98 | A Promise is a proxy for a value not necessarily known when 99 | the promise is created. It allows you to associate handlers 100 | with an asynchronous action's eventual success value or failure reason. 101 | This lets asynchronous methods return values like synchronous methods: 102 | instead of immediately returning the final value, 103 | the asynchronous method returns a promise to supply the value 104 | at some point in the future. 105 |
106 | For more information on Javascript Promise 107 | please visit the official Mozilla Promise documentation 108 | 109 | @see 110 | https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise 111 |
112 | This Android Promise Library slightly different than the native Javascript Promise. 113 | This promise object has two imprtant method i.e. `resolve()` and `reject()`, 114 | whenevey you done withe your process just call resolve or reject 115 | function based on your state. 116 | The resultant value will be automaticall passed as argument to the 117 | followng `then()` or `error()` function. 118 |
119 | You can write `n` numbers of `then()` chain. 120 |
121 | It supports above JAVA 1.8 122 | 123 | 124 | # LICENCE 125 | 126 | 127 | Copyright (c) 2017 CRAWLINK NETWORKS PVT. 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LTD.] 190 | 191 | Licensed under the Apache License, Version 2.0 (the "License"); 192 | you may not use this file except in compliance with the License. 193 | You may obtain a copy of the License at 194 | 195 | http://www.apache.org/licenses/LICENSE-2.0 196 | 197 | Unless required by applicable law or agreed to in writing, software 198 | distributed under the License is distributed on an "AS IS" BASIS, 199 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 200 | See the License for the specific language governing permissions and 201 | limitations under the License. 202 | -------------------------------------------------------------------------------- /Promise.java: -------------------------------------------------------------------------------- 1 | /* 2 | * CRAWLINK Networks Pvt Ltd. CONFIDENTIAL 3 | * Copyright (c) 2017 All rights reserved. 4 | * 5 | * The source code contained or described herein and all documents 6 | * related to the source code ("Material") are owned by CRAWLINK 7 | * Networks Pvt Ltd. No part of the Material may be used, copied, 8 | * reproduced, modified, published, uploaded,posted, transmitted, 9 | * distributed, or disclosed in any way without CRAWLINK Networks 10 | * Pvt Ltd. prior written permission. 11 | * 12 | * No license under any patent, copyright, trade secret or other 13 | * intellectual property right is granted to or conferred upon you 14 | * by disclosure or delivery of the Materials, either expressly, by 15 | * implication, inducement, estoppel or otherwise. Any license 16 | * under such intellectual property rights must be express and 17 | * approved by CRAWLINK Networks Pvt Ltd. in writing. 18 | * 19 | */ 20 | 21 | package com.crawlink; 22 | 23 | 24 | import android.os.Handler; 25 | import android.os.Looper; 26 | import android.util.Log; 27 | 28 | import java.util.ArrayList; 29 | import java.util.List; 30 | 31 | /** 32 | * The Promise object represents the eventual completion (or failure) 33 | * of an asynchronous operation, and its resulting value. 34 | *
35 | * A Promise is a proxy for a value not necessarily known when 36 | * the promise is created. It allows you to associate handlers 37 | * with an asynchronous action's eventual success value or failure reason. 38 | * This lets asynchronous methods return values like synchronous methods: 39 | * instead of immediately returning the final value, 40 | * the asynchronous method returns a promise to supply the value 41 | * at some point in the future. 42 | *
43 | * For more information on Javascript Promise 44 | * please visit the official Mozilla Promise documentation 45 | * 46 | * @see 47 | * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise 48 | *
49 | * This Android Promise Library slightly different than the native Javascript Promise. 50 | * This promise object has two imprtant method i.e. `resolve()` and `reject()`, 51 | * whenevey you done withe your process just call resolve or reject 52 | * function based on your state. 53 | * The resultant value will be automaticall passed as argument to the 54 | * followng `then()` or `error()` function. 55 | *
56 | * You can write `n` numbers of `then()` chain. 57 | *
58 | * It supports above JAVA 1.8 59 | */ 60 | 61 | public class Promise { 62 | 63 | private static final String TAG = "Promise"; 64 | private Handler handler; 65 | private OnSuccessListener onSuccessListener; 66 | private OnErrorListener onErrorListener; 67 | private Promise child; 68 | private boolean isResolved; 69 | private Object resolvedObject; 70 | private boolean isRejected; 71 | private Object rejectedObject; 72 | private Object tag; 73 | 74 | 75 | public Promise() { 76 | // Trigger all promise calls in UI thread 77 | // if (Looper.getMainLooper().getThread() == Thread.currentThread()) { 78 | // this.handler = new Handler(); 79 | // } 80 | 81 | this.handler = new Handler(Looper.getMainLooper()); 82 | } 83 | 84 | public static Promise chain(Object obj) { 85 | Promise p = new Promise(); 86 | p.resolve(obj); 87 | return p; 88 | } 89 | 90 | public static Promise all(Promise... list) { 91 | Promise p = new Promise(); 92 | int size = 0; 93 | if (list != null) { 94 | size = list.length; 95 | } 96 | Object results[] = new Object[size]; 97 | if (list == null || list.length <= 0) { 98 | Log.w(TAG, "Promise list should not be empty!"); 99 | p.resolve(results); 100 | return p; 101 | } 102 | 103 | if (list != null && list.length > 0) { 104 | new Runnable() { 105 | int completedCount = 0; 106 | 107 | @Override 108 | public void run() { 109 | for (int i = 0; i < list.length; i++) { 110 | Promise promise = list[i]; 111 | promise.setTag(i); 112 | promise.then(res -> { 113 | results[(int) promise.getTag()] = res; 114 | completed(null); 115 | return res; 116 | }).error(err -> { 117 | completed(err); 118 | }); 119 | } 120 | } 121 | 122 | private void completed(Object err) { 123 | completedCount++; 124 | if (err != null) { 125 | p.reject(err); 126 | } else if (completedCount == list.length) { 127 | p.resolve(results); 128 | } 129 | } 130 | }.run(); 131 | } else { 132 | Log.w(TAG, "Promises should not be empty!"); 133 | p.resolve(results); 134 | } 135 | 136 | 137 | return p; 138 | } 139 | 140 | public static Promise series(List list, OnSuccessListener listener) { 141 | Promise p = new Promise(); 142 | int size = 0; 143 | if (list != null) { 144 | size = list.size(); 145 | } 146 | ArrayList