Tutorial by Examples: r

Rename a file or directory. Status is in OS-ERROR. Can also be used to move files (or move and rename). OS-RENAME oldname newname Rename /tmp/old-name to /tmp/new-name: OS-RENAME VALUE("/tmp/old-name") VALUE("/tmp/new-name"). Move file c:\temp\old.txt to c:\new-dir\old....

Returns a list of all drives on a system. MESSAGE OS-DRIVES VIEW-AS ALERT-BOX. Result with four drives, C through F: On Linux the list will simply be empty as there by definitions are no "drives" connected. Listing directories is done in another way (INPUT FROM OS-DIR)

Client metrics cover the traffic between the client and the Varnish cache. sess_conn - Cumulative number of connections. client_req - Cumulative number of client requests. sess_dropped - Dropped connections because of a full queue. Monitor sess_conn and client_req to keep track of traffic vo...

Perhaps the most important performance metric is the hitrate. Varnish routes it's incoming requests like this: Hash, a cacheable request. This might be either hit or miss depending on the state of the cache. Hitpass, a not cacheable request. A hash with a miss and a hitpass will be fetched f...

You monitor the cached objects to see how often they expire and if they are "nuked". n_expired - Number of expired objects. n_lru_nuked - Last recently used nuked objects. Number of objects nuked (removed) from the cache because of lack of space. varnishstat -1 | grep "n_expire...

You need to keep track of some threads metrics to watch your Varnish Cache. Is it running out of OS resources or is it functioning well. threads - Number of threads in all pools. threads_created - Number of created threads. threads_failed - Number of times Varnish failed to create a thread. th...

There are a number of metrics describing the communication between Varnish and it's backends. The most important metrics here might be these: backend_busy - Number of http 5xx statuses recieved by a backend. With VCL you can configure Varnish to try another backend if this happens. backend_fail...

TypeScript enables editors to provide contextual documentation: You'll never forget whether String.prototype.slice takes (start, stop) or (start, length) again!

{-# LANGUAGE OverloadedStrings #-} module Main where import Data.Aeson main :: IO () main = do let example = Data.Aeson.object [ "key" .= (5 :: Integer), "somethingElse" .= (2 :: Integer) ] :: Value print . encode $ example

In foo.vala: void main (string[] args) { stdout.printf ("Hello world!"); } To compile the source into the foo binary: valac foo.vala To compile and run the source: vala foo.vala

project('Vala Project') glib_dep = dependency('glib-2.0') gobject_dep = dependency('gobject-2.0') executable('foo', 'foo.vala', dependencies: [glib_dep, gobject_dep]) Note: both glib-2.0 and gobject-2.0 dependencies are required unless --nostdpkg is explicitly given.

project('Posix-based Project', 'vala') add_project_arguments(['--nostdpkg'], language: 'vala') posix_dep = meson.get_compiler('vala').find_library('posix') executable('foo', 'foo.vala', dependencies: [posix_dep])

project('Mixed sources Project', 'vala') glib_dep = dependency('glib-2.0') gobject_dep = dependency('gobject-2.0') executable('foo', 'foo.vala', 'bar.c', dependencies: [glib_dep, gobject_dep]) In foo.vala: namespace Foo { public extern int bar (); public int main (string[] arg...

<?php $ch = curl_init(); curl_setopt($ch, CURLOPT_URL, "https://api.dropboxapi.com/2/files/list_folder"); curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); curl_setopt($ch, CURLOPT_CAINFO, "cacert.pem"); curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 0); curl_setopt($ch, CURLOP...

var foo = new uint8[12]; var bar = (owned) foo; assert (foo == null); The bar variable will own the value previously owned by foo.

In PostgreSQL you can create Arrays of any built-in, user-defined or enum type. In default there is no limit to an Array, but you can specify it. Declaring an Array SELECT integer[]; SELECT integer[3]; SELECT integer[][]; SELECT integer[3][3]; SELECT integer ARRAY; SELECT integer ARRAY[3]; ...

Say "Hello", Rails To get Rails saying "Hello", you need to create at minimum a controller and a view. A controller's purpose is to receive specific requests for the application. Routing decides which controller receives which requests. Often, there is more than one route t...

As edgeapi suggests, it provides an interface for protecting attributes from end-user assignment. This makes Action Controller parameters forbidden to be used in Active Model mass assignment until they have been whitelisted. In addition, parameters can be marked as required and flow through a prede...

import javax.inject.Singleton; import dagger.Module; import dagger.Provides; @Module public class VehicleModule { @Provides @Singleton Motor provideMotor(){ return new Motor(); } @Provides @Singleton Vehicle provideVehicle(){ return new Vehicle(...

Now that you have the providers for your different models, you need to request them. Just as Vehicle needs Motor, you have to add the @Inject annotation in the Vehicle constructor as follows: @Inject public Vehicle(Motor motor){ this.motor = motor; } You can use the @Inject annotation to ...