Microservice architecture, does it really encourage copy / paste? -


i'm working in middle size organisation. year started refactor our old solution creating microservices. backend part go chosen, front have node.js

now imagine have html form user puts data. after front end part makes own validation , call 1 of 3 different endpoints (three different microservices).

this validated front end data validated 3 micro services separately. same rules copy/pasted. , there lot of other examples this.

i proposed create validator service perform validation in 1 place , got answer 'in microservices architecture cannot create strong dependencies'

my question if 'strong dependencies' bad need stupid copy/paste , create unit tests copy/pasted code (we copy/paste them , change names). if 'strong dependencies' bad give examples why.

for first question, answer shouldn't ever have "copy/paste" anything, , elimination of "hard" synchronous dependencies between services has nothing it. it's strong sign functional boundaries of monolithic decomposition faulty. question why doing validation on same data 3 separate services when single microservice supposed own , manage own data? also, it's common have near cross-cutting utility-type concerns more 1 microservice may share, , common library (jar in case of java example) not violate intent of architecture. no copy/past needed.

now here why "strong" synchronous dependencies bad idea. intent of microservice architecture deploy new , improved "single/do-one-thing) features production minimum of risk , without adversely impacting performance. enables evolutionary improvement, , accelerates time-to-market of desired features. if new service misbehaves, affects functionality responsible - nothing else. imagine if decompose monolithic application "code-module" rather feature/function. end distributed monolith! not loose advantages , intent of architecture, performance , complexity adversely impacted perhaps fatal degree.


Comments

Post a Comment

Popular posts from this blog

python Tkinter Capturing keyboard events save as one single string -

is possible store keyboard events 1 string? code below stores 1 char , prints it. card reader or bar code reader, contains collection of character/ string not 1 character @ time. goal save char pressed text variable. from tkinter import * root = tk() def key(event): text= event.char text+= event.char print ("pressed", text) def callback(event): frame.focus_set() print ("clicked at", event.x, event.y) frame = frame(root, width=100, height=100) frame.bind("<key>", key) frame.bind("<button-1>", callback) frame.pack() root.mainloop() currently, creating text variable , everytime key() function gets called, , text stores last character typed. you can define text module level variable , , use module level text inside key function - text = '' def key(event): global text text+= event.char print("pressed", text)
Read more

android - InAppBilling registering BroadcastReceiver in AndroidManifest -

i'm implementing inapp billing in android app. works well, however, i'm trying decouple broadcast receiver activity manifest. suggestion in android's trivialdrive sample: // important: dynamically register broadcast messages updated purchases. // register receiver here instead of <receiver> in manifest // because call getpurchases() @ startup, therefore can ignore // broadcasts sent while app isn't running. // note: registering listener in activity bad idea, done here // because sample. regardless, receiver must registered after // iabhelper setup, before first call getpurchases(). currently there's class extends broadcastreceiver : public class iabbroadcastreceiver extends broadcastreceiver { /** * intent action receiver should filter for. */ public static final string action = "com.android.vending.billing.purchases_updated"; private final iabbroadcastlistener mlistener; public iabbroadcastreceiver(iabbroadcastlistener listener) { m
Read more

javascript - Z-index in d3.js -

i have map , when hover effect on region of map below yellow line , circle, last ones disappear. how can solve problem? http://jsfiddle.net/ot21n9qx/ var arc = g.append("path") .style("fill", "none") .style("stroke", "yellow") .style("stroke-width", 2) .attr("d", "m" + pathorigin[0] + "," + pathorigin[1] + " q" + svgpoint[0] + "," + pathorigin[1] + " " + svgpoint[0] + "," + svgpoint[1]); var circlesize = d3.scale.linear() .domain([0, 0.5, 1]) .range([4, 10, 4]); svg not have z order draws objects in order created. need create path , circle after create highlight regions. here forked fiddle: http://jsfiddle.net/o00fzgaf/1/
Read more