MAVEN_OPTS="-javaagent:/path/to/springloaded.jar -noverify" mvn tomcat:run
JdbcTemplate I dug a little into the sources of that class. At one point I saw that there's a named class (not an anonymous one) declared inside a method. WTF?public String getName(String user) {
JdbcTemplate template = new JdbcTemplate(this.datasource);
class NameExtractor implements ResultSetExtractor {
@Override
public String extractData(ResultSet rs)
throws SQLException, DataAccessException {
return rs.getString("firstName") + " " + rs.getString("lastName");
}
}
return template.query("SELECT * FROM users WHERE id=1", new NameExtractor());
} HashMap or Hashtable is implemented? Or maybe an ArrayList, ha? How about DynaBlasterRollerCoster? Do you care how it's doing what it's doing?Hash in Ruby and how does it compare to the inner workings of Dictionary in .NET?. Why not, right?<context:property-placeholder> tag configured as follows: <context:property-placeholder
system-properties-mode="OVERRIDE"
ignore-resource-not-found="true"
location="
classpath:defaults.properties,
file:${config.location:/etc/example.properties}" />
mvn tomcat7:run and have it running in minutes rather than to fiddle with all the moving parts of configuration.classpath there are the defaults in defaults.properties. Now the second part is interesting. First of all it makes an assumption that hosting will follow the best practices and store configuration where it belongs, which in almost all Linux distros is the /etc/ folder. Here's the trick though: some admins will cut your fingers an inch shorter if you force them to put anything anywhere. Especially for that occasion the second option is there to save the day. It allows you to specify a JVM parameter -Dconfig.location=... for Spring to look for configuration options in a completely different place. Neat, ain't it? Finally the system-properties-mode="OVERRIDE" allows for in-place overrides using JVM system variables (the ones specified with -Dvariable=value)Oct 28, 2012 5:14:09 PM org.apache.catalina.ha.deploy.FarmWarDeployer start
SEVERE: FarmWarDeployer can only work as host cluster subelement!server.xml as well). But let's start from the beginning.server.xml and it's commentsserver.xml that shows how to configure a cluster in Tomcat.
<!--For clustering, please take a look at documentation at:
/docs/cluster-howto.html (simple how to)
/docs/config/cluster.html (reference documentation) -->
<!-- <Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"/> -->SEVERE I mentioned before. Back to Google. And then some. Finally I arrived at this discussion where I learned that the <Cluster> element is supposed to be nested within the <Host> element and not where it was suggested by the original server.xml file. Go figure. Anyways, I moved the section down to the Host and this time Oct 28, 2012 5:01:34 PM org.apache.catalina.ha.deploy.FarmWarDeployer start
INFO: Cluster FarmWarDeployer started.hello.war into the /tmp/war-listen folder hoping to see Tomcat spring to work, install the application and make my day. But nothing happened!
The example in Tomcat documentation specifies watchEnable="false" by default. What was going through the mind of that someone who wrote it is beyond my understanding of the universe. Anyways, after I changed it to true finally something started to happen.Oct 28, 2012 5:29:36 PM org.apache.catalina.ha.deploy.FarmWarDeployer fileModified
INFO: Installing webapp [/hello] from [/tmp/war-deploy1/hello.war]
Oct 28, 2012 5:29:36 PM org.apache.catalina.ha.deploy.FarmWarDeployer remove
INFO: Cluster wide remove of web app [/hello]deployDir to where Tomcat expects to auto deploy applications (by default webapps, or rather ${catalina.base}/webapps). After I changed that, copied the Cluster configuration to the second Tomcat, started both and copied the hello.war application to /tmp/war-listen both Tomcats have received the proper nourishment and started talking my language../startup.sh but ./catalina.sh run. This way you'll have the console to view the logs and to terminate it all in case you're not happy with what you see. And last but not least: Google is your friend. I mean it. It is the one thing all this could not be possible without in terms of knowledge sharing.[](_link_)$PORT environment variable. As I started using Foreman recently this inconvenience became a stopper for me trying to start ActiveMQ, 2 instances of MongoDB in a shard and Neo4j with my Sinatra application. All was nice but the lack of ability to start MongoDB's control interface on separate ports blew it all out of the water.alpha: command_to_start -p1 $PORT -p2 $PORT0
beta: command_to_start -p1 $PORT1 -p3 $PORT9alpha would get assigned 2 ports: $PORT = 50xx and $PORT0 = 51xxbeta would get assigned 3 ports: $PORT = 52xx, $PORT1 = 53xx and $PORT9 = 54xxbeta still gets the $PORT assigned even though it is not used.:prefetch => 1 was the setting (as stated on some stackoverflow.com page) but setting it alone didn't do the trick because that made the channel get only one message and that was it. To continue receiving messages they have had to be ack'ed./WEB-INF/tags/hello.tagHello, world! from a tag/index.jsp<@ taglib prefix="tags" tagdir="/WEB-INF/tags" %>
<tags:hello />
class HomeController {
def index = {
[ message: "Hello, world!" ]
}db.example.update(
{ _id: ObjectId("5024d352ef2ff4c4a103db5f") },
{ $pull: { items: { $regex: /item/ } } }
)db.example.update({}, { $pull: { items: { $regex: /item/ } } }, false, true)alias method :)require 'memcached'
cache = Memcached.new "localhost:11211"
cache.set "message", "Hello, world!"
