客户端/服务端App数据结构

ActivityThread

322    // The lock of mProviderMap protects the following variables.
323    final ArrayMap<ProviderKey, ProviderClientRecord> mProviderMap
324        = new ArrayMap<ProviderKey, ProviderClientRecord>();

332    final ArrayMap<IBinder, ProviderClientRecord> mLocalProviders
333        = new ArrayMap<IBinder, ProviderClientRecord>(); 
        //IBinder ->IContentProvider 代表服务端ContentProvider的代理

298    private static final class ProviderKey {
299        final String authority;
300        final int userId; //包含URL authority字符串

分三个角度来保存ProviderClientRecord

与AMS端的ContentProviderRecord想对应，主要保存IContentProvider (ContentProvider binder proxy)

465    final class ProviderClientRecord {
466        final String[] mNames;
467        final IContentProvider mProvider;
468        final ContentProvider mLocalProvider;
469        final ContentProviderHolder mHolder;
470
471        ProviderClientRecord(String[] names, IContentProvider provider,
472                ContentProvider localProvider, ContentProviderHolder holder) {
473            mNames = names;
474            mProvider = provider;
475            mLocalProvider = localProvider;
476            mHolder = holder;
477        }
478    }

frameworks/base/core/java/android/app/ContentProviderHolder

31public class ContentProviderHolder implements Parcelable {
32    public final ProviderInfo info;
33    public IContentProvider provider; //服务端ContentProvider proxy
34    public IBinder connection; //客户端在AMS中的表示，ContentProviderConnection对象的proxy,用于操作AMS中ContentProviderConnection对象的引用技术
35    public boolean noReleaseNeeded; 

330    final ArrayMap<IBinder, ProviderRefCount> mProviderRefCountMap
331        = new ArrayMap<IBinder, ProviderRefCount>();

ProviderRefCount: 封装了stable, unstable两种引用

4003    private static final class ProviderRefCount {
4004        public final ContentProviderHolder holder;
4005        public final ProviderClientRecord client;
4006        public int stableCount;
4007        public int unstableCount;

provider_app.jpg

system_server AMS中的数据结构

frameworks/base/services/core/java/com/android/server/am/ActivityManagerService
mProviderMap = new ProviderMap(this);
AMS端用来缓存ContentProviderRecord的对象，提供四种不同的查询方式

36/**
37 * Keeps track of content providers by authority (name) and class. It separates the mapping by
38 * user and ones that are not user-specific (system providers).
39 */
40public final class ProviderMap {
41
42    private static final String TAG = "ProviderMap";
43
44    private static final boolean DBG = false;
45
46    private final ActivityManagerService mAm;
47
48    private final HashMap<String, ContentProviderRecord> mSingletonByName
49            = new HashMap<String, ContentProviderRecord>();
50    private final HashMap<ComponentName, ContentProviderRecord> mSingletonByClass
51            = new HashMap<ComponentName, ContentProviderRecord>();
52
53    private final SparseArray<HashMap<String, ContentProviderRecord>> mProvidersByNamePerUser
54            = new SparseArray<HashMap<String, ContentProviderRecord>>();
55    private final SparseArray<HashMap<ComponentName, ContentProviderRecord>> mProvidersByClassPerUser
56            = new SparseArray<HashMap<ComponentName, ContentProviderRecord>>();

frameworks/base/services/core/java/com/android/server/am/ContentProviderRecord.java
provider在AMS中的封装类，主要引用了provider binder proxy、进程信息

35final class ContentProviderRecord {
36    final ActivityManagerService service;
37    public final ProviderInfo info;
38    final int uid;
39    final ApplicationInfo appInfo;
40    final ComponentName name;
41    final boolean singleton;
42    public IContentProvider provider; //服务端ContentProvider实例的binder对象
43    public boolean noReleaseNeeded;
44    // All attached clients
45    final ArrayList<ContentProviderConnection> connections
46            = new ArrayList<ContentProviderConnection>(); //对这个ContentProvider进行操作的客户端信息
47    //final HashSet<ProcessRecord> clients = new HashSet<ProcessRecord>();
48    // Handles for non-framework processes supported by this provider
49    HashMap<IBinder, ExternalProcessHandle> externalProcessTokenToHandle;
50    // Count for external process for which we have no handles.
51    int externalProcessNoHandleCount;
52    ProcessRecord proc; // if non-null, hosting process. //ContentProvider所在的宿主进程
53    ProcessRecord launchingApp; // if non-null, waiting for this app to be launched.
54    String stringName;
55    String shortStringName;

frameworks/base/services/core/java/com/android/server/am/ContentProviderConnection.java
主要引用了provider客户端的进程抽象，包含其要操作的ContentProvider端的信息ContentProviderRecord,以及客户端stable,unstable的引用计数

23/**
24 * Represents a link between a content provider and client.
25 */
26public final class ContentProviderConnection extends Binder {
27    public final ContentProviderRecord provider;
28    public final ProcessRecord client;
29    public final long createTime;
30    public int stableCount;
31    public int unstableCount;
32    // The client of this connection is currently waiting for the provider to appear.
33    // Protected by the provider lock.
34    public boolean waiting;
35    // The provider of this connection is now dead.
36    public boolean dead;
37
38    // For debugging.
39    public int numStableIncs;
40    public int numUnstableIncs;

provider_system_server.jpg