properties

Kafka mirror实践

由 筅森魡賤 提交于 2020-01-10 08:09:06
mirror功能介绍可查看其他资源，本次只介绍实际部署案例，hostA和hostB上分别有两套单节点kafka集群，配置数据由hostA的topic同步至hostB的topic 1.配置两边的/etc/hosts，互通 2.在hostA节点创建mirror-consumer.properties mirror-producer.properties mirror-consumer.properties内容： bootstrap.servers=hostA:9092 group.id=mirror mirror-producer.properties内容： bootstrap.servers=hostB:9092 3.在hostB节点创建相同mirror-consumer.properties mirror-producer.properties文件 4.在hostA和hostB Kafka集群中都存在topic test_demo 5.在hostA启动mirror maker kafka-mirror-maker.sh --consumer.config ~/mirror-consumer.properties --producer.config ~/mirror-producer.properties --whitelist "test_demo" 5

Execute a method when a variable value changes in Swift

由 爷，独闯天下 提交于 2020-01-10 08:04:18
问题 I need to execute a function when a variable value changes. I have a singleton class containing a shared variable called labelChange . Values of this variable are taken from another class called Model . I have two VC classes, one of them has a button and a label and the second only a button. When the button in the first VC class is pressed I am updating the label with this func: func updateLabel(){ self.label.text = SharingManager.sharedInstance.labelChange } But I want to call the same

Preferred way of defining properties in Python: property decorator or lambda?

由 那年仲夏 提交于 2020-01-10 07:39:08
问题 Which is the preferred way of defining class properties in Python and why? Is it Ok to use both in one class? @property def total(self): return self.field_1 + self.field_2 or total = property(lambda self: self.field_1 + self.field_2) 回答1: The decorator form is probably best in the case you've shown, where you want to turn the method into a read-only property. The second case is better when you want to provide a setter/deleter/docstring as well as the getter or if you want to add a property

Load environment-specific properties for use with PropertyPlaceholderConfigurer?

由 余生颓废 提交于 2020-01-10 06:55:12
问题 This seems like a pretty common problem, but I haven't found any sort of consensus on the best method, so I'm posing the question here. I'm working on a command-line Java application using Spring Batch and Spring. I'm using a properties file along with a PropertyPlaceholderConfigurer, but I'm a little unsure of the best way of handling the properties files for multiple environments (dev, test, etc.). My Googling is only turning up programmatic ways of loading the properties (i.e., in the Java

How do you iterate through current class properties (not inherited from a parent or abstract class)?

由 自作多情 提交于 2020-01-10 04:12:44
问题 I know that PHP5 will let you iterate through a class's properties. However, if the class extends another class, then it will include all of those properties declared in the parent class as well. That's fine and all, no complaints. However, I always understood SELF as a pointer to the current class, while $this also points to the current object (including stuff inherited from a parent) Is there any way I can iterate ONLY through the current class's properties. Reason why I'm asking this.... I

Filtering out auto-generated methods (getter/setter/add/remove/.etc) returned by Type.GetMethods()

由 一笑奈何 提交于 2020-01-10 03:31:29
问题 I use Type.GetMethods(BindingFlags.Instance | BindingFlags.Static | BindingFlags.Public | BindingFlags.NonPublic) to retrieve an array of methods for a given type. The problem is the returned MethodInfo could include methods that are generated by the compiler which I don't want. For example: property bool Enabled { get; } will get bool get_Enabled() event SomethingChanged will get add_SomethingChanged(EventHandler) and remove_SomethingChanged(EventHandler) I can probably add some filter logic

Are Java Properties effectively deprecated?

由 ￣綄美尐妖づ 提交于 2020-01-10 02:27:09
问题 Java's Properties object hasn't changed much since pre-Java 5, and it hasn't got Generics support, or very useful helper methods (defined pattern to plug in classes to process properties or help to load all properties files in a directory, for example). Has development of Properties stopped? If so, what's the current best practice for this kind of properties saving/loading? Or have I completely missed something? 回答1: A lot of the concepts around Properties are definitely ancient and

Spring Boot 配置文件

由 寵の児 提交于 2020-01-10 00:58:00
Spring Boot 配置文件 一 配置文件类型 Spring Boot默认支持properties和yml两种格式的配置文件。yml格式是天然的树状接口，相对于properties，yml更加的一目了然。这也是我们推荐的配置文件格式。 properties 格式举例 server.port=8090 server.session-timeout=30 server.tomcat.max-threads=0 server.tomcat.uri-encoding=UTF-8 spring.datasource.url=jdbc:mysql://localhost:3306/newbirds spring.datasource.username=root spring.datasource.password=mymysql spring.datasource.driverClassName=com.mysql.jdbc.Driver spring.jpa.database=MYSQL spring.jpa.show-sql=true spring.jpa.hibernate.ddl-auto=update spring.jpa.hibernate.naming-strategy=org.hibernate.cfg.ImprovedNamingStrategy spring.jpa

springBoot starter原理

由 半腔热情 提交于 2020-01-09 20:13:43
【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 通常搭建一个基于spring的web应用，我们需要做以下工作： pom文件中引入相关的jar包，包括spring、spring mvc、redis、mybatis、log4j、mysql-connector-java等相关的jar 配置web.xml，listenter配置、Filter配置、Servlet配置、log4j配置、error配置 配置数据库连接、配置spring事务 配置视图解析器 开启注解、自动扫描功能 配置完成后部署tomcat、启动调试 springBoot拥有很多方便使用的starter，spring提供的stater命名规范spring-boot-stater-xxx.jar,第三方提供的starter命名规范xxx-spring-boot-stater.jar。比如spring-boot-starter-log4j、mybatis-spring-boot-starter.jar等，各自代表了一个相对完整的功能模块。 以mybatis-spring-boot-starter为例，我们分析一下starter做了哪些操作 可以看到在mybatis-spring-boot-starter中，并没有任何的源码，只有一个pom文件，它的作用就是帮我们引入mybatis-spring-boot

java 数据库连接池

由 不问归期 提交于 2020-01-09 12:32:50
1. About java利用jdbc直接连接数据库，经常取得连接，用完释放，很浪费系统资源 2. Code Java代码 package com.cdv.mam.db; import java.sql.Connection; import java.sql.DatabaseMetaData; import java.sql.SQLException; import java.util.Properties; import javax.sql.DataSource; import org.apache.commons.dbcp.BasicDataSourceFactory; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; //import org.apache.tomcat.dbcp.dbcp.BasicDataSourceFactory; /** * tomcat数据库连接池管理类<br> * 使用为tomcat部署环境<br> * 需要在类路径下准备数据库连接配置文件dbcp.properties * */ public class DBManager { private static final Log log = LogFactory.getLog
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