puts cache.get "message"get and set methods. Wouldn't it be nice to use the cache["message"] syntax?class Memcached
alias :"[]" :get
alias :"[]=" :set
endcache["message"] = "Hello"
puts cache["message"]memcached gem on my Ubuntu 12.04 box. Some error came out when installing native extensions:rlibmemcached_wrap.c: In function ‘Init_rlibmemcached’: rlibmemcached_wrap.c:13736:3: error: implicit declaration of function ‘sasl_client_init’ [-Werror=implicit-function-declaration] rlibmemcached_wrap.c:13736:33: error: ‘SASL_OK’ undeclared (first use in this function) cc1: some warnings being treated as errors make: *** [rlibmemcached_wrap.o] Error 1
libsasl2-dev package for this to work.HomeControllerclass HomeController {
def index() {
def date = new Date()
redirect uri: date.format("/yyyy/MM")
}
def page() {
def months = [ '', 'January', 'February', 'March', 'April', 'May', 'June',
'July', 'August', 'September', 'October', 'November', 'December' ]
[ year: params?.year, month: params?.month, months: months ]
}
}page.gsp:<!doctype html>
<html>
<head>
<title>Galery</title>
</head>
<body>
<ul>
<g:each in="${1..12}" var="i">
<li class="${i == month ? 'current' : ''}"><a href="/${year}/${i}">${months[i]}</a></li>
</g:each>
</ul>
</body>grails prod run-warab -n 1000 -c 10 http://localhost:8080/example/2012/03 up until the point when the figures became stable (usually between 20-30 executions with 5-10 seconds breaks in between).Server Software: Apache-Coyote/1.1
Server Hostname: localhost
Server Port: 8080
Document Path: /example139/2012/03
Document Length: 776 bytes
Concurrency Level: 10
Time taken for tests: 0.526 seconds
Complete requests: 1000
Failed requests: 0
Write errors: 0
Total transferred: 942000 bytes
HTML transferred: 776000 bytes
Requests per second: 1902.84 [#/sec] (mean)
Time per request: 5.255 [ms] (mean)
Time per request: 0.526 [ms] (mean, across all concurrent requests)
Transfer rate: 1750.47 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect: 0 0 0.1 0 2
Processing: 1 5 3.5 4 41
Waiting: 1 5 3.5 4 41
Total: 1 5 3.6 4 41
Percentage of the requests served within a certain time (ms)
50% 4
66% 6
75% 6
80% 7
90% 10
95% 12
98% 14
99% 17
100% 41 (longest request)
Server Software: Apache-Coyote/1.1
Server Hostname: localhost
Server Port: 8080
Document Path: /example204/2012/03
Document Length: 776 bytes
Concurrency Level: 10
Time taken for tests: 0.235 seconds
Complete requests: 1000
Failed requests: 0
Write errors: 0
Total transferred: 942000 bytes
HTML transferred: 776000 bytes
Requests per second: 4254.25 [#/sec] (mean)
Time per request: 2.351 [ms] (mean)
Time per request: 0.235 [ms] (mean, across all concurrent requests)
Transfer rate: 3913.58 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect: 0 0 0.3 0 5
Processing: 1 2 1.5 2 16
Waiting: 0 2 1.5 2 16
Total: 1 2 1.6 2 16
Percentage of the requests served within a certain time (ms)
50% 2
66% 2
75% 3
80% 3
90% 4
95% 5
98% 7
99% 10
100% 16 (longest request)Server Software: Apache-Coyote/1.1
Server Hostname: localhost
Server Port: 8080
Document Path: /example/2012/03
Document Length: 776 bytes
Concurrency Level: 10
Time taken for tests: 0.333 seconds
Complete requests: 1000
Failed requests: 0
Write errors: 0
Total transferred: 942000 bytes
HTML transferred: 776000 bytes
Requests per second: 3002.16 [#/sec] (mean)
Time per request: 3.331 [ms] (mean)
Time per request: 0.333 [ms] (mean, across all concurrent requests)
Transfer rate: 2761.76 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect: 0 0 0.2 0 3
