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Articles by Callback callback

Enhancing Streaming and Request Handling Efficiency with gRPC and Coroutines: Part 4

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By Callback callback, return requestContxet
| synerise.com
Overview As highlighted in our previous articles, the gateway plays a crucial role in receiving responses from Query API Gateway, interacting with multiple workers to gather data, and performing operations on them when needed (such as returning the top 100 records or reducing the data to a single value, or the total income for a company over a given period). The gateway also plays a key role in supporting SQL syntax, allowing you to connect using any MySQL connector and send queries.
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(Kafka源码三)Kafka的缓存机制-CSDN博客

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By Callback callback, return appendResult, long availableMemory, int poolableSize
| CSDN
在Kafka的架构中，若没有缓存机制，在RecordAccumulator中对于不再使用的批次对象，需要进行回收，释放这些对象所占用的内存，为了降低GC的压力，Kafka作者设计了一个缓存池的机制，从而实现了实现消息批次的内存复用。本文主要讲解缓冲池的设计。 首先来看下kafka生产者到RecordAccumulator这边的架构流程 生产者发送消息的send方法会依次调用以下方法,首先通过场景驱动的方式来看看生产者的源码是如何通过append()方法将消息添加到batches的双端队列中，首先模拟三个线程（线程一，线程二，线程三）往同一个分区写入数据,执行append操作，假设每次都是线程一先获取到锁，通过synchronized分段加锁，三个线程都能成功的将消息插入batches中，并且成功的将所申请的内存空间释放掉。可以看出append方法为了保证线程的安全性以及并发能力，append方法不是在方法上直接加锁，而是在内部采用分段加锁的方式，进一步提高了并发能力，执行流程图如下 public Future<RecordMetadata>...
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弱引用回调引发的坑_xiaopangcame的博客-CSDN博客

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By Callback callback
| CSDN
在开发中，常常会用到回调模型，为了避免回调监听未被主动释放，导致内存泄露，我们会用到 WeakReference 来存放回调引用，然而要注意的是回调类被回收的坑。本文记录笔者开发中遇到弱引用回调被回收的坑及思考。 平常的一天，像往常一样敲着项目代码，今天要完成的需求是为我们的自定义 View 添加一个回调，当用户操作自定义 View 时，会回调指定的监听器。 很容易的一个需求，常规写法很快写出来了： 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 public class MyView extends LinearLayout { // 回调引用 private OnItemSelectedListener mListener; // 回调接口定义 public interface OnItemSelectedListener { void onSelect(String text); } // 设置回调 public void...
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详解Android Handler机制和原理

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By Looper.prepare wasn't called, Take A Callback, Callback callback
| Elecfans
Handler的使用 在Android开发中，Handler机制是一个很重要的知识点，主要用于消息通信。 Handler使用的三大步骤： 1、Loop.prepare()。 2、new一个Handler对象，并重写handleMessage方法。 3、Loop.loop()。 先运行实例代码观察现象，再深入分析内部原理。 publicclassLooperThreadextendsThread{ privatestaticfinalString TAG = LooperThread.class.getSimpleName(); privateHandler handler; @Override publicvoidrun(){ Looper.prepare(); handler = newHandler(Looper.myLooper(), newHandler.Callback() { @Override publicbooleanhandleMessage(@NonNull Message msg){ Log.d(TAG, "what: "+ msg.what + ",...
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6 个技术点带你理解 Kafka 高性能背后的原理

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By Callback callback, Timestamp Type timestampType, Long Segment BaseOffset, long logAppend Time
| itpub.net
来源：君哥聊技术 Kafka 是一款性能非常优秀的消息队列，每秒处理的消息体量可以达到千万级别。今天来聊一聊 Kafka 高性能背后的技术原理。 1 批量发送 Kafka 收发消息都是批量进行处理的。我们看一下 Kafka 生产者发送消息的代码： private Future<RecordMetadata> doSend(ProducerRecord<K, V> record, Callback callback) { TopicPartition tp = null; try { //省略前面代码 Callback interceptCallback = new InterceptorCallback<>(callback, this.interceptors, tp); //把消息追加到之前缓存的这一批消息上 RecordAccumulator.RecordAppendResult result = accumulator.append(tp, timestamp, serializedKey, serializedValue, headers,...
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C#句柄的操作（鼠标移动、键盘点击、复制粘贴）_c# 句柄的用法_五花肉.的博客-CSDN博客

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By BYTE bScan, Callback callback, uint dwFlags, uint wParam
| CSDN
--模拟键盘点击-- [DllImport("user32.dll",EntryPoint = "keybd_event",SetLastError = true)] public static extern void keybd_event(Keys bVk,byte bScan,uint dwFlags,uint dwExtraInfo); public static void CtrlAAndCtrlC() { Keybd_event(Keys.ControlKey,0,0,0); keybd_event(Keys.A,0,0,0); keybd_event(Keys.C,0,0,0); keybd_event(Keys.ControlKey,0,KEYEVENTF_KEYUP); } --鼠标移动到固定位置-- [DllImport("user32.dll")] public static extern int SetCursorPos(int x, int y); --鼠标点击-- [DllImport("user32.dll",EntryPoint =...
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