@ public final class ActivityThread extends ClientTransactionHandler {
		Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, "trimMemory");
		if (DEBUG_MEMORY_TRIM) Slog.v(TAG, "Trimming memory to level: " + level);

		if (level >= ComponentCallbacks2.TRIM_MEMORY_COMPLETE) {
		for (PropertyInvalidatedCache pic : PropertyInvalidatedCache.getActiveCaches()) {
		pic.clear();
		}
		}

		ArrayList<ComponentCallbacks2> callbacks = collectComponentCallbacks(true, null);

		final int N = callbacks.size();

core/java/android/app/PropertyInvalidatedCache.java

+25 −0

Original line number	Diff line number	Diff line
		@@ -27,11 +27,13 @@ import android.util.Log;
		import com.android.internal.annotations.GuardedBy;
		import com.android.internal.annotations.VisibleForTesting;

		import java.util.ArrayList;
		import java.util.HashMap;
		import java.util.LinkedHashMap;
		import java.util.Map;
		import java.util.Objects;
		import java.util.Random;
		import java.util.WeakHashMap;
		import java.util.concurrent.atomic.AtomicLong;

		/**
		@@ -197,6 +199,14 @@ public abstract class PropertyInvalidatedCache<Query, Result> {
		@GuardedBy("sCorkLock")
		private static final HashMap<String, Integer> sCorks = new HashMap<>();

		/**
		* Weakly references all cache objects in the current process, allowing us to iterate over
		* them all for purposes like issuing debug dumps and reacting to memory pressure.
		*/
		@GuardedBy("sCorkLock")
		private static final WeakHashMap<PropertyInvalidatedCache, Void> sCaches =
		new WeakHashMap<>();

		private final Object mLock = new Object();

		/**
		@@ -241,6 +251,9 @@ public abstract class PropertyInvalidatedCache<Query, Result> {
		return size() > maxEntries;
		}
		};
		synchronized (sCorkLock) {
		sCaches.put(this, null);
		}
		}

		/**
		@@ -248,6 +261,9 @@ public abstract class PropertyInvalidatedCache<Query, Result> {
		*/
		public final void clear() {
		synchronized (mLock) {
		if (DEBUG) {
		Log.d(TAG, "clearing cache for " + mPropertyName);
		}
		mCache.clear();
		}
		}
		@@ -710,4 +726,13 @@ public abstract class PropertyInvalidatedCache<Query, Result> {
		Log.d(TAG, "disabling all caches in the process");
		sEnabled = false;
		}

		/**
		* Return a list of caches alive at the current time.
		*/
		public static ArrayList<PropertyInvalidatedCache> getActiveCaches() {
		synchronized (sCorkLock) {
		return new ArrayList<PropertyInvalidatedCache>(sCaches.keySet());
		}
		}
		}