From ca11db68a68638e4a97f02e35a263cf2cc24f1f9 Mon Sep 17 00:00:00 2001
From: MiaoWoo <admin@yumc.pw>
Date: Thu, 27 Feb 2020 18:20:45 +0800
Subject: [PATCH] feat: add normal env task

Signed-off-by: MiaoWoo <admin@yumc.pw>
---
 packages/ployfill/src/task.ts | 141 ++++++++++++++++++++++++++++++++++
 1 file changed, 141 insertions(+)
 create mode 100644 packages/ployfill/src/task.ts

diff --git a/packages/ployfill/src/task.ts b/packages/ployfill/src/task.ts
new file mode 100644
index 00000000..1dacb917
--- /dev/null
+++ b/packages/ployfill/src/task.ts
@@ -0,0 +1,141 @@
+(function nashornEventLoopMain(context) {
+    'use strict';
+
+    var Thread = Java.type('java.lang.Thread');
+    var Phaser = Java.type('java.util.concurrent.Phaser');
+    var ArrayDeque = Java.type('java.util.ArrayDeque');
+    var HashMap = Java.type('java.util.HashMap');
+    var TimeUnit = Java.type("java.util.concurrent.TimeUnit");
+    var Runnable = Java.type('java.lang.Runnable');
+
+    var globalTimerId;
+    var timerMap;
+    var eventLoop;
+    var phaser = new Phaser();
+
+    // __NASHORN_POLYFILL_TIMER__ type is ScheduledExecutorService
+    var scheduler = context.__NASHORN_POLYFILL_TIMER__;
+
+    resetEventLoop();
+
+    //   console.log('main javasript thread ' + Thread.currentThread().getName());
+
+    function resetEventLoop() {
+        globalTimerId = 1;
+        if (timerMap) {
+            timerMap.forEach(function(key, value) {
+                value.cancel(true);
+            })
+        }
+        timerMap = new HashMap();
+        eventLoop = new ArrayDeque();
+    }
+
+    function waitForMessages() {
+        phaser.register();
+        var wait = !(eventLoop.size() === 0);
+        phaser.arriveAndDeregister();
+        return wait;
+    }
+
+    function processNextMessages() {
+        var remaining = 1;
+        while (remaining) {
+            phaser.register();
+            var message = eventLoop.removeFirst();
+            remaining = eventLoop.size();
+            phaser.arriveAndDeregister();
+
+            var fn = message.fn;
+            var args = message.args;
+
+            try {
+                fn.apply(context, args);
+            } catch (e) {
+                console.trace(e);
+                console.trace(fn);
+                console.trace(args);
+            }
+        }
+    }
+
+    context.nashornEventLoop = {
+        process: function() {
+            while (waitForMessages()) {
+                processNextMessages()
+            }
+        },
+        reset: resetEventLoop
+    };
+
+
+    function createRunnable(fn, timerId, args, repeated) {
+        return new Runnable({
+            run: function() {
+                try {
+                    var phase = phaser.register();
+                    eventLoop.addLast({
+                        fn: fn,
+                        args: args
+                    });
+                } catch (e) {
+                    console.trace(e);
+                } finally {
+                    if (!repeated) timerMap.remove(timerId);
+                    phaser.arriveAndDeregister();
+                }
+            }
+        })
+    }
+
+    var setTimeout = function(fn, millis /* [, args...] */) {
+        var args = [].slice.call(arguments, 2, arguments.length);
+
+        var timerId = globalTimerId++;
+        var runnable = createRunnable(fn, timerId, args, false);
+
+        var task = scheduler.schedule(runnable, millis, TimeUnit.MILLISECONDS);
+        timerMap.put(timerId, task);
+
+        return timerId;
+    };
+
+    var setImmediate = function(fn /* [, args...] */) {
+        var args = [].slice.call(arguments, 1, arguments.length);
+        // @ts-ignore
+        return setTimeout(fn, 0, args);
+    }
+
+    var clearImmediate = function(timerId) {
+        clearTimeout(timerId);
+    }
+
+    var clearTimeout = function(timerId) {
+        var task = timerMap.get(timerId);
+        if (task) {
+            task.cancel(true);
+            timerMap.remove(timerId);
+        }
+    };
+
+    var setInterval = function(fn, delay /* [, args...] */) {
+        var args = [].slice.call(arguments, 2, arguments.length);
+        var timerId = globalTimerId++;
+        var runnable = createRunnable(fn, timerId, args, true);
+        var task = scheduler.scheduleWithFixedDelay(runnable, delay, delay, TimeUnit.MILLISECONDS);
+        timerMap.put(timerId, task);
+        return timerId;
+    };
+
+    var clearInterval = function(timerId) {
+        clearTimeout(timerId);
+    };
+
+    context.setTimeout = setTimeout;
+    context.clearTimeout = clearTimeout;
+    context.setImmediate = setImmediate;
+    context.clearImmediate = clearImmediate;
+    context.setInterval = setInterval;
+    context.clearInterval = clearInterval;
+    // @ts-ignore
+})(typeof global !== "undefined" && global || typeof self !== "undefined" && self || this);
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