Imagine you have a global "execution context" service for logging 
(comparable to MDC) and two kinds of triggers like user interaction and web 
socket connection.

We have a logger service, which uses the "execution context" for log 
messages.

The user press on a button, the service gets the context, a http request 
will be triggered and the result interpreted including logging.

Meanwhile we receive a message over the websocket and needs to interpret it 
as well. So we set our "execution context" and overwrite the existing one 
in the services.

The issue will be that the log messages will get the same execution context 
if the websocket observable will be triggered before the http result is 
received.

Is there any possibility to have own execution context for multiple 
observables?  
I was thinking about using the NgZone (zone.js) for this, but I don't find 
any method for storing a context. There is no direct access to the fork 
method for storing zone properties.

I am using Angular 2.5.7.

StackOverflow <http://stackoverflow.com/q/42854478/390177>

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