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Binder 应用层-AIDL原理

Binder 应用层-AIDL原理

作者: isLJli | 来源:发表于2022-02-18 10:49 被阅读0次

    Binder系列：
    Binder Kernel层—Binder内核驱动
    Binder Native层—服务管理(ServiceManager进程)
    Binder Native层—注册/查询服务
    Binder Framework层—注册和查询服务
    Binder 应用层-AIDL原理

    AIDL概述

    本篇文章讲解AIDL的原理，对于AIDL的使用详解可参考文档Android 接口定义语言 (AIDL)和Android AIDL使用详解

    AIDL支持的数据类型：

    1. 8种基本的数据类型：int、long、float、double、char、byte、short、boolean。
    2. String、CharSequence
    3. List<AIDL支持的数据类型>、Map<AIDL支持的数据类型,AIDL支持的数据类型>
    4. 声明为parcelable的aidl接口，先创建一个aidl接口，然后重建一个同名的java类并实现Parcelable序列化。
    // aidl接口
parcelable Book;

// java类
public class Book implements Parcelable {
  private String name;
  // ...
  protected Book(Parcel in) {
      this.name = in.readString();
  }

  public static final Creator<Book> CREATOR = new Creator<Book>() {
      @Override
      public Book createFromParcel(Parcel in) {
          return new Book(in);
      }

      @Override
      public Book[] newArray(int size) {
          return new Book[size];
      }
  };

  @Override
  public int describeContents() {
      return 0;
  }

  @Override
  public void writeToParcel(Parcel parcel, int i) {
      parcel.writeString(name);
  }


  public void readFromParcel(Parcel dest) {
      name = dest.readString();
  }

}

    AIDL的使用流程：

    1. AIDL是一种模版接口，通过该接口定义Server端对外提供的方法。AIDL接口通过syn gradle自动生成一个Service端的Binder对象Stub，和一个client端的代理对象Proxy。
    // BookController.aidl
package com.czy.server;
import com.czy.server.Book;

// Declare any non-default types here with import statements

interface BookController {
    List<Book> getBookList();
   void addBookInOut(inout Book book);

   void addBookIn(in Book book);

