问题
Steps to replicate:
- Create a new Rails project. (rails 3.2.22.5)
- Add dependencies (warbler, rake, rufus-scheduler) (/Gemfile)
- JRuby 9.1.7.0
- Create new files. (/config/warble.rb) (/web.xml.erb) (/config/intializers/scheduler_rufus.rb)
- Create an executable war file with jetty webserver. (warble war RAILS_ENV=development)
- Launch the executable. (java -jar mywar.war)
- The scheduler runs the job 2 times.
/Gemfile:
source 'https://rubygems.org'
gem 'rails', '3.2.22.5'
# Bundle edge Rails instead:
# gem 'rails', :git => 'git://github.com/rails/rails.git'
gem 'activerecord-jdbcsqlite3-adapter'
gem 'jruby-openssl'
gem 'warbler'
gem 'rake', '11.3.0'
gem 'rufus-scheduler', '~> 3.3', '>= 3.3.3'
# Gems used only for assets and not required
# in production environments by default.
group :assets do
gem 'sass-rails', '~> 3.2.3'
gem 'coffee-rails', '~> 3.2.1'
# See https://github.com/sstephenson/execjs#readme for more supported runtimes
gem 'therubyrhino'
gem 'uglifier', '>= 1.0.3'
end
gem 'jquery-rails'
# To use ActiveModel has_secure_password
# gem 'bcrypt-ruby', '~> 3.0.0'
# To use Jbuilder templates for JSON
# gem 'jbuilder'
# Use unicorn as the app server
# gem 'unicorn'
# Deploy with Capistrano
# gem 'capistrano'
# To use debugger
# gem 'debugger'
/config/warble.rb
# Disable Rake-environment-task framework detection by uncommenting/setting to false
# Warbler.framework_detection = false
# Warbler web application assembly configuration file
Warbler::Config.new do |config|
# Features: additional options controlling how the jar is built.
# Currently the following features are supported:
# - *gemjar*: package the gem repository in a jar file in WEB-INF/lib
# - *executable*: embed a web server and make the war executable
# - *runnable*: allows to run bin scripts e.g. `java -jar my.war -S rake -T`
# - *compiled*: compile .rb files to .class files
config.features = %w(executable)
# Application directories to be included in the webapp.
config.dirs = %w(app config db lib log script vendor tmp)
# Additional files/directories to include, above those in config.dirs
config.includes = FileList["web.xml.erb"]
