The example explains how Ruby uses the decorator mode in the design mode, and the ruby design mode.
OverviewIf you are engaged in object-oriented development, adding behavior to a class or object and using inheritance mechanisms, this is a basic feature of all object-oriented languages. If an existing class lacks some methods, or you need to add more functions (CHARM) to the method ), you may just inherit t
Solve ruby Installation Problems: redis requires Ruby version amp, rubyredis
I. Problem Description
Today, we set up a redis cluster and encountered a problem when installing ruby and redis interface programs: redis requires Ruby version> = 2.2.2., as shown below:
[root@localhost ~]# gem install redis-4.0.0.gem ERROR
If you read Kafka for the first time, read the distributed message system Kafka preliminary
Some people have asked the difference between Kafka and general MQ, which is difficult to answer. I think it is better to analyze the implementation principles of Kafka, based on the design provided on the official website, this
Kafka 0.9 version of the Java Client API made a large adjustment, this article mainly summarizes the Kafka 0.9 in the cluster construction, high availability, the new API related processes and details, as well as I in the installation and commissioning process to step out of the various pits.About Kafka structure, function, characteristics, application scenarios,
Stop Kafka service:kafka_2.12-0.10.2.1> bin/kafka-server-stop.shkafka_2.12-0.10.2.1> bin/ Zookeeper-server-stop.shstep 1: Download Kafka download the latest version and unzip .>Tar-xzf kafka_2.12-0.10.2.1.tgz> CD Kafka_2.12-0.10.2.1step 2: Start the service Kafka used to zookeeper, all first start Zookper, the followin
Example of how to optimize Ruby code to speed up the program running, ruby speed
This article mainly introduces how to increase ruby gem contracts. ruby speed by 10 times.
Contracts. ruby is used in my project to add code contracts to Ru
How to learn ruby at high speed ? The quickest way to learn a language.variables, constants, variable types, operators.Logical statements such as if, else, switch, for, foreach, does while, break, and so on. What languages do you want to learn? What are the commands that are similar to these commands? Know how to use it. Then, assuming object-oriented, you need to understand the object's operation.There is no library of functions. The general language
Installing Ruby with Upgrade RubyGemstip: If you are prompted for permission issues during the installation process in the Ubuntu environment, you can use sudo make and sudo makes install.
1.Ruby Installation
wget http://ftp.ruby-lang.org/pub/ruby/1.9/ruby-1.9.3-p125.tar.gz \
TAR-XZVF
Title: Custom Log4j2 send log to KafkaTags:log4j2,kafka
In
order to provide the company's big data platform each project group's log, but also makes each project group to change not to perceive. Did a survey only to find LOG4J2 default has the support to send the log to the Kafka function, under the surprise hurriedly looked under log4j to its realization source! found that the default implementa
Kafka Cluster build Step 1.
Machine preparation In this article, we will prepare three machines to build Kafka cluster, IP address is 192.168.1.1,192.168.1.2,192.168.1.3, and three machines network interoperability. 2. Download and install kafka_2.10-0.8.2.1 download address: https://kafka.apache.org/downloads.html download completed, upload to the target machine, such as 192.168.1.1, use the following com
Environmental Preparedness
Create topic
command-line mode
implementation of producer consumer examples
Client Mode
Run consumer producers
1. Environmental Preparedness
Description: Kafka cluster environment I am lazy to use the company's existing environment directly. Security, all operations are done under their own users, if their own Kafka environment, fully can use the
I just spent 3 hours last night reading the Journal: a unified concept of real-time data that every software engineer should know about.Today, Kafka is running in a Docker container, several on GitHub, but it's all too complicated.I'll write the simplest Python demo experience for you: Https://github.com/xuqinghan/docker-kafkaCompared with the deployment of Taiga last week, Kafka is worthy of everyone's han
Ruby uses the simple factory mode and factory method mode in the design mode, and the ruby Design Mode
I have read the ruby design pattern before, But I gradually forget it. Now I bought a big talk design pattern, which doesn't look so boring. By the way, I implemented the code in ruby.
Simple factory mode:
#-*-Encodin
It's pretty rare I recommend new blogs to follow on Ruby inside. Not because I don't like them-I link to their posts all the time!-But because it's hard to tell if a new blog is going to keep going and be worth your while. Well, the Ruby community has a new blog in its midst that's proving to be a must-read-Ruby Best Practices.It's a must-subscribe (RSS feed) fo
What is Ruby FPDF?
Ruby FPDF is a Ruby portOlivier Plathey's excellent PDF generator,FPDF.FPDF is written in PHP, and as such can only be used from PHP scripts.Ruby FPDF, as the name suggests, is written in Ruby and can be usedFrom Ruby scripts.
1. OverviewIn the Kafka combat-real-time log statistics process, we talked about storm issues, and we need to use storm to consume data from Kafka cluster when we're done with real-time log statistics, so I'll share a storm with you here alone. Cluster to build and deploy. Here's a list of today's shares:
Storm Brief
Basic software
Installation deployment
Effect Preview
Let's start
Kafka is a high-throughput distributed publish-subscribe messaging system that handles all the action flow data in a consumer-scale website. You can also think of it as a publish-subscribe message for distributed commit logs, in fact the Kafka official web site explains it. A few key terms you need to know about KAFKTopics:kafka receive a variety of messagesProducers: Send Message to KafkaConsumers: Subscr
Quick StartThis tutorial assumes is starting fresh and has no existing Kafka or ZooKeeper data. Step 1:download The CodeDownload the 0.8.2.0 release and Un-tar it. > Tar-xzf kafka_2.10-0.8.2.0.tgz> CD kafka_2.10-0.8.2.0 Step 2:start the serverKafka uses ZooKeeper so, need to first start a ZooKeeper the server if you do not already have one. You can use the convenience script packaged with Kafka to get a qui
Environment Preparation
Create topic
command-line mode
executing producer consumer instances
Client Mode
Run consumer producers
1. Environmental Preparedness
Description: Kafka Clustered Environment I'm lazy. Direct use of the company's existing environment. Security, all operations are done under their own users, if their own Kafka environment, can fully use the
I've been working on Ruby for a while and have recently had some leisure events, learning about Ruby and preparing for future Ruby on Rails development.Ruby was founded in 1993 by as of Japan (まつもとゆきひろ/yukihiro Matsumoto). In contrast to chatty's development language such as Java, Ruby can be said to be small and beaut
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