plugin-engine
v5.0.800
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Powership server-utils
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PluginEngine
PluginEngine is a TypeScript library designed for extensible application architecture. It employs a Publish-Subscribe pattern with middleware support, allowing for a decoupled, event-driven architecture.
import { PluginEngine, Plugin } from 'plugin-engine';
// Initialize PluginEngine
const engine = new PluginEngine<{ httpRequest: { request: string } }>();
// Define a logging plugin with 'enter' hook
const logPlugin: Plugin<{ request: string }> = {
name: 'Log',
enter: (data, context) => {
console.log(`Request: ${data.request}`);
// 'context.abortWith' can be used to short-circuit the event chain
},
};
// Register the plugin to an 'httpRequest' event
engine.on('httpRequest', logPlugin);
// Define a modification plugin with 'enter' hook
const modifyPlugin: Plugin<{ request: string }> = {
name: 'Modify',
enter: (data) => {
data.request = `Modified: ${data.request}`;
return data;
},
};
// Register the modification plugin
engine.on('httpRequest', modifyPlugin);
// Execute the 'httpRequest' event
engine.exec('httpRequest', { request: 'GET /home' }).then((result) => {
console.log(`Final Request: ${result.request}`);
});
// Output: "Request: GET /home", "Request: Modified: GET /home", "Final Request: Modified: GET /home"
Key Concepts:
enter and exit hooks: Plugins can have
enter
andexit
hooks that run when an event is executed.abortWith: Within the
context
argument in the plugin, you can useabortWith
to immediately stop the processing of subsequent plugins and return the current state of the event data.Asynchronous Execution: The
exec
method returns a promise, allowing for asynchronous event handling.Error Handling: Plugins can define an
error
method to handle exceptions gracefully. PluginEngine?