Annotations

import ballerina/io;

// The `@display` annotation applies to the transform function.
@display {
    label: "Transform",
    iconPath: "transform.png"
}
public function transform(string s) returns string {
    return s.toUpperAscii();
}

public function main() {
    // The `@strand` annotation applies to the `start` action.
    future<int> fut = @strand {thread: "any"} start foo();

    int|error x = wait fut;
    io:println(x);
}

public function foo() returns int {
    return 10;
}

Annotations

Annotations start with @tag and they come before what they apply to. Unprefixed tags refer to standard platform-defined annotations and prefixed tags refer to annotations declared in modules. @tag can be followed by record constructor expression.

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Consuming services: client objects

import ballerina/io;

@display {
    label: "Transform",
    iconPath: "transform.png"
}
public function transform(string s) returns string {
    return s.toUpperAscii();
}

The @display annotation applies to the transform function.

public function main() {

    future<int> fut = @strand {thread: "any"} start foo();

The @strand annotation applies to the start action.

    int|error x = wait fut;
    io:println(x);
}

public function foo() returns int {
    return 10;
}

bal run annotations.bal
10