# Additional files/directories to exclude
# config.excludes = FileList["lib/tasks/*"]
# Additional Java .jar files to include. Note that if .jar files are placed
# in lib (and not otherwise excluded) then they need not be mentioned here.
# JRuby and JRuby-Rack are pre-loaded in this list. Be sure to include your
# own versions if you directly set the value
# config.java_libs += FileList["lib/java/*.jar"]
# Loose Java classes and miscellaneous files to be included.
# config.java_classes = FileList["target/classes/**.*"]
# One or more pathmaps defining how the java classes should be copied into
# the archive. The example pathmap below accompanies the java_classes
# configuration above. See http://rake.rubyforge.org/classes/String.html#M000017
# for details of how to specify a pathmap.
# config.pathmaps.java_classes << "%{target/classes/,}p"
# Bundler support is built-in. If Warbler finds a Gemfile in the
# project directory, it will be used to collect the gems to bundle
# in your application. If you wish to explicitly disable this
# functionality, uncomment here.
# config.bundler = false
# An array of Bundler groups to avoid including in the war file.
# Defaults to ["development", "test", "assets"].
# config.bundle_without = []
# Other gems to be included. If you don't use Bundler or a gemspec
# file, you need to tell Warbler which gems your application needs
# so that they can be packaged in the archive.
# For Rails applications, the Rails gems are included by default
# unless the vendor/rails directory is present.
# config.gems += ["activerecord-jdbcmysql-adapter", "jruby-openssl"]
# config.gems << "tzinfo"
# Uncomment this if you don't want to package rails gem.
# config.gems -= ["rails"]
# The most recent versions of gems are used.
# You can specify versions of gems by using a hash assignment:
# config.gems["rails"] = "4.2.5"
# You can also use regexps or Gem::Dependency objects for flexibility or
# finer-grained control.
# config.gems << /^sinatra-/
# config.gems << Gem::Dependency.new("sinatra", "= 1.4.7")
# Include gem dependencies not mentioned specifically. Default is
# true, uncomment to turn off.
# config.gem_dependencies = false
# Array of regular expressions matching relative paths in gems to be
# excluded from the war. Defaults to empty, but you can set it like
# below, which excludes test files.
# config.gem_excludes = [/^(test|spec)\//]
# Pathmaps for controlling how application files are copied into the archive
# config.pathmaps.application = ["WEB-INF/%p"]
# Name of the archive (without the extension). Defaults to the basename
# of the project directory.
config.jar_name = "mywar"
# File extension for the archive. Defaults to either 'jar' or 'war'.
config.jar_extension = "war"
# Destionation for the created archive. Defaults to project's root directory.
# config.autodeploy_dir = "dist/"
# Name of the MANIFEST.MF template for the war file. Defaults to a simple
# MANIFEST.MF that contains the version of Warbler used to create the war file.
# config.manifest_file = "config/MANIFEST.MF"
# When using the 'compiled' feature and specified, only these Ruby
# files will be compiled. Default is to compile all \.rb files in
# the application.
# config.compiled_ruby_files = FileList['app/**/*.rb']
# Determines if ruby files in supporting gems will be compiled.
# Ignored unless compile feature is used.
# config.compile_gems = false
# When set it specify the bytecode version for compiled class files
# config.bytecode_version = "1.6"
# When set to true, Warbler will override the value of ENV['GEM_HOME'] even it
# has already been set. When set to false it will use any existing value of
# GEM_HOME if it is set.
# config.override_gem_home = true
# Allows for specifing custom executables
# config.executable = ["rake", "bin/rake"]
# Sets default (prefixed) parameters for the executables
# config.executable_params = "do:something"
# If set to true, moves jar files into WEB-INF/lib. Prior to version 1.4.2 of Warbler this was done
# by default. But since 1.4.2 this config defaults to false. It may need to be set to true for
# web servers that do not explode the WAR file.
# Alternatively, this option can be set to a regular expression, which will
# act as a jar selector -- only jar files that match the pattern will be
# included in the archive.
# config.move_jars_to_webinf_lib = false
# === War files only below here ===
# Embedded webserver to use with the 'executable' feature. Currently supported
# webservers are:
# - *jetty* - Embedded Jetty from Eclipse
config.webserver = 'jetty'
# Path to the pre-bundled gem directory inside the war file. Default
# is 'WEB-INF/gems'. Specify path if gems are already bundled
# before running Warbler. This also sets 'gem.path' inside web.xml.
# config.gem_path = "WEB-INF/vendor/bundler_gems"
# Files for WEB-INF directory (next to web.xml). This contains
# web.xml by default. If there is an .erb-File it will be processed
# with webxml-config. You may want to exclude this file via
# config.excludes.
# config.webinf_files += FileList["jboss-web.xml"]
# Files to be included in the root of the webapp. Note that files in public
# will have the leading 'public/' part of the path stripped during staging.
# config.public_html = FileList["public/**/*", "doc/**/*"]
# Pathmaps for controlling how public HTML files are copied into the .war
# config.pathmaps.public_html = ["%{public/,}p"]
# Value of RAILS_ENV for the webapp -- default as shown below
config.webxml.rails.env = ENV['RAILS_ENV'] || 'production'
