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beforeCreate After instance initialization, data observer and event/watcher event configurations are invoked. created Called immediately after instance creation is complete.In this step, the instance has completed the following configurations: data observer, operation of attributes and methods, and watch/eve ...

I. AQS Concept 1. Queue synchronizer is the basic framework for building locks or other synchronization components. It uses an int variable to represent the synchronization state, and completes the queuing of threads through built-in queues. 2. Following is the introduction of AQS in JDK8 document. 　　public abstract class AbstractQueuedS ...

Preface Path animation is a very useful way to achieve animation, using SVG can easily achieve the effect of path animation, but the version required by SVG is relatively high, many applications can not fully support it at present. The PathMeasure tool class provided in Android system can calculate the length of the path, get ...

Oracle Kernel Technology Disclosure_Lv Haibo's Learning Notes When Cache Buffers Chain(CBC) Latch is competing, there are two main situations: 1. Multiple incompatible processes apply for the same CBC Latch to access different Buffer Headers (BH) of different chain lists protected by this CBC Latch, which is called hot chain c ...

This article will show you how to achieve scaling and cropping effects such as pictures through code examples. Pictures can be used in two ways, one as a child element and the other as a background picture. In each application, image scaling can be roughly divided into the following situations: (1). Make sure that the picture is filled with el ...