   void addBookOut(out Book book);
}

// 自动生成一个Java类
public interface BookController extends android.os.IInterface
{

/** Local-side IPC implementation stub class. */
public static abstract class Stub extends android.os.Binder implements com.czy.server.BookController
{
  private static final java.lang.String DESCRIPTOR = "com.czy.server.BookController";
  /** Construct the stub at attach it to the interface. */
  public Stub()
  {
    this.attachInterface(this, DESCRIPTOR);
  }
  /**
   * Cast an IBinder object into an com.czy.server.BookController interface,
   * generating a proxy if needed.
   */
  public static com.czy.server.BookController asInterface(android.os.IBinder obj)
  {
    if ((obj==null)) {
      return null;
    }
    android.os.IInterface iin = obj.queryLocalInterface(DESCRIPTOR);
    if (((iin!=null)&&(iin instanceof com.czy.server.BookController))) {
      return ((com.czy.server.BookController)iin);
    }
    return new com.czy.server.BookController.Stub.Proxy(obj);
  }
  @Override public android.os.IBinder asBinder()
  {
    return this;
  }
  @Override public boolean onTransact(int code, android.os.Parcel data, android.os.Parcel reply, int flags) throws android.os.RemoteException
  {
    java.lang.String descriptor = DESCRIPTOR;
    switch (code)
    {
      case INTERFACE_TRANSACTION:
      {
        reply.writeString(descriptor);
        return true;
      }
      case TRANSACTION_getBookList:
      {
        data.enforceInterface(descriptor);
        java.util.List<com.czy.server.Book> _result = this.getBookList();
        reply.writeNoException();
        reply.writeTypedList(_result);
        return true;
      }
      case TRANSACTION_addBookInOut:
      {
        data.enforceInterface(descriptor);
        com.czy.server.Book _arg0;
        if ((0!=data.readInt())) {
          _arg0 = com.czy.server.Book.CREATOR.createFromParcel(data);
        }
        else {
          _arg0 = null;
        }
        this.addBookInOut(_arg0);
        reply.writeNoException();
        if ((_arg0!=null)) {
          reply.writeInt(1);
          _arg0.writeToParcel(reply, android.os.Parcelable.PARCELABLE_WRITE_RETURN_VALUE);
        }
        else {
          reply.writeInt(0);
        }
        return true;
      }
      case TRANSACTION_addBookIn:
      {
        data.enforceInterface(descriptor);
        com.czy.server.Book _arg0;
        if ((0!=data.readInt())) {
          _arg0 = com.czy.server.Book.CREATOR.createFromParcel(data);
        }
        else {
          _arg0 = null;
        }
        this.addBookIn(_arg0);
        reply.writeNoException();
        return true;
      }
      case TRANSACTION_addBookOut:
      {
        data.enforceInterface(descriptor);
        com.czy.server.Book _arg0;
        _arg0 = new com.czy.server.Book();
        this.addBookOut(_arg0);
        reply.writeNoException();
        if ((_arg0!=null)) {
          reply.writeInt(1);
          _arg0.writeToParcel(reply, android.os.Parcelable.PARCELABLE_WRITE_RETURN_VALUE);
        }
        else {
          reply.writeInt(0);
        }
        return true;
      }
      default:
      {
        return super.onTransact(code, data, reply, flags);
      }
    }
  }
  private static class Proxy implements com.czy.server.BookController
  {
    private android.os.IBinder mRemote;
    Proxy(android.os.IBinder remote)
    {
      mRemote = remote;
    }
    @Override public android.os.IBinder asBinder()
    {
      return mRemote;
    }
    public java.lang.String getInterfaceDescriptor()
    {
      return DESCRIPTOR;
    }
    @Override public java.util.List<com.czy.server.Book> getBookList() throws android.os.RemoteException
    {
      android.os.Parcel _data = android.os.Parcel.obtain();
      android.os.Parcel _reply = android.os.Parcel.obtain();
      java.util.List<com.czy.server.Book> _result;
      try {
        _data.writeInterfaceToken(DESCRIPTOR);
        boolean _status = mRemote.transact(Stub.TRANSACTION_getBookList, _data, _reply, 0);
        if (!_status && getDefaultImpl() != null) {
          return getDefaultImpl().getBookList();
        }
        _reply.readException();
        _result = _reply.createTypedArrayList(com.czy.server.Book.CREATOR);
      }
      finally {
        _reply.recycle();
        _data.recycle();
      }
      return _result;
    }
    @Override public void addBookInOut(com.czy.server.Book book) throws android.os.RemoteException
    {
      //...
    }
    @Override public void addBookIn(com.czy.server.Book book) throws android.os.RemoteException
    {
      //...
    }
    @Override public void addBookOut(com.czy.server.Book book) throws android.os.RemoteException
    {
     //...
    }
    public static com.czy.server.BookController sDefaultImpl;
  }
  static final int TRANSACTION_getBookList = (android.os.IBinder.FIRST_CALL_TRANSACTION + 0);
  static final int TRANSACTION_addBookInOut = (android.os.IBinder.FIRST_CALL_TRANSACTION + 1);
  static final int TRANSACTION_addBookIn = (android.os.IBinder.FIRST_CALL_TRANSACTION + 2);
  static final int TRANSACTION_addBookOut = (android.os.IBinder.FIRST_CALL_TRANSACTION + 3);
  public static boolean setDefaultImpl(com.czy.server.BookController impl) {
    // Only one user of this interface can use this function
    // at a time. This is a heuristic to detect if two different
    // users in the same process use this function.
    if (Stub.Proxy.sDefaultImpl != null) {
      throw new IllegalStateException("setDefaultImpl() called twice");
    }
    if (impl != null) {
      Stub.Proxy.sDefaultImpl = impl;
      return true;
    }
    return false;
  }
  public static com.czy.server.BookController getDefaultImpl() {
    return Stub.Proxy.sDefaultImpl;
  }
}
public java.util.List<com.czy.server.Book> getBookList() throws android.os.RemoteException;
public void addBookInOut(com.czy.server.Book book) throws android.os.RemoteException;
public void addBookIn(com.czy.server.Book book) throws android.os.RemoteException;
public void addBookOut(com.czy.server.Book book) throws android.os.RemoteException;
}
    1. Service端通过建立一个Service，在其onBind方法中返回AIDL接口自动生成的Binder对象(Stub),并实现Server端对外提供的方法。
    public class AIDLService extends Service {

   //... 
  private final BookController.Stub stub = new BookController.Stub() {
      @Override
      public List<Book> getBookList() throws RemoteException {
          return bookList;
      }
      // ... 接口方法的实现
  };