Processing: 1 3 3.0 2 29
Waiting: 0 3 2.9 2 29
Total: 1 3 3.0 2 29
Percentage of the requests served within a certain time (ms)
50% 2
66% 3
75% 4
80% 4
90% 6
95% 9
98% 12
99% 17
100% 29 (longest request)
Unicorn with 4 workers (that's how many cores my notebook has)unicorn -E production -p 9393 -c config.rbconfig.rbworker_processes 4Server Software:
Server Hostname: localhost
Server Port: 9393
Document Path: /2012/03
Document Length: 728 bytes
Concurrency Level: 10
Time taken for tests: 1.109 seconds
Complete requests: 1000
Failed requests: 0
Write errors: 0
Non-2xx responses: 1000
Total transferred: 983000 bytes
HTML transferred: 728000 bytes
Requests per second: 901.84 [#/sec] (mean)
Time per request: 11.088 [ms] (mean)
Time per request: 1.109 [ms] (mean, across all concurrent requests)
Transfer rate: 865.73 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect: 0 0 0.0 0 0
Processing: 6 11 5.9 10 64
Waiting: 6 11 5.9 10 64
Total: 7 11 5.9 10 64
Percentage of the requests served within a certain time (ms)
50% 10
66% 11
75% 11
80% 12
90% 14
95% 15
98% 19
99% 55
100% 64 (longest request)require 'rubygems'
require 'sinatra'
require 'slim'
disable :logging
get '/' do
date = Time.now
redirect "/#{date.year}/#{date.month}"
end
get '/:year/:month' do
@current = Time.new(params[:year], params[:month])
@months = [ '', 'January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December' ]
slim :index
end
__END__
@@ index
doctype html
html
head
title Galery
body
ul
- (1..12).each do |month|
li class="#{@current.month == month ? "month current" : "month"}"
a href="/#{@current.year}/#{month}" #{@months[month]}sinatra with slim templating engine (my favorite!). We'll start the application the same way as the Rails app above.Server Software:
Server Hostname: localhost
Server Port: 9393
Document Path: /2012/03
Document Length: 709 bytes
Concurrency Level: 10
Time taken for tests: 0.449 seconds
Complete requests: 1000
Failed requests: 0
Write errors: 0
Total transferred: 922000 bytes
HTML transferred: 709000 bytes
Requests per second: 2227.71 [#/sec] (mean)
Time per request: 4.489 [ms] (mean)
Time per request: 0.449 [ms] (mean, across all concurrent requests)
Transfer rate: 2005.81 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect: 0 0 0.1 0 1
Processing: 1 4 2.8 4 29
Waiting: 0 4 2.8 4 29
Total: 1 4 2.8 4 29
Percentage of the requests served within a certain time (ms)
50% 4
66% 4
75% 5
80% 5
90% 6
95% 7
98% 12
99% 22
100% 29 (longest request)| Framework | Memory | Startup time |
|---|---|---|
| Grails 1.3.9 | 485.1MB | 21.95s user 0.76s system 109% cpu 20.656 total |
| Grails 2.0.4 | 699.3MB | 53.51s user 1.38s system 152% cpu 35.942 total |
| Grails 2.1.0 | 713.1MB | 30.19s user 1.30s system 106% cpu 29.609 total |
| Rails 3.2.6 | 169.8MB | 9.64s user 0.68s system 259% cpu 3.977 total |
| Sinatra on Unicorn | 82.1MB | 1.46s user 0.18s system 55% cpu 2.963 total |
@groovy.util.logging.Slf4j
class Test {
Test() { log.debug "Here" }
}Caught: BUG!apt-get install source-highlight~/.profile export LESSOPEN="| /usr/share/source-highlight/src-hilite-lesspipe.sh %s"
export LESS=' -R 'install.gsh that has 100+ lines is not hard. And since Groovy is a very expressive language those 100 lines are not making the compiler happy - it's actually stuff to be done.main method. The only difference is that they are automatically compiled when needed. This means we can use all the good Java stuff when writing Groovy scripts: classes, external libraries through @Grab annotation and so on.class Configuration {
