repl

1. Official feature222:jshell:the Java Shell (read-eval-print Loop)2. Creating a backgroundLanguages such as Python and Scala have long had an interactive programming environment REPL (READ-EVALUATE-PRINT-LOOP), which evaluates statements and expressions in an interactive manner. Developers only need to enter some code, they can get feedback on the program before compiling. For the previous Java version to execute the code, you must create the file, d

Repl (read eval print loop) is a very useful tool that allows us to runCodeThe result is displayed. Although this is not worth mentioning compared to the firebug console, it is useful when providing a demonstration in a personal blog. Below is all its code, including HTML.

How to handle swift REPL exceptions on Mac terminals and swift trepl on mac TerminalsHow to handle swift REPL exceptions on Mac Terminals The terminal uses the swift command Warning: Swift error in module libmarisa. dylibDebug info from this module wi... Solution First, convert the Directory Sudo xcode-select-s/apps/Xcode-beta.app/Contents/Developer Run xcrun swift or swift again. HuangjiamingdeMac

1, save all REPL process in Emacs c-x c-w file as SaveThe execution statement is not correctly parsed by (load "Foo.lisp") because only the definition statement can execute correctly (load "Foo.lisp")So the script was written like this, the parse_lisp_code.sh.#!/bin/bashIf [-N "$"]; ThenSed ' s/cl-user>//' | Expand-t 8 | Egrep ' ^ *\ (def|^ {8,} ' >> ' Code_${1} 'Elseecho "Please input Lisp file name"FiRun the script sh parse_lisp_code.sh cd.lispComma

： --databases; 总结： mysqldump+binlog lvm2+cp/tar+binlog xtrabackup(innodb)+binlogExperiment "MySQL master-slave replication Architecture and advanced":MySQL dual master (master-master) + semi-sync (semisync Replication)First, the environmentHost name host IPMysqla 172.18.252.221MYSQB 172.18.252.222Operating system: CentOS 6.5 2.6.32-431.el6.x86_64MySQL version mysql-community-server-5.7.5-0.6.m15.el6.x86_64Second,

to add success, all stop, each node executes db.shutdownserver (); Then add the following two lines to the mongod.conf file: Auth=true Keyfile=/mnt/mongodb/rs/confile/mongodb-keyfile All the last reboots!Enter the main node terminalDb.runcommand ({getlasterror:1, w:n}); if not n 2 N equals 2 n local.slaves when specified "W" option, you can also use " Wtimeout " getlasterror can be copied to N ( The command is not timed out by default ) Blocking replication can

[initandlisten] git version:6201872043ecbbc0a4cc169b5482dcf385fc464f 2015-05-18T09 : 51:12.163+0800 I CONTROL [Initandlisten] OpenSSL version:openssl 1.0.1e-fips 2015-05-18t09:51:12.163+0800 I CONTROL [Initandlisten] Build info:linux ip-10-169-109-10 3.10.0-121.el7.x86_64 #1 SMP Tue Apr 8 10:48:19 EDT 2 014 x86_64 boost_lib_version=1_49 2015-05-18t09:51:12.163+0800 I CONTROL [Initandlisten] Allocator:tcmalloc 2015-05-18t09:51:12.163+0800 I CONTROL [Initandlisten] Options: {master:true, net: {po

MongoDB replica set (2) Construction Preparations Environment: CentOS6.5 64-bit MongoDB 3.0.1 64-bit 1. Start the mongod Service [Root @ localhost data] #/usr/local/mongodb3.0.1/bin/mongod -- port 40144 -- dbpath =/data/mongodb3.0.1/data/-- logpath =/data/mongodb3.0.1/log/ mongodb. log -- directoryperdb -- maxConns 100 -- logappend -- replSet repl/192.168.66.89: 50144 -- fork [Root @ localhost data] #/usr/local/mongodb3.0.1/bin/mongod -- port 50144

-1.2.6[Email protected] slony1-1.2.6]#/configure--with-pgsourcetree=/usr/local/pgsql/bin[[email protected] slony1-1.2.6]# makeAll of Slony-i is successfully made. Ready to install[[email protected] slony1-1.2.6]# make installAll of Slony-i is successfully installed===================================================================================Install the Slony in the main library from the library, install the same way============================================================================

:= regexp.MustCompile(`Hello\w+`)fmt.Println(reg.MatchReader(r))// falser.Seek(0, 0)reg = regexp.MustCompile(`Hello[\w\s]+`)fmt.Println(reg.MatchReader(r))// true} // 判断在 s 中能否找到匹配项func (re *Regexp) MatchString(s string) bool func main() {s := `Hello World`reg := regexp.MustCompile(`Hello\w+`)fmt.Println(reg.MatchString(s))// falsereg = regexp.MustCompile(`Hello[\w\s]+`)fmt.Println(reg.MatchString(s))// true} // 统计正则表达式中的分组个数（不包括“非捕获的分组”）func (re *Regexp) NumSubexp() int func main() {reg := reg