  @Nullable
  @Override
  public IBinder onBind(Intent intent) {
      return stub;
  }

}
    1. Client通过启动Server端的Service，并利用ServiceConnection进行监听获取到Client端的代理对象Proxy，并通过Proxy进行对Server方法的调用。
     private val serviceConnection = object : ServiceConnection {
      override fun onServiceConnected(p0: ComponentName?, p1: IBinder?) {
          bookController = BookController.Stub.asInterface(p1)
          isConnected = true
      }

      override fun onServiceDisconnected(p0: ComponentName?) {
          bookController = null
          isConnected = true
      }
  }

val intent = Intent(this,com.aidl.server.AIDLService)
      intent.also {
          bindService(it, serviceConnection, Context.BIND_AUTO_CREATE)
      }

    AIDL的原理

    AIDL是基于Binder机制进行通信，通过模版接口进行编译自动生成一个包含Server端的Binder对象(Stub)，和一个Client的代理对象(Proxy)：

    public interface BookController extends android.os.IInterface
{

/** Local-side IPC implementation stub class. */
public static abstract class Stub extends android.os.Binder implements com.czy.server.BookController
{
  private static final java.lang.String DESCRIPTOR = "com.czy.server.BookController";
  /** Construct the stub at attach it to the interface. */
  public Stub()
  {
    this.attachInterface(this, DESCRIPTOR);
  }
  /**
   * Cast an IBinder object into an com.czy.server.BookController interface,
   * generating a proxy if needed.
   */
  public static com.czy.server.BookController asInterface(android.os.IBinder obj)
  {
    if ((obj==null)) {
      return null;
    }
    android.os.IInterface iin = obj.queryLocalInterface(DESCRIPTOR);
    if (((iin!=null)&&(iin instanceof com.czy.server.BookController))) {
      return ((com.czy.server.BookController)iin);
    }
    return new com.czy.server.BookController.Stub.Proxy(obj);
  }
  @Override public android.os.IBinder asBinder()
  {
    return this;
  }
  @Override public boolean onTransact(int code, android.os.Parcel data, android.os.Parcel reply, int flags) throws android.os.RemoteException
  {
    java.lang.String descriptor = DESCRIPTOR;
    switch (code)
    {
      case INTERFACE_TRANSACTION:
      {
        reply.writeString(descriptor);
        return true;
      }
      case TRANSACTION_getBookList:
      {
        data.enforceInterface(descriptor);
        java.util.List<com.czy.server.Book> _result = this.getBookList();
        reply.writeNoException();
        reply.writeTypedList(_result);
        return true;
      }
      case TRANSACTION_addBookInOut:
      {
        data.enforceInterface(descriptor);
        com.czy.server.Book _arg0;
        if ((0!=data.readInt())) {
          _arg0 = com.czy.server.Book.CREATOR.createFromParcel(data);
        }
        else {
          _arg0 = null;
        }
        this.addBookInOut(_arg0);
        reply.writeNoException();
        if ((_arg0!=null)) {
          reply.writeInt(1);
          _arg0.writeToParcel(reply, android.os.Parcelable.PARCELABLE_WRITE_RETURN_VALUE);
        }
        else {
          reply.writeInt(0);
        }
        return true;
      }
      case TRANSACTION_addBookIn:
      {
        data.enforceInterface(descriptor);
        com.czy.server.Book _arg0;
        if ((0!=data.readInt())) {
          _arg0 = com.czy.server.Book.CREATOR.createFromParcel(data);
        }
        else {
          _arg0 = null;
        }
        this.addBookIn(_arg0);
        reply.writeNoException();
        return true;
      }
      case TRANSACTION_addBookOut:
      {
        data.enforceInterface(descriptor);
        com.czy.server.Book _arg0;
        _arg0 = new com.czy.server.Book();
        this.addBookOut(_arg0);
        reply.writeNoException();
        if ((_arg0!=null)) {
          reply.writeInt(1);
          _arg0.writeToParcel(reply, android.os.Parcelable.PARCELABLE_WRITE_RETURN_VALUE);
        }
        else {
          reply.writeInt(0);
        }
        return true;
      }
      default:
      {
        return super.onTransact(code, data, reply, flags);
      }
    }
  }
  private static class Proxy implements com.czy.server.BookController
  {
    private android.os.IBinder mRemote;
    Proxy(android.os.IBinder remote)
    {
      mRemote = remote;
    }
    @Override public android.os.IBinder asBinder()
    {
      return mRemote;