String path
}#!/usr/bin/groovy
println new Configuration(path: "/tmp")package org.example
class Configuration {
String path
}#!/usr/bin/groovy
import org.example.Configuration
println new Configuration(path: "/tmp")hibernate.cache.region.factory_class. Unfortunately that doesn't work. See this bug report for more information.hibernate.cache.provider_class and everything should work as expected. Hibernate does all the adapter heavy lifting and life is good again :)company and a Candidate candidate if the company decides to hire candidate then the output is an Employee employee. This could be written down more/less like this:Employee employee = company.hire(candidate)class Candidate {
String firstName
String lastName
}class Company {
String name
def hiringService
Employee hire(Candidate candidate) {
return hiringService.hire(candidate)
}
}class Employee {
String firstName
String lastName
}Employee employee = company.hire(candidate)example.groovy file and execute it it'll actually run 2 unit tests. On the test we see the following sections:expect that a + b is equal to cJUnit 4 Runner, Tests: 2, Failures: 0, Time: 15@Parametrized tests (which sucks big time by the way).WebService: MySuperDuperWebService.makeHimPay(Double money)
REST : GET /person/54623445/account/1/balance (get the current balance)
PUT /person/54623445/account/1/balance + current balancegrails.doc.images = new File("src/docs/images")!my-image.png!grails create-app examplegrails-app/conf/BuildConfig.groovy's plugins file like this:plugins {
runtime ":hibernate:$grailsVersion"
runtime ":jquery:1.7.1"
runtime ":resources:1.1.5"
build ":tomcat:$grailsVersion"
compile ":kickstart-with-bootstrap:0.5"
}grails compile) for the build system to fetch all the plugins and do its other bits. After that we'll execute grails kickstart-with-bootstrap (the one that just came about with the kickstart-with-bootstrap plugin), answer all questions positive and we're done. At this point you can create a domain class and a controller but that's not really the point of this blog. The point here is to pick on the way the master kickstart layout looks like.grails-app/views/layouts/kickstart.gsp. Here are a few points I'd like to make:<%-- <div class="container">--%> <g:if test="${ params.controller != null
&& params.controller != ''
&& params.controller != 'home'
&& params.controller != 'login'
}">So a list should be shown, right? Or maybe we're actually creating an entity... Hm,... What was going through the author's mind at this point???class="${ params.action == "list" ? 'active' : '' }" class="${ params.action == "create" ? 'active' : '' }"
grails-app/conf/BuildConfig.groovy like this:grails-app/domain/Person.groovy:grails-app/ratpack and inside of it a file called PersonRatpack.groovy:Config.groovy:grails-app/ratpack/templates/list.html:grails-app/conf/BootStrap.groovy file like this:$.post() doesn't do the trick...$.ajax() method, not the $.post() one. Secondly you need to specify the contentType parameter for the receiver to be notified that the data is in that format. And last but not least it is crucial to properly serialize your object to string.JSON.stringify() but writing this over and over again is painful. Here's a gist (raw) you can use that adds a sister version of $.post called $.postJSON that does exactly the same thing as the original one but sends data in JSON format instead of form post.