Programming VIP

Message mechanismPulsar adopts the pub sub design pattern. In this design pattern, the producer publishes messages to topic, and the Consumer subscribes to topic, processes the published messages, and sends a confirmation after processing.Once a subscription is created, Pulsar can still save all messages even if the consumer is disconnected. Th ...

In Android development, program Crash can be divided into three cases: uncapped exception, anr (Application Not Responding) and flash back (error caused by NDK). The uncapped exception is easy to locate the error according to the stack information printed by logcat. It is easy to check the anr error. Android stipulates that if the application d ...

An Apache Druid architecture 1. Coordinator Monitor historical processing, and be responsible for allocating segments to the specified service to ensure that historical data is self balanced 2. Overlord Monitor the MiddleManager to process and control data loading into the druid cluster; Responsible for the ingestion tasks assigned to the M ...

Virtual assistant client (Android) Use the virtual assistant client application to chat with your virtual assistant and set it as the default assistant on your device. preparation install Android Studio . download Virtual assistant client source code . Create a virtual assistant To set up the virtual assistant environment. On the new ...

Nginx services Nginx is a high-performance, lightweight Web service software, which has the advantages of high stability, low system resource consumption and high processing capacity for HTTP concurrent connections (a single physical server can support 30000 ~ 50000 concurrent requests) Advantages of Nginx over Apache: Lightweight, also ...

Apache Flume 1. General Flume is a highly available, reliable and distributed software for massive log collection, aggregation and transmission provided by Cloudera. The core of flume is to collect data from the data source, and then send the collected data to the specified destination (sink). In order to ensure the success of the transp ...

1, Experimental purpose Write an APP using LBS, which can display your current address (longitude and latitude, national, provincial and municipal streets) and display the movement of your position in real time. 2, Experimental content Develop a LBS APP with the following functions: 1. Development of LBS APP based on Baidu 2. Show your curre ...

catalogue How to upload files API related to file upload Realize file upload Realize file download 1, How to upload files To realize the file upload function in Web development, it usually needs to complete two steps: one is to add the upload input item in the Web page; the other is to read the data of the uploaded file in the Servlet and save ...

catalogue How to upload filesAPI related to file uploadRealize file uploadRealize file download 1, How to upload files To realize the file upload function in Web development, it usually needs to complete two steps: one is to add the upload input item in the Web page; the other is to read the data of the uploaded file in the Servlet and save ...

1 Notice: Undefined index: ZZZZZZWTF? [duplicate] When running the PHP script again, it is clear that there is no problem with the script syntax, but there are the following prompts: Notice: Undefined index: submit in C:\xampp\htdocs\globalautoparts\register.php on line 36 Notice: Undefined index: fullname in C:\xampp\htdocs\globalautoparts\r ...