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package com.oracle.truffle.js.runtime;

import com.oracle.truffle.api.object.DynamicObject;

Provides information about the life-cycle of promises.
/**
 * Provides information about the life-cycle of promises.
 */
public interface PromiseHook {
    
PromiseHook with type TYPE_INIT is called when a new promise is created. /**
     * PromiseHook with type {@code TYPE_INIT} is called when a new promise is created.
     */
    int TYPE_INIT = 0;

    
PromiseHook with type TYPE_RESOLVE is called at the beginning of resolve or reject function defined by CreateResolvingFunctions. /**
     * PromiseHook with type {@code TYPE_RESOLVE} is called at the beginning of resolve or reject
     * function defined by {@code CreateResolvingFunctions}.
     */
    int TYPE_RESOLVE = 1;

    
PromiseHook with type TYPE_BEFORE is called at the beginning of the PromiseReactionJob. /**
     * PromiseHook with type {@code TYPE_BEFORE} is called at the beginning of the
     * {@code PromiseReactionJob}.
     */
    int TYPE_BEFORE = 2;

    
PromiseHook with type TYPE_AFTER is called right at the end of the PromiseReactionJob. /**
     * PromiseHook with type {@code TYPE_AFTER} is called right at the end of the
     * {@code PromiseReactionJob}.
     */
    int TYPE_AFTER = 3;

    
Invoked for each important change in the life-cycle of a promise.
Params:
changeType – type of the change: TYPE_INIT, TYPE_RESOLVE, TYPE_BEFORE or TYPE_AFTER.
promise – promise being changed.
parentPromise – parent promise when the promise is created (TYPE_INIT change type) by Promise.then/race/all or AsyncFunctionAwait. The parent promise is undefined in all other cases./**
     * Invoked for each important change in the life-cycle of a promise.
     * 
     * @param changeType type of the change: {@link #TYPE_INIT}, {@link #TYPE_RESOLVE},
     *            {@link #TYPE_BEFORE} or {@link #TYPE_AFTER}.
     * @param promise promise being changed.
     * @param parentPromise parent promise when the promise is created ({@link #TYPE_INIT} change
     *            type) by {@code Promise.then/race/all} or {@code AsyncFunctionAwait}. The parent
     *            promise is {@code undefined} in all other cases.
     */
    void promiseChanged(int changeType, DynamicObject promise, DynamicObject parentPromise);

}