code: public void setSources(java.util.Collection<InputSourceRequest> sources) {
          if (sources == null) {
              this.sources = null;
              return;
          }
  
          this.sources = new java.util.ArrayList<InputSourceRequest>(sources);
      }
docs: The source URLs for a PULL-type input. Every PULL type input needs exactly two source URLs for redundancy. Only
  specify sources for PULL type Inputs. Leave Destinations empty.
  
  @param sources
  The source URLs for a PULL-type input. Every PULL type input needs exactly two source URLs for redundancy.
  Only specify sources for PULL type Inputs. Leave Destinations empty.