    }
    public java.lang.String getInterfaceDescriptor()
    {
      return DESCRIPTOR;
    }
    @Override public java.util.List<com.czy.server.Book> getBookList() throws android.os.RemoteException
    {
      android.os.Parcel _data = android.os.Parcel.obtain();
      android.os.Parcel _reply = android.os.Parcel.obtain();
      java.util.List<com.czy.server.Book> _result;
      try {
        _data.writeInterfaceToken(DESCRIPTOR);
        boolean _status = mRemote.transact(Stub.TRANSACTION_getBookList, _data, _reply, 0);
        if (!_status && getDefaultImpl() != null) {
          return getDefaultImpl().getBookList();
        }
        _reply.readException();
        _result = _reply.createTypedArrayList(com.czy.server.Book.CREATOR);
      }
      finally {
        _reply.recycle();
        _data.recycle();
      }
      return _result;
    }
    @Override public void addBookInOut(com.czy.server.Book book) throws android.os.RemoteException
    {
      android.os.Parcel _data = android.os.Parcel.obtain();
      android.os.Parcel _reply = android.os.Parcel.obtain();
      try {
        _data.writeInterfaceToken(DESCRIPTOR);
        if ((book!=null)) {
          _data.writeInt(1);
          book.writeToParcel(_data, 0);
        }
        else {
          _data.writeInt(0);
        }
        boolean _status = mRemote.transact(Stub.TRANSACTION_addBookInOut, _data, _reply, 0);
        if (!_status && getDefaultImpl() != null) {
          getDefaultImpl().addBookInOut(book);
          return;
        }
        _reply.readException();
        if ((0!=_reply.readInt())) {
          book.readFromParcel(_reply);
        }
      }
      finally {
        _reply.recycle();
        _data.recycle();
      }
    }
    @Override public void addBookIn(com.czy.server.Book book) throws android.os.RemoteException
    {
      android.os.Parcel _data = android.os.Parcel.obtain();
      android.os.Parcel _reply = android.os.Parcel.obtain();
      try {
        _data.writeInterfaceToken(DESCRIPTOR);
        if ((book!=null)) {
          _data.writeInt(1);
          book.writeToParcel(_data, 0);
        }
        else {
          _data.writeInt(0);
        }
        boolean _status = mRemote.transact(Stub.TRANSACTION_addBookIn, _data, _reply, 0);
        if (!_status && getDefaultImpl() != null) {
          getDefaultImpl().addBookIn(book);
          return;
        }
        _reply.readException();
      }
      finally {
        _reply.recycle();
        _data.recycle();
      }
    }
    @Override public void addBookOut(com.czy.server.Book book) throws android.os.RemoteException
    {
      android.os.Parcel _data = android.os.Parcel.obtain();
      android.os.Parcel _reply = android.os.Parcel.obtain();
      try {
        _data.writeInterfaceToken(DESCRIPTOR);
        boolean _status = mRemote.transact(Stub.TRANSACTION_addBookOut, _data, _reply, 0);
        if (!_status && getDefaultImpl() != null) {
          getDefaultImpl().addBookOut(book);
          return;
        }
        _reply.readException();
        if ((0!=_reply.readInt())) {
          book.readFromParcel(_reply);
        }
      }
      finally {
        _reply.recycle();
        _data.recycle();
      }
    }
    public static com.czy.server.BookController sDefaultImpl;
  }
  static final int TRANSACTION_getBookList = (android.os.IBinder.FIRST_CALL_TRANSACTION + 0);
  static final int TRANSACTION_addBookInOut = (android.os.IBinder.FIRST_CALL_TRANSACTION + 1);
  static final int TRANSACTION_addBookIn = (android.os.IBinder.FIRST_CALL_TRANSACTION + 2);
  static final int TRANSACTION_addBookOut = (android.os.IBinder.FIRST_CALL_TRANSACTION + 3);
  public static boolean setDefaultImpl(com.czy.server.BookController impl) {
    // Only one user of this interface can use this function
    // at a time. This is a heuristic to detect if two different
    // users in the same process use this function.
    if (Stub.Proxy.sDefaultImpl != null) {
      throw new IllegalStateException("setDefaultImpl() called twice");
    }
    if (impl != null) {
      Stub.Proxy.sDefaultImpl = impl;
      return true;
    }
    return false;
  }
  public static com.czy.server.BookController getDefaultImpl() {
    return Stub.Proxy.sDefaultImpl;
  }
}

