我正在编写一个定义远程服务的插件,并为第三方开发人员提供AIDL接口。
如何使用此远程服务处理不同客户端的并发请求?
这是服务apk的活动可以保持每个客户的状态,当他们在彼此之间切换时,该怎么做?
答案 0 :(得分:4)
这可以通过HandlerThread with Looper实现,无论是从100个应用程序收到的还是维护和服务所有请求。
对于这个AIDL回调接口也需要添加,因为请求将通过这些回调提供。
服务器应用程序
IAidlService.aidl
interface IAidlService {
void getStockInfo(IAidlCallback callback);
}
IAidlCallback.aidl
oneway interface IAidlCallback {
void handleStockInfo(in Stock stockinfo);
}
Stock.aidl
parcelable Stock;
Stock.java
public class Stock implements Parcelable {
String stockName;
public String getStockName() {
return stockName;
}
public void setStockName(String stockName) {
this.stockName = stockName;
}
@Override
public int describeContents() {
return 0;
}
@Override
public void writeToParcel(Parcel dest, int flags) {
dest.writeString(stockName);
}
public static final Creator<Stock> CREATOR = new Parcelable.Creator<Stock>() {
@Override
public Stock createFromParcel(Parcel in) {
return new Stock(in);
}
@Override
public Stock[] newArray(int size) {
return new Stock[size];
}
};
public Stock(Parcel in) {
this.stockName = in.readString();
}
public Stock() {}
}
AidlService.java
这是主要的Service类,它覆盖AIDL Service方法并实现它们。它还处理请求的返回,输出到请求它的特定应用程序。
public class AidlService extends Service {
private static final int MSG_STOCK_INFO = 53;
private ArrayList<IAidlCallback> mRemoteCallbacks;
private ServiceHandler mHandler = null;
HandlerThread mHandlerThread = new HandlerThread("AidlServiceThread");
@Override
public void onCreate() {
super.onCreate();
mRemoteCallbacks = new ArrayList<>();
}
@Override
public IBinder onBind(Intent intent) {
// Handler Thread handling all call back methods
mHandlerThread.start();
mHandler = new ServiceHandler(mHandlerThread.getLooper());
return mBinder;
}
/**
* Stub implementation for Remote service
*/
IAidlService.Stub mBinder = new IAidlService.Stub() {
@Override
public void getStockInfo(IAidlCallback callback) throws RemoteException {
sendMsgToHandler(callback, MSG_STOCK_INFO);
}
};
/**
* Create handler message to be sent
*
* @param callback
* @param flag
*/
void sendMsgToHandler(IAidlCallback callback, int flag) {
mRemoteCallbacks.add(callback);
Message message = mHandler.obtainMessage();
message.arg1 = mRemoteCallbacks.size() - 1;
message.what = flag;
mHandler.sendMessage(message);
}
/**
* Handler class sending result in callback to respective
* application
*/
private class ServiceHandler extends Handler {
int callbackIndex = 0;
ServiceHandler(Looper looper) {
super(looper);
}
@Override
public void handleMessage(Message msg) {
callbackIndex = msg.arg1;
switch (msg.what) {
case MSG_STOCK_INFO:
Stock stock = new Stock();
stock.setStockName("Apple Inc");
try {
mRemoteCallbacks.get(callbackIndex).handleStockInfo(stock);
} catch (RemoteException e) {
e.printStackTrace();
}
break;
}
}
}
}
客户端APP
在任何客户端应用程序中创建一个ServiceConnection
,一旦绑定到服务,您只需要为&#39; IAidlCallback`创建Stub类,并发送对象以及 getStockInfo 调用。喜欢:
IAidlCallback.Stub callback = new IAidlCallback.Stub() {
@Override
public void handleStockInfo(Stock stockinfo) throws RemoteException {
// do what ever you want with stock info :)
}
};
希望有所帮助:)
答案 1 :(得分:0)
与编写多线程服务器没什么不同。您为每个客户端保留线程本地状态,并可能为他们提供某种会话ID,以便您知道您正在与谁通话。