Yuan-Kuei Hsueh phstudy

ambassador pattern用途

由於service consumer跟provider之間網路連結是透過hardcode的，因此service consumer要切換provider往往不太容易。若用ambassador來切換provider，只需重啟ambassador並連接至新的provider

關係由原本的 (consumer) -> (provider) 變成 (consumer) -> (ambassador) -> (provider)

想像一下，假如今天有n個consumers, 未使用ambassador，你需要重啟每個consumers。若使用ambassador，你只需要重啟一個ambassador。

	14:11:09 study-mbpr: Downloads$ ./darwin create -d azure --azure-publish-settings-file="Study Lab.-12-9-2014-credentials.publishsettings" --azure-password="------------" --azure-username="study" study-docker
	INFO[0000] Creating Azure host...
	INFO[0058] Waiting for SSH...
	INFO[0143] Waiting for docker daemon on host to be available...
	INFO[0194] "study-docker" has been created and is now the active machine. Docker commands will now run against that machine.

	14:14:55 study-mbpr: Downloads$ ./darwin ls
	NAME ACTIVE DRIVER STATE URL
	study-docker * azure Running tcp://docker-host-87211309ea05.cloudapp.net:4243

	+ Creating VM
	error: Windows Azure is currently performing an operation with x-ms-requestid c890872725eb3f6b8a763353e5a88296 on this deployment that requires exclusive access.
	info: Error information has been recorded to azure.err
	error: vm create command failed

	./attach-disk.sh rtb-cassandra88 tenmaxdb2 4 100

	import org.apache.commons.lang.StringUtils;
	import org.apache.spark.SparkConf;
	import org.apache.spark.api.java.JavaPairRDD;
	import org.apache.spark.api.java.JavaSparkContext;
	import scala.Tuple2;

	import java.util.Arrays;

	public class Spark720pStats {
	public static void main(String[] args) {

	FROM ubuntu:14.04
	MAINTAINER Study Hsueh "[email protected]"

	# Update Ubuntu
	RUN apt-get update

	# Install tomcat7
	RUN apt-get -y install tomcat7

	# Expose 8080 port

	# -- mode: ruby --
	# vi: set ft=ruby :

	# Vagrantfile API/syntax version. Don't touch unless you know what you're doing!
	VAGRANTFILE_API_VERSION = "2"

	Vagrant.configure(VAGRANTFILE_API_VERSION) do \|config\|
	config.vm.box = "dummy"
	config.ssh.pty = true

	task dockerPushImage(type: Exec, dependsOn: dockerBuildImage) {
	environment 'DOCKER_HOST', 'tcp://127.0.0.1:2375'

	commandLine "${project.dockercmd}", "push", "${project.dockerhub}/dmp-web:${dockerTagVer}"
	}

	sudo docker run --name rathena -e AWS=true --link rathena-mysql:mysql -p 6900:6900 -p 6121:6121 -p 5121:5121 -d 'study/rathena:latest'
	#sudo docker run --name rathena --link rathena-mysql:mysql --rm -it 'study/rathena:latest' /bin/bash