The tour explains main functions of Round using a client utility command, round.
To use the utility, start a single node of Round at first:
roundd
Next, let's start the client utility command:
round shell
To show all commands of round, use help command:
round> help
Immediately after the round command is started, the command don't know other nodes in the network.
To find other nodes in the network, use search command at first:
round> search
To show the found nodes in the network, use list command:
round> list
[round] # --> cluster name
[0] 192.168.100.26:7476 # --> node ipaddr:port
The list command outputs only a current cluster. Round uses the cluster name, round, as default. Otherwise use use command to select a other target cluster:
round> use <cluster name>
The node is running as a RPC node, and the node can execute any jobs to use post_job method. Using the method, the developers can execute any jobs on the node.
In this section, post a simple job which returns a current date using JavaScript:
rounc > post_job(0, { "language":"js", "code":"var now = new Date();now.toString();" })
Sat May 02 2015 17:30:17 GMT+0900 (JST)
The node is running as a programmable RPC node. The node has some embedded default methods such as post_job, and the developers can add new methods using set_method method.
In this section, add a simple echo method which returns the given parameters as it is using JavaScript. To add the echo method, use set_method:
round> set_method(0, { "language":"js", "name":"echo", "code":"function echo(params) {return params;}" })
To confirm whether the echo method is added, call echo method:
round> echo(0, "hello")
"hello"
The node has a local registry to store any key values in the node.
In this section, use the registry function. To set a key value into the registry, use set_registry method:
round> set_registry(0, {"key":"test", "value":"hello"})
To confirm whether the set_registry method is success, call get_registry method:
round> get_registry(0, {"key":"test"})
{"key":"test","lts":xxxxx,"ts":xxxxx,"value":"hello"}
The node has a route function. Using the route function, the developer can connect some methods like Unix pipes.
In this section, add a simple route function which adds a current date prefix use route function.
round> set_method(0, { "language":"js", "name":"echo", "code":"function echo(params) {return params;}" })
round> set_method(0, { "language":"js", "name":"echo_log", "code":"function echo_log(params) {var now = new Date(); return now.toString() + ' : ' + params;}" })
round> set_route(0, {"name":"echo", "src":"echo", "dest":"echo_log"})
To confirm whether the route is added, call echo method:
round> echo(0, "hello")
"Thu Jun 11 2015 01:13:49 GMT+0900 (JST) : hello"
The alias function supports to create an alias method of defined methods in the local node with default parameters.
In this section, add a simple hello alias using a'echo' method which returns the given parameters as it is using JavaScript. To add the hello alias, use set_alias:
round> set_method(0, { "language":"js", "name":"echo", "code":"function echo(params) {return params;}" })
round> set_alias(0, { "name":"hello", "method":"echo", "defaults":"hello" })
To confirm whether the echo method is added, call echo method:
round> hello(0)
"hello"
The node has some embedded default triggers. In addition to the default triggers, the developers can add user original triggers using set_timer.
In this section, create a simple counter which is updated every second:
round> set_timer(0, { "name":"", "duration":1.0 })