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Dynamic Configuration Properties in Spring Boot and Spring Cloud

TL;DR

• Use @ConfigurationProperties and always get state from the bean.
• The Environment can change at runtime and Spring Cloud does this for you using RefreshEvent.
• Changes are propagated to beans in Spring Cloud in 2 ways (@ConfigurationProperties and @RefreshScope).
• If you care about the state of @ConfigurationProperties being consistent on concurrent access, put it or the consumer @Bean in @RefreshScope.

Typical Scenarios

dantesun

from twisted.internet import reactor, defer, endpoints, task, stdio
from twisted.conch.client import default, options, direct
from twisted.conch.error import ConchError
from twisted.conch.ssh import session, forwarding, channel
from twisted.conch.ssh import connection, common
from twisted.python import log, usage
import signal
import tty
import struct
import fcntl

dantesun

#Collecting all physical interfaces's name and mac addresse
declare -A NAME_TO_MAC
set -e
for f in /sys/class/net/*; do
  if [ -L $f ]; then
    name=`readlink $f`
    if echo $name | grep -v 'devices/virtual' > /dev/null; then
      eval $(ifconfig `basename $f` | head -n 1 | awk '{print "NAME_TO_MAC[\"",$1,"\"]=",$5}' | tr -d ' ')
    fi
  fi

dantesun

#!/bin/bash                                                                                                                                                                     
DIR="$PWD"
GIT="/usr/bin/git"
 
echo "Generating tags in $DIR"
 
FILE_LIST=cscope.files
TAG_FILE=tags
if ! [ -d .git ]; then
  echo "create Git repository"

dantesun

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