Prevents an NPE when content provider is slow to start (140fc2e9) · Commits · e / os / android_frameworks_base

core/java/android/content/ContentResolver.java

+21 −2

Original line number	Diff line number	Diff line
		@@ -700,6 +700,27 @@ public abstract class ContentResolver implements ContentInterface {
		/** @hide */
		public static final String REMOTE_CALLBACK_RESULT = "result";

		/**
		* How long we wait for an attached process to publish its content providers
		* before we decide it must be hung.
		* @hide
		*/
		public static final int CONTENT_PROVIDER_PUBLISH_TIMEOUT_MILLIS = 10 * 1000;

		/**
		* How long we wait for an provider to be published. Should be longer than
		* {@link #CONTENT_PROVIDER_PUBLISH_TIMEOUT_MILLIS}.
		* @hide
		*/
		public static final int CONTENT_PROVIDER_WAIT_TIMEOUT_MILLIS =
		CONTENT_PROVIDER_PUBLISH_TIMEOUT_MILLIS + 10 * 1000;

		// Should be >= {@link #CONTENT_PROVIDER_WAIT_TIMEOUT_MILLIS}, because that's how
		// long ActivityManagerService is giving a content provider to get published if a new process
		// needs to be started for that.
		private static final int GET_TYPE_TIMEOUT_MILLIS =
		CONTENT_PROVIDER_WAIT_TIMEOUT_MILLIS + 5 * 1000;

		public ContentResolver(@Nullable Context context) {
		this(context, null);
		}
		@@ -849,8 +870,6 @@ public abstract class ContentResolver implements ContentInterface {
		}
		}

		private static final int GET_TYPE_TIMEOUT_MILLIS = 3000;

		private static class GetTypeResultListener implements RemoteCallback.OnResultListener {
		@GuardedBy("this")
		public boolean done;

core/tests/coretests/AndroidManifest.xml

+6 −0

Original line number	Diff line number	Diff line
		@@ -1326,6 +1326,12 @@
		android:process=":FakeProvider">
		</provider>

		<provider
		android:name="android.content.SlowProvider"
		android:authorities="android.content.SlowProvider"
		android:process=":SlowProvider">
		</provider>

		<!-- Application components used for os tests -->

		<service android:name="android.os.MessengerService"

core/tests/coretests/src/android/content/ContentResolverTest.java

+9 −0

Original line number	Diff line number	Diff line
		@@ -209,4 +209,13 @@ public class ContentResolverTest {
		String type = mResolver.getType(Uri.parse("content://android.content.FakeProviderRemote"));
		assertEquals("fake/remote", type);
		}


		@Test
		public void testGetType_slowProvider() {
		// This provider is running in a different process and is intentionally slow to start.
		// We are trying to confirm that it does not cause an ANR
		String type = mResolver.getType(Uri.parse("content://android.content.SlowProvider"));
		assertEquals("slow", type);
		}
		}

core/tests/coretests/src/android/content/SlowProvider.java

0 → 100644

+65 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) 2020 The Android Open Source Project
		*
		* Licensed under the Apache License, Version 2.0 (the "License");
		* you may not use this file except in compliance with the License.
		* You may obtain a copy of the License at
		*
		* http://www.apache.org/licenses/LICENSE-2.0
		*
		* Unless required by applicable law or agreed to in writing, software
		* distributed under the License is distributed on an "AS IS" BASIS,
		* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
		* See the License for the specific language governing permissions and
		* limitations under the License.
		*/

		package android.content;

		import android.database.Cursor;
		import android.net.Uri;

		/**
		* A dummy content provider for tests. This provider runs in a different process from the test and
		* is intentionally slow.
		*/
		public class SlowProvider extends ContentProvider {

		private static final int ON_CREATE_LATENCY_MILLIS = 3000;

		@Override
		public boolean onCreate() {
		try {
		Thread.sleep(ON_CREATE_LATENCY_MILLIS);
		} catch (InterruptedException e) {
		// Ignore
		}
		return true;
		}

		@Override
		public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs,
		String sortOrder) {
		return null;
		}

		@Override
		public String getType(Uri uri) {
		return "slow";
		}

		@Override
		public Uri insert(Uri uri, ContentValues values) {
		return null;
		}

		@Override
		public int delete(Uri uri, String selection, String[] selectionArgs) {
		return 0;
		}

		@Override
		public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
		return 0;
		}
		}

services/core/java/com/android/server/am/ActivityManagerService.java

+11 −16

Original line number	Diff line number	Diff line
		@@ -466,18 +466,9 @@ public class ActivityManagerService extends IActivityManager.Stub
		// How long we wait for a launched process to attach to the activity manager
		// before we decide it's never going to come up for real.
		static final int PROC_START_TIMEOUT = 10*1000;
		// How long we wait for an attached process to publish its content providers
		// before we decide it must be hung.
		static final int CONTENT_PROVIDER_PUBLISH_TIMEOUT = 10*1000;

		// How long we wait to kill an application zygote, after the last process using
		// it has gone away.
		static final int KILL_APP_ZYGOTE_DELAY_MS = 5 * 1000;
		/**
		* How long we wait for an provider to be published. Should be longer than
		* {@link #CONTENT_PROVIDER_PUBLISH_TIMEOUT}.
		*/
		static final int CONTENT_PROVIDER_WAIT_TIMEOUT = 20 * 1000;

		// How long we wait for a launched process to attach to the activity manager
		// before we decide it's never going to come up for real, when the process was
		@@ -4934,7 +4925,8 @@ public class ActivityManagerService extends IActivityManager.Stub
		if (providers != null && checkAppInLaunchingProvidersLocked(app)) {
		Message msg = mHandler.obtainMessage(CONTENT_PROVIDER_PUBLISH_TIMEOUT_MSG);
		msg.obj = app;
		mHandler.sendMessageDelayed(msg, CONTENT_PROVIDER_PUBLISH_TIMEOUT);
		mHandler.sendMessageDelayed(msg,
		ContentResolver.CONTENT_PROVIDER_PUBLISH_TIMEOUT_MILLIS);
		}

		checkTime(startTime, "attachApplicationLocked: before bindApplication");
		@@ -7198,7 +7190,8 @@ public class ActivityManagerService extends IActivityManager.Stub
		}

		// Wait for the provider to be published...
		final long timeout = SystemClock.uptimeMillis() + CONTENT_PROVIDER_WAIT_TIMEOUT;
		final long timeout =
		SystemClock.uptimeMillis() + ContentResolver.CONTENT_PROVIDER_WAIT_TIMEOUT_MILLIS;
		boolean timedOut = false;
		synchronized (cpr) {
		while (cpr.provider == null) {
		@@ -7235,14 +7228,16 @@ public class ActivityManagerService extends IActivityManager.Stub
		}
		}
		if (timedOut) {
		// Note we do it afer releasing the lock.
		// Note we do it after releasing the lock.
		String callerName = "unknown";
		if (caller != null) {
		synchronized (this) {
		final ProcessRecord record = mProcessList.getLRURecordForAppLocked(caller);
		if (record != null) {
		callerName = record.processName;
		}
		}
		}

		Slog.wtf(TAG, "Timeout waiting for provider "
		+ cpi.applicationInfo.packageName + "/"