Log excessive remote callbacks (18a23f2f) · Commits · e / os / android_frameworks_base

core/java/android/os/RemoteCallbackList.java

+28 −1

Original line number	Original line	Diff line number	Diff line
	@@ -17,6 +17,7 @@
	package android.os;		package android.os;

	import android.util.ArrayMap;		import android.util.ArrayMap;
			import android.util.Slog;

	import java.util.function.Consumer;		import java.util.function.Consumer;

	@@ -49,11 +50,14 @@ import java.util.function.Consumer;
	* implements the {@link #onCallbackDied} method.		* implements the {@link #onCallbackDied} method.
	*/		*/
	public class RemoteCallbackList<E extends IInterface> {		public class RemoteCallbackList<E extends IInterface> {
			private static final String TAG = "RemoteCallbackList";

	/package/ ArrayMap<IBinder, Callback> mCallbacks		/package/ ArrayMap<IBinder, Callback> mCallbacks
	= new ArrayMap<IBinder, Callback>();		= new ArrayMap<IBinder, Callback>();
	private Object[] mActiveBroadcast;		private Object[] mActiveBroadcast;
	private int mBroadcastCount = -1;		private int mBroadcastCount = -1;
	private boolean mKilled = false;		private boolean mKilled = false;
			private StringBuilder mRecentCallers;

	private final class Callback implements IBinder.DeathRecipient {		private final class Callback implements IBinder.DeathRecipient {
	final E mCallback;		final E mCallback;
	@@ -111,6 +115,8 @@ public class RemoteCallbackList<E extends IInterface> {
	if (mKilled) {		if (mKilled) {
	return false;		return false;
	}		}
			// Flag unusual case that could be caused by a leak. b/36778087
			logExcessiveCallbacks();
	IBinder binder = callback.asBinder();		IBinder binder = callback.asBinder();
	try {		try {
	Callback cb = new Callback(callback, cookie);		Callback cb = new Callback(callback, cookie);
	@@ -392,4 +398,25 @@ public class RemoteCallbackList<E extends IInterface> {
	return mCallbacks.valueAt(index).mCookie;		return mCallbacks.valueAt(index).mCookie;
	}		}
	}		}

			private void logExcessiveCallbacks() {
			final long size = mCallbacks.size();
			final long TOO_MANY = 3000;
			final long MAX_CHARS = 1000;
			if (size >= TOO_MANY) {
			if (size == TOO_MANY && mRecentCallers == null) {
			mRecentCallers = new StringBuilder();
			}
			if (mRecentCallers != null && mRecentCallers.length() < MAX_CHARS) {
			mRecentCallers.append(Debug.getCallers(5));
			mRecentCallers.append('\n');
			if (mRecentCallers.length() >= MAX_CHARS) {
			Slog.wtf(TAG, "More than "
			+ TOO_MANY + " remote callbacks registered. Recent callers:\n"
			+ mRecentCallers.toString());
			mRecentCallers = null;
			}
			}
			}
			}
	}		}