Update the alternative receiver code

examples/alternate-receive/alternate_receive.bal

@@ -1,46 +1,57 @@
+import ballerina/http;
 import ballerina/io;
 import ballerina/lang.runtime;
 
 public function main() {
  worker w1 {
- 2 -> w3;
+ fetch("https://postman-echo.com/get?worker=w1") -> w3;
  }
 
  worker w2 {
- runtime:sleep(2);
- 3 -> w3;
+ runtime:sleep(3);
+ fetch("https://postman-echo.com/get?worker=w2") -> w3;
  }
 
- worker w3 returns int {
- // The value of the variable `result` is set as soon as the values from either
+ worker w3 returns json|error? {
+ // The value of the variable `result` is set as soon as the value from either
  // worker `w1` or `w2` is received.
- int result = <- w1 | w2;
- return result;
+ json|error result = <- w1 | w2;
+ return getJsonProperty(result);
  }
 
  worker w4 returns error? {
- int value = 10;
- if value == 10 {
- return error("Error in worker 4");
- }
- value -> w6;
+ // invalid url
+ fetch("https://postman-echo.com/ge?worker=w4") -> w6;
  }
 
- worker w5 {
+ worker w5 returns error? {
  runtime:sleep(2);
- 3 -> w6;
+ fetch("https://postman-echo.com/get?worker=w5") -> w6;
  }
 
- worker w6 returns int|error? {
+ worker w6 returns json|error? {
  // Alternate receive action waits until a message that is not an error is received. 
- // Since `w4` returns an error, it waits further and sets the value that is received from `w5`.
- int a = check <- w4 | w5;
- return a;
+ // Since `w3` returns an error, it waits further and sets the value that is received from `w4`.
+ json|error result = <- w4 | w5;
+ return getJsonProperty(result);
  }
 
- int w3Result = wait w3;
+ json|error? w3Result = wait w3;
  io:println(w3Result);
 
- int|error? w6Result = wait w6;
+ json|error? w6Result = wait w6;
  io:println(w6Result);
 }
+
+function fetch(string url) returns json|error {
+ http:Client cl = check new (url);
+ map<json> payload = check cl->get("");
+ return payload["args"];
+}
+
+function getJsonProperty(json|error data) returns json|error? {
+ if data is error {
+ return data.message();
+ }
+ return data.'worker;
+}

examples/alternate-receive/alternate_receive.md

@@ -1,6 +1,6 @@
 # Alternate receive
 
-The alternate receive action can be used to receive values from multiple send actions. It operates by waiting until it encounters a non-error message, a panic termination status on a closed channel, or the closure of all channels. Alternate receive action sets the first non-error value it encounters as the outcome.
+The alternate receive action can be used to receive one of multiple values corresponding to multiple send actions. It operates by waiting until it encounters a non-error message, a panic termination status on a closed channel, or the closure of all channels. Alternate receive action sets the first non-error value it encounters as the result.
 
 ::: code alternate_receive.bal :::
 

examples/alternate-receive/alternate_receive.out

@@ -1,3 +1,3 @@
 $ bal run alternate_receive.bal
-2
-3
+w1
+w5