rake multitask example

rake multitask

task :task1 => [:big_db_task] do
        sleep 1
        puts "Task 1"
end
task :big_db_task do
        puts "Big db task"
end
task :task3 => [:big_db_task] do
        puts "Task 3"
end
task :task4 => [:big_db_task] do
        puts "Task 4"
end

task :rollups do
        puts "running rollups"
end

task :run_reports => [:rollups] do
        puts "Run Reports"
end

task :basecamp_upload => [:run_reports] do
        puts "Basecamp upload"
end

task :new_task do
        Rake::Task[:mytask].enhance([:task4]).invoke
end

multitask :mytask => [:task1, :task3, :rollups, :run_reports, :basecamp_upload] do
        puts "Completed parallel execution of tasks 1 through 3."
end