Ionic-3 how to set value from one file to provider, and access in another file

Here is my @Injecatable() / provider

 setdata(data) {
>     setTimeout( this.data=data);
>     console.log("insidee single:", this.data);
>   }
>   log(){
>     console.log("insideeLog single:", this.data);
>     this.welcomeData = this.data;
>     console.log("welcome single:", this.welcomeData);
>   }

File 1 fixing data to the provider

this.http.get(this.provider.phpURI + "welcome.php").map(res => res.json()).subscribe(data => {
>     this.single.setdata(data);
>        this.single.log();

File 2 HOw to access updated data in second file, am trying like this below

this.single.log();
its not working for 2nd file, Thanks…