# Bigger Applications - Multiple Files { #bigger-applications-multiple-files }

If you are building an application or a web API, it's rarely the case that you can put everything in a single file.

**FastAPI** provides a convenience tool to structure your application while keeping all the flexibility.

/// info

If you come from Flask, this would be the equivalent of Flask's Blueprints.

///

## An example file structure { #an-example-file-structure }

ent,o=e.placement,i=o?F(o):null,a=o?U(o):null,s=n.x+n.width/2-r.width/2,f=n.y+n.height/2-r.height/2;switch(i){case D:t={x:s,y:n.y-r.height};break;case A:t={x:s,y:n.y+n.height};break;case L:t={x:n.x+n.width,y:f};break;case P:t={x:n.x-r.width,y:f};break;default:t={x:n.x,y:n.y}}var c=i?z(i):null;if(null!=c){var p="y"===c?"height":"width";switch(a){case W:t[c]=t[c]-(n[p]/2-r[p]/2);break;case B:t[c]=t[c]+(n[p]/2-r[p]/2)}}return t}function Y(e){return Object.assign({},{top:0,right:0,bottom:0,left:0},e)}function...

        switch (form.crudMode) {
        case CrudMode.CREATE:
            return OptionalEntity.of(new RelatedContent()).map(entity -> {
                entity.setCreatedBy(username);
                entity.setCreatedTime(currentTime);
                return entity;
            });
        case CrudMode.EDIT:
            if (form instanceof EditForm) {

NOTE:

- `timeToFirstByte` and `timeToResponse` will be expressed in Nanoseconds.
- Additionally in the case of the erasure coded setup `tags.objectLocation` provides per object details about
  - Pool number the object operation was performed on.
  - Set number the object operation was performed on.

In this case, you could want to document how that external API *should* look like. What *path operation* it should have, what body it should expect, what response it should return, etc.

## An app with callbacks { #an-app-with-callbacks }

Nesse caso, você poderia querer documentar como essa API externa *deveria* ser. Que *operação de rota* ela deveria ter, que corpo ela deveria esperar, que resposta ela deveria retornar, etc.

## Um aplicativo com callbacks

						globalMinioDefaultRegion, serviceS3), "policy"),
				},
				"Policy": []string{"policy"},
			},
			expected: ErrNone,
		},
	}

	// Run each test case individually.
	for i, testCase := range testCases {
		_, code := doesPolicySignatureMatch(testCase.form)
		if code != testCase.expected {

    /**
     * Adds a name/value pair to the formatted output in {@code name=value} format. If {@code value}
     * is {@code null}, the string {@code "null"} is used, unless {@link #omitNullValues()} is
     * called, in which case this name/value pair will not be added.
     */
    @CanIgnoreReturnValue
    public ToStringHelper add(String name, @Nullable Object value) {
      return addHolder(name, value);
    }

    /**

    }

    @Override
    public byte[] initSecContext(final byte[] token, final int offset, final int len) throws SmbException {
        return switch (this.state) {
        case 1 -> makeNegotiate(token);
        case 2 -> makeAuthenticate(token);
        default -> throw new SmbException("Invalid state");
        };
    }

    /**

//
//	-1 if x <  y
//	 0 if x == y
//	+1 if x >  y
func CmpInt(x, y *Int) int {
	x.doinit()
	y.doinit()
	switch cmp := C.mpz_cmp(&x.i[0], &y.i[0]); {
	case cmp < 0:
		return -1
	case cmp == 0:
		return 0
	}
	return +1
}

// DivModInt sets q = x / y and r = x % y.
func DivModInt(q, r, x, y *Int) {
	q.doinit()
	r.doinit()
	x.doinit()
	y.doinit()