: { port: 10001 }, slave: true, source: "localhost:10000", storage: { dbPath: "/home/jifeng/mongodb-linux-x86_64-2.6.4/data2" } } 2014-09-05T15:12:48.417+0800 [initandlisten] journal dir=/home/jifeng/mongodb-linux-x86_64-2.6.4/data2/journal 2014-09-05T15:12:48.417+0800 [initandlisten] recover : no journal files present, no recovery needed 2014-09-05T15:12:48.434+0800 [initandlisten] waiting for connections on port 10001 2014-09-05T15:12:49.438+0800 [replslave]

default value of the parameter is 0, which means no limit is imposed. Hard limit: When the buffer volume reaches the hard limit, redis immediately disconnects from the client.Soft limit and soft seconds: When the buffer exceeds soft limit within soft seconds, redis will not close the client connection. If the buffer still exceeds the soft limit after soft seconds, redis immediately closes the client connection. 2. repl-timeoutThe

into a backslash in the regular expression. The native string in Python solves this problem well. In this example, the regular expression can be represented by r. Similarly, "\ d" matching a number can be written as r "\ d ". With the native string, mom doesn't have to worry about missing the backslash, and the written expression is more intuitive. 4. Python Re Module Python comes with the re module, which provides support for regular expressions. The main methods used are as follows: 1 # retu

Java 9 is faster: JShell hands-on practice HowIs it one of the coolest features of Java 9? Last week, I finally took the time to experience a preemptive version of Java 9. The first stop is JShell, which is also called the Kulla project. This is why at first I had the courage to try Java 9 first. That's right. The official Java 9 release date is currently set to September 2016, but the first trial version has a full-function JShell. New article: Java 9 faster: JShell programming practices --

MySQL dual-master-slave configuration bitsCN.com 1) two mysql servers A and B1. edit/etc/my. cnf for server parameters [Server A]Server-id = 1Binlog-do-db = testBinlog-ignore-db = mysqlReplicate-do-db = testReplicate-ignore-db = mysqlMaster-host = 192.168.20.195Master-user = replMaster-password = replMaster-port = 3306Master-connect-retry = 10Sync-binlog = 1Log-bin = mysql-bin [Server B]Server-id = 2Binlog-do-db = testBinlog-ignore-db = mysqlReplicate-do-db = testReplicate-ignore-db = mysqlMaste

1) Two mysql servers A and B1. edit/etc/my. cnf for server Parameters [Server A]Server-id = 1Binlog-do-db = testBinlog-ignore-db = mysqlReplicate-do-db = testReplicate-ignore-db = mysqlMaster-host = 192.168.20.195Master-user = replMaster-password = replMaster-port = 3306Master-connect-retry = 10Sync-binlog = 1Log-bin = mysql-bin [Server B]Server-id = 2Binlog-do-db = testBinlog-ignore-db = mysqlReplicate-do-db = testReplicate-ignore-db = mysqlMaster-host = 192.168.20.194Master-user = replMaster-p

MYSQL master-slave synchronization configuration for CentOS 1. Both the master and salver close the firewall iptables and execute the service iptables stop command: Set SELINUX = disabled for The SELINUX file ,: 2. Create a database Log on to mysql on the master and slave respectively: mysql-u root-p Create database repl; Create the log profile/usr/local/mysql/mysql-bin.log for MYSQL replication in the/usr/local/mysql directory and grant permissions

, operating system versions, disk I/O disk capacity, and network bandwidth. [Root @ data02 ~] # Cat/etc/redhat-release CentOS release 6.2 (Final) [Root @ data02 ~] # Master database master Slave OS version CentOS release 6.2 (Final) CentOS release 6.2 (Final) Database Version 5.6.12-log 5.6.12-log Disk capacity 50 GB 30G Host IP Address 192.168.52.129 192.168.52.130 Port 3306 3306 Memory 1G

data in the console. At the same time, you want to read the output stack data in order from top to bottom.function C () { console.log (' C '); function B () { console.log (' B '); C ();} function A () { console.log (' a '); b ();} A ();Running the above code in Node's REPL mode will give you the following output:Trace at C (repl:3:9) at B (repl:

flow is then returned to B, and b execution is also removed from the top of the stack, and the final control flow is returned to a, the last A is completed, and a is removed from the stack. We can use Console.trace () to better demonstrate this behavior, and it will print out records from the current stack on the console. In addition, you should generally read stack records from top to bottom. Think about where each of the following lines of code is invoked. Function C () {Console.log (' C ');