* **Synchronous:** your thread blocks until the response is readable.
 * **Asynchronous:** you enqueue the request on any thread, and get [called back](https://square.github.io/okhttp/5.x/okhttp/okhttp3/-callback/) on another thread when the response is readable.

    /**
     * Validates the password and confirmation fields in the form for user creation and update.
     *
     * @param form the form containing password and confirmation fields
     * @param validationErrorLambda callback to report validation errors
     */
    protected void verifyPassword(final CreateForm form, final VaErrorHook validationErrorLambda) {
        if (form.crudMode == CrudMode.CREATE && StringUtil.isBlank(form.password)) {

     *
     * Use this API to attach timing, debugging, or other application data to a request so that
     * you may read it in interceptors, event listeners, or callbacks.
     */
    @JvmName("reifiedTag")
    inline fun <reified T : Any> tag(tag: T?): Builder = tag(T::class, tag)

    /**

getWindow from './getWindow';\n\nfunction attachToScrollParents(scrollParent, event, callback, scrollParents) {\n  const isBody = scrollParent.nodeName === 'BODY';\n  const target = isBody ? scrollParent.ownerDocument.defaultView : scrollParent;\n  target.addEventListener(event, callback, { passive: true });\n\n  if (!isBody) {\n    attachToScrollParents(\n      getScrollParent(target.parentNode),\n      event,\n      callback,\n      scrollParents\n    );\n  }\n  scrollParents.push(target);\n}\n\n/**\n...

	if tx.Tx != nil && !reflect.ValueOf(tx.Tx).IsNil() {
		return tx.Tx.Commit()
	}
	return ErrInvalidTransaction
}

func (tx *PreparedStmtTX) Rollback() error {
	if tx.Tx != nil && !reflect.ValueOf(tx.Tx).IsNil() {
		return tx.Tx.Rollback()
	}
	return ErrInvalidTransaction
}

func (tx *PreparedStmtTX) ExecContext(ctx context.Context, query string, args ...interface{}) (result sql.Result, err error) {

    protected void async(final AsyncManager asyncManager, final Runnable runnable) {
        asyncManager.async(new ConcurrentAsyncCall() {
            @Override
            public void callback() {
                runnable.run();
            }

            @Override
            public boolean asPrimary() {
                return true; // mail is primary business
            }
        });

package callbacks

import "gorm.io/gorm"

type BeforeCreateInterface interface {
	BeforeCreate(*gorm.DB) error
}

type AfterCreateInterface interface {
	AfterCreate(*gorm.DB) error
}

type BeforeUpdateInterface interface {
	BeforeUpdate(*gorm.DB) error
}

type AfterUpdateInterface interface {
	AfterUpdate(*gorm.DB) error
}

type BeforeSaveInterface interface {
	BeforeSave(*gorm.DB) error
}

type ConnPoolBeginner interface {
	BeginTx(ctx context.Context, opts *sql.TxOptions) (ConnPool, error)
}

// TxCommitter tx committer
type TxCommitter interface {
	Commit() error
	Rollback() error
}

// Tx sql.Tx interface
type Tx interface {
	ConnPool
	TxCommitter
	StmtContext(ctx context.Context, stmt *sql.Stmt) *sql.Stmt
}

// Valuer gorm valuer interface
type Valuer interface {

utilizar o [MotorClient do MongoDB](https://stackoverflow.com/questions/41584243/runtimeerror-task-attached-to-a-different-loop)) Lembre-se de instanciar objetos que precisam de um loop de eventos (*event loop*) apenas em funções assíncronas, e.g. um callback `@app.on_event("startup")`.

///...

В прежних версиях NodeJS/браузерного JavaScript вы бы использовали «callbacks» (обратные вызовы), что приводит к «callback hell» (ад обратных вызовов).

## Сопрограммы { #coroutines }