// 接口方法
public java.util.List<com.czy.server.Book> getBookList() throws android.os.RemoteException;
public void addBookInOut(com.czy.server.Book book) throws android.os.RemoteException;
public void addBookIn(com.czy.server.Book book) throws android.os.RemoteException;
public void addBookOut(com.czy.server.Book book) throws android.os.RemoteException;
}

    1. 首先定义Java接口

    首先根据aidl文件，生成一个同名的Java接口，并继承IInterface

    public interface BookController extends android.os.IInterface
{
// 接口方法
public java.util.List<com.czy.server.Book> getBookList() throws android.os.RemoteException;
public void addBookInOut(com.czy.server.Book book) throws android.os.RemoteException;
public void addBookIn(com.czy.server.Book book) throws android.os.RemoteException;
public void addBookOut(com.czy.server.Book book) throws android.os.RemoteException;
}

    2. Stub

    生成一个代表Server端Binder的抽象类Stub，该Stub继承Binder类，并继承BookController接口，但Stub并没有实现BookController接口的方法而是留给Service实现。

    /** Local-side IPC implementation stub class. */
public static abstract class Stub extends android.os.Binder implements com.czy.server.BookController
{
  private static final java.lang.String DESCRIPTOR = "com.czy.server.BookController";
  /** Construct the stub at attach it to the interface. */
  public Stub()
  {
    this.attachInterface(this, DESCRIPTOR);
  }
  
  // 1. asInterface方法返回Proxy客户端的代理对象
  public static com.czy.server.BookController asInterface(android.os.IBinder obj)
  {
    if ((obj==null)) {
      return null;
    }
    android.os.IInterface iin = obj.queryLocalInterface(DESCRIPTOR);
    if (((iin!=null)&&(iin instanceof com.czy.server.BookController))) {
      return ((com.czy.server.BookController)iin);
    }
    return new com.czy.server.BookController.Stub.Proxy(obj);
  }

  @Override public android.os.IBinder asBinder()
  {
    return this;
  }

   // 处理Client端的请求
  @Override public boolean onTransact(int code, android.os.Parcel data, android.os.Parcel reply, int flags) throws android.os.RemoteException
  {
    java.lang.String descriptor = DESCRIPTOR;
    switch (code)
    {
      case INTERFACE_TRANSACTION:
      {
        reply.writeString(descriptor);
        return true;
      }
      case TRANSACTION_getBookList:
      {
        data.enforceInterface(descriptor);
        // 调用实例的getBookList()方法
        java.util.List<com.czy.server.Book> _result = this.getBookList();
        reply.writeNoException();
        // 把返回的数据回传给Client端
        reply.writeTypedList(_result);
        return true;
      }
      case TRANSACTION_addBookInOut:
      {
        data.enforceInterface(descriptor);
        com.czy.server.Book _arg0;
        if ((0!=data.readInt())) {
          _arg0 = com.czy.server.Book.CREATOR.createFromParcel(data);
        }
        else {
          _arg0 = null;
        }
        // 调用实例的addBookInOut方法
        this.addBookInOut(_arg0);
        reply.writeNoException();
        if ((_arg0!=null)) {
          reply.writeInt(1);
          _arg0.writeToParcel(reply, android.os.Parcelable.PARCELABLE_WRITE_RETURN_VALUE);
        }
        else {
          reply.writeInt(0);
        }
        return true;
      }
   
      default:
      {
        return super.onTransact(code, data, reply, flags);
      }
    }
  }

   // 逐渐+1的方式生存方法的对应的命令协议
  static final int TRANSACTION_getBookList = (android.os.IBinder.FIRST_CALL_TRANSACTION + 0);
  static final int TRANSACTION_addBookInOut = (android.os.IBinder.FIRST_CALL_TRANSACTION + 1);
  static final int TRANSACTION_addBookIn = (android.os.IBinder.FIRST_CALL_TRANSACTION + 2);
  static final int TRANSACTION_addBookOut = (android.os.IBinder.FIRST_CALL_TRANSACTION + 3);
  public static boolean setDefaultImpl(com.czy.server.BookController impl) {
    // Only one user of this interface can use this function
    // at a time. This is a heuristic to detect if two different
    // users in the same process use this function.
    if (Stub.Proxy.sDefaultImpl != null) {
      throw new IllegalStateException("setDefaultImpl() called twice");
    }
    if (impl != null) {
      Stub.Proxy.sDefaultImpl = impl;
      return true;
    }
    return false;
  }
  public static com.czy.server.BookController getDefaultImpl() {
    return Stub.Proxy.sDefaultImpl;
  }
}

