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56 lines
1.4 KiB
56 lines
1.4 KiB
---
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说一说 binder 的 oneway 机制
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---
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1. binder 的 oneway 是什么意思？
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2. oneway 有哪些特性？
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3. 它的实现原理是怎样的？
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```java
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interface IRemoteCaller{
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void publishBinder(ICallback callback);
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}
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public void publishBinder(ICallback callback){
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mRemote.transact(Stub.TRANSACTION_publishBinder, _data, _reply, 0);
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}
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oneway interface IRemoteCaller{
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void publishBinder(ICallback callback);
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}
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public void publishBinder(ICallback callback){
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mRemote.transact(Stub.TRANSACTION_publishBinder, _data, null, IBinder.FLAG_ONEWAY);
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}
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```
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```c++
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// 带 oneway
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status_t transact(int32_t handle, uint32_t code, Parcel& data, Parcel* reply, uint32_t flags){
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writeTransactionData(BC_TRANSACTION, flags, handle, code, data, NULL);
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waitForResponse(NULL, NULL);
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}
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// 不带 oneway
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status_t transact(int32_t handle, uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags){
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writeTransactionData(BC_TRANSACTION, flags, handle, code, data, NULL);
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waitForResponse(reply);
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}
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```
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例子：
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```java
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final void scheduleLauncherActivity(Intent intent, IBinder token, ...){
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mRemote.transact(SCHEDULT_LAUNCH_ACTIVITY_TRANSACTION, data, null, IBinder.FLAG_ONEWAY);
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}
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oneway interface IWindow{}
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oneway interface IServiceConnection{}
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oneway interface IIntentReceiver{}
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```
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#### 总结
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1. oneway 是异步 binder 调用
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2. server 端串行化处理
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3. oneway 的实现机制
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