offlinets

offlinets will check service availability by pinging it.

Usage

Define any class that should be notified and updated when the state of service changes. Annotate it with @Observe() passing in the period of ping interval and a PingService as config. Default implementation will be provided if PingService is not found.

PingService interface looks like this:

interface PingService {
    ping: () => Promise<boolean>;
}

This syntax uses the DefaultPingService.

@Observe({
    period: 1000
})
export class SampleObserver {
    state: number = 0;

    //this function will be called when state of the system changes.
    updateState() {
        this.state = 999;
    }
    constructor() {
    }
}

User implemented PingService.

@Observe({
    period: 1000,
    ping: new PingService()
})
export class SampleObserver {
    state: number = 0;
    //this function will be called when state of the system changes.
    async updateState(state: StateType) {
        this.state = 999;
        return true
    }
    constructor() {
    }
}

StateType is as follows

export enum StateType {
    ONLINE,
    OFFLINE
}