    Stub对象的asInterface方法返回一个客户端的Proxy对象。onTransact()方法根据命令协议执行不同的方法。

    3. Proxy

    客户端代理对象Proxy,其并没有继承Binder,而是继承了接口。

      private static class Proxy implements com.czy.server.BookController
  {
    private android.os.IBinder mRemote;
    Proxy(android.os.IBinder remote)
    {
      mRemote = remote;
    }
    @Override public android.os.IBinder asBinder()
    {
      return mRemote;
    }
    public java.lang.String getInterfaceDescriptor()
    {
      return DESCRIPTOR;
    }
    @Override public java.util.List<com.czy.server.Book> getBookList() throws android.os.RemoteException
    {
      android.os.Parcel _data = android.os.Parcel.obtain();
      android.os.Parcel _reply = android.os.Parcel.obtain();
      java.util.List<com.czy.server.Book> _result;
      try {
        _data.writeInterfaceToken(DESCRIPTOR);
        boolean _status = mRemote.transact(Stub.TRANSACTION_getBookList, _data, _reply, 0);
        if (!_status && getDefaultImpl() != null) {
          return getDefaultImpl().getBookList();
        }
        _reply.readException();
        _result = _reply.createTypedArrayList(com.czy.server.Book.CREATOR);
      }
      finally {
        _reply.recycle();
        _data.recycle();
      }
      return _result;
    }
    @Override public void addBookInOut(com.czy.server.Book book) throws android.os.RemoteException
    {
      android.os.Parcel _data = android.os.Parcel.obtain();
      android.os.Parcel _reply = android.os.Parcel.obtain();
      try {
        _data.writeInterfaceToken(DESCRIPTOR);
        if ((book!=null)) {
          _data.writeInt(1);
          book.writeToParcel(_data, 0);
        }
        else {
          _data.writeInt(0);
        }
        boolean _status = mRemote.transact(Stub.TRANSACTION_addBookInOut, _data, _reply, 0);
        if (!_status && getDefaultImpl() != null) {
          getDefaultImpl().addBookInOut(book);
          return;
        }
        _reply.readException();
        if ((0!=_reply.readInt())) {
          book.readFromParcel(_reply);
        }
      }
      finally {
        _reply.recycle();
        _data.recycle();
      }
    }
    @Override public void addBookIn(com.czy.server.Book book) throws android.os.RemoteException
    {
      android.os.Parcel _data = android.os.Parcel.obtain();
      android.os.Parcel _reply = android.os.Parcel.obtain();
      try {
        _data.writeInterfaceToken(DESCRIPTOR);
        if ((book!=null)) {
          _data.writeInt(1);
          book.writeToParcel(_data, 0);
        }
        else {
          _data.writeInt(0);
        }
        boolean _status = mRemote.transact(Stub.TRANSACTION_addBookIn, _data, _reply, 0);
        if (!_status && getDefaultImpl() != null) {
          getDefaultImpl().addBookIn(book);
          return;
        }
        _reply.readException();
      }
      finally {
        _reply.recycle();
        _data.recycle();
      }
    }
    @Override public void addBookOut(com.czy.server.Book book) throws android.os.RemoteException
    {
      android.os.Parcel _data = android.os.Parcel.obtain();
      android.os.Parcel _reply = android.os.Parcel.obtain();
      try {
        _data.writeInterfaceToken(DESCRIPTOR);
        boolean _status = mRemote.transact(Stub.TRANSACTION_addBookOut, _data, _reply, 0);
        if (!_status && getDefaultImpl() != null) {
          getDefaultImpl().addBookOut(book);
          return;
        }
        _reply.readException();
        if ((0!=_reply.readInt())) {
          book.readFromParcel(_reply);
        }
      }
      finally {
        _reply.recycle();
        _data.recycle();
      }
    }
    public static com.czy.server.BookController sDefaultImpl;
  }

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