# Public ROOT mapping, by default assets are copied into .war ROOT directory.
# config.public.root = ''
# Application booter to use, either :rack or :rails (autodetected by default)
# config.webxml.booter = :rails
# When using the :rack booter, "Rackup" script to use.
# - For 'rackup.path', the value points to the location of the rackup
# script in the web archive file. You need to make sure this file
# gets included in the war, possibly by adding it to config.includes
# or config.webinf_files above.
# - For 'rackup', the rackup script you provide as an inline string
# is simply embedded in web.xml.
# The script is evaluated in a Rack::Builder to load the application.
# Examples:
# config.webxml.rackup.path = 'WEB-INF/hello.ru'
# config.webxml.rackup = %{require './lib/demo'; run Rack::Adapter::Camping.new(Demo)}
# config.webxml.rackup = require 'cgi' && CGI::escapeHTML(File.read("config.ru"))
# Control the pool of Rails runtimes. Leaving unspecified means
# the pool will grow as needed to service requests. It is recommended
# that you fix these values when running a production server!
# If you're using threadsafe! mode, you probably don't want to set these values,
# since 1 runtime(default for threadsafe mode) will be enough.
config.webxml.jruby.min.runtimes = 2
config.webxml.jruby.max.runtimes = 4
# JNDI data source name
# config.webxml.jndi = 'jdbc/rails'
end
/web.xml.erb
<web-app xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
version="3.0">
<!--
<display-name>Uncomment and put name :here: for Tomcat Dashboard</display-name>-->
<%# NOTE: to be renamed to servlet_context_params %>
<%- webxml.context_params.each do |name, value| -%>
<context-param>
<param-name><%= name %></param-name>
<param-value><%= value %></param-value>
</context-param>
<%- end -%>
<%- if webxml.respond_to?(:servlet_filter) -%>
<filter>
<filter-name><%= webxml.servlet_filter_name %></filter-name>
<filter-class><%= webxml.servlet_filter %></filter-class>
<async-supported><%= !! webxml.servlet_filter_async %></async-supported>
</filter>
<filter-mapping>
<filter-name><%= webxml.servlet_filter_name %></filter-name>
<url-pattern><%= webxml.servlet_filter_url_pattern %></url-pattern>
</filter-mapping>
<%- else -%> <%# NOTE: due compatibility when warbler gets downgraded to 2.0.0 %>
<filter>
<filter-name>RackFilter</filter-name>
<filter-class>org.jruby.rack.RackFilter</filter-class>
<async-supported>true</async-supported>
</filter>
<filter-mapping>
<filter-name>RackFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<%- end -%>
<%- if webxml.respond_to?(:servlet_context_listeners) -%>
<%- webxml.servlet_context_listeners.each do |listener| -%>
<listener>
<listener-class><%= listener %></listener-class>
</listener>
<%- end -%>
<%- else -%> <%# NOTE: due compatibility when warbler gets downgraded to 2.0.0 %>
<listener>
<listener-class><%= webxml.servlet_context_listener %></listener-class>
</listener>
<%- end -%>
<%- [webxml.jndi].flatten.each do |jndi| -%>
<resource-ref>
<res-ref-name><%= jndi %></res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
</resource-ref>
<%- end if webxml.jndi -%>
</web-app>
/config/initializers/scheduler_rufus.rb
require 'rufus-scheduler'
scheduler = Rufus::Scheduler.singleton
unless defined?(Rails::Console) || File.split($0).last == 'rake'
# only schedule when not running from the Ruby on Rails console
# or from a rake task
scheduler.in '1m' do
puts 'Hello World'
end
end
回答1:
Rufus-scheduler was scheduling twice because there were 2 Ruby runtimes in my application server. I had to limit to 1 runtime.
Change the pool of Rails runtimes in /config/warble.rb
config.webxml.jruby.min.runtimes = 1
config.webxml.jruby.max.runtimes = 1
来源：https://stackoverflow.com/questions/42119327/why-is-rufus-scheduling-the-job-twice