What is synchronous/asynchronous API? Synchronous/asynchronousAPIs areapplication programming interfacesthat return data for requests either immediately or at a later time, respectively. Synchronous/asynchronous APIs provide a way to make immediate or scheduled requests for resources, data or services when ...
为了确定Qos1和Qos2(详见Quality of service)的信息已经成功传递,应用程序必须调用MQTTClient_waitForCompletion()这个函数。一个展示同步发布的例子可查看Synchronous publication example。同步模式下接收信息使用MQTTClient_receive()函数,客户端应用程序必须相对频繁地调用MQTTClient_receive()或MQTTClient_yield(),以便允许...
The previous code revisions help get everything ready for breakfast at the same time, except the toast. The process of making the toast is acompositionof an asynchronous operation (toast the bread) with synchronous operations (spread butter and jam on the toast). This example illustrates an imp...
Gmail is another wildly popular example of asynchronous APIs in action. While some parts of theGmail APImay function similarly to a synchronous API, the API is largely an asynchronous API since there is no expectation of an immediate response when dealing with emails. Messages can be created, m...
If such an activity is blocked within a synchronous process, the entire application must wait. In an asynchronous process, the application can continue with other work that doesn't depend on the web resource until the potentially blocking task finishes. The following table shows typical areas ...
public class AsyncExample { // Synchronous methods. public int Method1(string param); public void Method2(double param); // Asynchronous methods. public void Method1Async(string param); public void Method1Async(string param, object userState); public event Method1CompletedEvent...
SQLSetConnectAttrsupports asynchronous operations but the invocation ofSQLSetConnectAttrto set SQL_ATTR_ASYNC_DBC_EVENT is always synchronous. SQLSetStmtAttrdoes not support asynchronous execution. Error-out scenario WhenSQLSetConnectAttris called before making a connection, the Driver Manager cannot determine whic...
chain multiple asynchronous and synchronous operations together handle exceptions in task chains perform cancellation in task chains ensure that individual tasks run in the appropriate thread context or apartmentThis article provides basic guidance about how to use the task class with the W...
Strongly typed programming languages, such as Java or C#, can take advantage of having two distinctly named API calls for synchronous and asynchronous executions. The two calls can have different return types. For example, Connector/J can use execute() to return a RowResult or DocResult and ex...
Synchronous Reading Notifications Status Bars Overview ITextSelection LINE_CLOSE message (Windows) Intsafe.h Functions MSMQQueue.PeekLastByLookupId Icons and Icon Overlays Text Object Model IFileViewerSite PROPID_MGMT_MSMQ_BYTES_IN_ALL_QUEUES Visual Basic Code Example: Enforcing Target Journaling Enumeratio...