Merge "Add performance counters to cacheinfo dumps." into rvc-dev am:... (cf0702af) · Commits · e / os / android_frameworks_base

core/java/android/app/PropertyInvalidatedCache.java

+25 −0

Original line number	Diff line number	Diff line
		@@ -188,6 +188,17 @@ public abstract class PropertyInvalidatedCache<Query, Result> {
		private static final boolean DEBUG = false;
		private static final boolean VERIFY = false;

		// Per-Cache performance counters. As some cache instances are declared static,
		@GuardedBy("mLock")
		private long mHits = 0;

		@GuardedBy("mLock")
		private long mMisses = 0;

		// Most invalidation is done in a static context, so the counters need to be accessible.
		@GuardedBy("sCorkLock")
		private static final HashMap<String, Long> sInvalidates = new HashMap<>();

		/**
		* If sEnabled is false then all cache operations are stubbed out. Set
		* it to false inside test processes.
		@@ -265,6 +276,7 @@ public abstract class PropertyInvalidatedCache<Query, Result> {
		};
		synchronized (sCorkLock) {
		sCaches.put(this, null);
		sInvalidates.put(propertyName, (long) 0);
		}
		}

		@@ -365,6 +377,8 @@ public abstract class PropertyInvalidatedCache<Query, Result> {
		synchronized (mLock) {
		if (currentNonce == mLastSeenNonce) {
		cachedResult = mCache.get(query);

		if (cachedResult != null) mHits++;
		} else {
		if (DEBUG) {
		Log.d(TAG,
		@@ -428,6 +442,7 @@ public abstract class PropertyInvalidatedCache<Query, Result> {
		if (mLastSeenNonce == currentNonce && result != null) {
		mCache.put(query, result);
		}
		mMisses++;
		}
		return maybeCheckConsistency(query, result);
		}
		@@ -531,6 +546,8 @@ public abstract class PropertyInvalidatedCache<Query, Result> {
		newValueString));
		}
		SystemProperties.set(name, newValueString);
		long invalidateCount = sInvalidates.getOrDefault(name, (long) 0);
		sInvalidates.put(name, ++invalidateCount);
		}

		/**
		@@ -758,8 +775,16 @@ public abstract class PropertyInvalidatedCache<Query, Result> {
		}

		private void dumpContents(PrintWriter pw, String[] args) {
		long invalidateCount;

		synchronized (sCorkLock) {
		invalidateCount = sInvalidates.getOrDefault(mPropertyName, (long) 0);
		}

		synchronized (mLock) {
		pw.println(String.format(" Cache Property Name: %s", cacheName()));
		pw.println(String.format(" Hits: %d, Misses: %d, Invalidates: %d",
		mHits, mMisses, invalidateCount));
		pw.println(String.format(" Last Observed Nonce: %d", mLastSeenNonce));
		pw.println(String.format(" Current Size: %d, Max Size: %d",
		mCache.entrySet().size(), mMaxEntries));