reactive programming - RxJava cache intermediate results -


i'm developing android client kaltura video platform, , develop uploading video. feature consists of following steps:

  1. create mediaentry

    params: name, description

  2. create uploadtoken

    params: filename, mediaentryid(which received @ step 1)

  3. addcontent - in other words bind mediaentry uploadtoken

    params: mediaentryid(which received @ step 1), uploadtokenid(which received @ step 2)

  4. uploadvideo params: uploadtokenid(which received @ step 2), videodata

here code using rxjava:

api.createmediaentry(name, description)                     .flatmap(mediaentry -> {                         mediaentryid = mediaentry.getid();                         return api.createuploadtoken(this.videouri.getpath(), mediaentry.getid());                     })                     .flatmap(uploadtoken -> {                         uploadtokenid = uploadtoken.getid();                         return api.addcontent(mediaentryid, uploadtoken.getid());                     })                     .flatmap(mediaentry -> api.uploadvideo(uploadtokenid, fileutil.gettypedvideofilefromuri(this.videouri, uploadvideoactivity.this)))                     .doonerror(throwable -> {                         throwable.printstacktrace();                         dismissprogressdialog();                     })                     .doonnext(response -> {                      })                     .dooncompleted(() -> {                         dismissprogressdialog();                     })                     .subscribe();

where api retrofit rest adapter.

as can see code, need save mediaentryid @ step 1, , uploadtokenid @ step 2, use them @ step 3. want undestand, there way save mediaentry step 1 , uploadtoken step 2 using them later, or may there way change code, exclude saving data local variables?

ideal solution me looks this:

api.createmediaentry(name, description)                     .dosomethingwithmedaientry(mediaentry -> mediaentry)                     .flatmap(mediaentry -> api.createuploadtoken(this.videouri.getpath(), mediaentry.getid()))                     .dosomethingwithuploadtoken(token -> token)                     .getmediaentryanduploadtokensomehow((mediaentry, uploadtoken) -> api.addcontent(mediaentry.getid(), uploadtoken.getid()))                     .getuploadtokensomehow(uploadtoken -> api.uploadvideo(uploadtoken.getid(), fileutil.gettypedvideofilefromuri(this.videouri, uploadvideoactivity.this)))                     .doonerror(throwable -> {                         throwable.printstacktrace();                         dismissprogressdialog();                     })                     .doonnext(response -> {                      })                     .dooncompleted(() -> {                         dismissprogressdialog();                     })                     .subscribe();

aside using tuple, can nest observables.

api.createmediaentry(name, description)     .flatmap(createdmediaentry -> api.createuploadtoken(this.videouri.getpath(), createdmediaentry.getid())                     .flatmap(uploadtoken -> api.addcontent(createdmediaentry.getid(), uploadtoken.getid())                                     .flatmap(addedmediaentry -> api.uploadvideo(uploadtoken.getid(), , , ))                     )     )     ...

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