guava ordering

Introduction The Ratelimiter class is available in the Google Guava library, which is often used to limit the rate of access to some physical or logical resources. Compared to Semaphore, Semaphore limits the number of concurrent accesses rather than the usage rate. The Ratelimiter class is defined as follows: Com.google.common.util.concurrent.RateLimiter @ThreadSafe @Beta public abstract class Ratelimiter extends Object

Guava eventbus code analysis (1), guavaeventbus Before analyzing guava eventbus, let's take a look at the traditional observer mode: The Subject interface is an abstract topic, which is equivalent to an observer. It holds a list of listener observers. The attach method registers the listener in this list, and the detach method deregisters the listener, Y method is used to notify the listener in the list wh

. DelayQueue is actually an encapsulation of a priority queue. Early tasks have a higher priority. It is mainly used to run tasks after a given delay, or regularly execute tasks. ScheduledThreadPoolExecutor features similar to Timer, but ScheduledThreadPoolExecutor is more flexible than Timer, and multiple background threads can be specified in the constructor. Future interface and ListenableFurture Interface The Future interface provides a stub (stub) for the asynchronous computing result re

Google's Guava is an artifact added to the JDK, and deserves to be studied well.Access restrictions for general web systems can be implemented using the container itself, such as Tomcat, which can be configured with a limit of connection number on the connector, and the servlet thread limit.Sometimes the system is complicated and wants to provide different ratelimiter for different services, such as the higher rate of database operation, the rate at w

Object.hashcode (). In short, the Bloom filter is a probabilistic data structure that allows you to detect whether an object is definitely not in the filter, or it may have been added to the filter. This is a comprehensive introduction to the Bloom Filter Wiki page, and we recommend a tutorial on GitHub.The Guava Hash pack has an built-in bloom filter implementation that you can use as long as you provide funnel. You can get bloomfilterBloomfilterHas

Today, we will talk about the multi-dataset data structure in the guava class library. Although it is not often used, it is necessary to discuss it. We know that the set in the Java class library cannot store the same elements, and the elements in the class are unordered. The list can store the same elements in sequence. The current multi-dataset can store the same elements, but the order between elements is unordered. We can also see from this that m

Package com.google.common.base;Guava source of the method of this class introduction only one sentence:Utility methods for working with {@link Enum} instances.This means the tool method that is provided to the enum instance.What is an enumeration?Enumerations are simply a type of data, except that the data type contains only custom specific data, which is a set of data that has a common attribute.For example, a color can also be defined as an enumerat

Guava is Google's Java class Library, the function is very powerful, the following is the local memory Cache tool class instance, the first time by calling get (key), will call load to get the value, when called again, we find that it is called directly from the cache, according to MaximumSize set the cache size, When the size exceeds the limit, the furthest data is removed from the cache. Examples are as follows.Guava Cahche instance, through Loading

Java built-in ignores empty content, guava splitter is not ignored. Or you can freely choose to ignore. /** * {@code Splitter}和{@code Joiner} 这两个对于map的相反的操作，在web框架例如spring mvc中用到过． * * 对于get　url后面的参数和pos　form中前端参数的连接和后端的拆分都有用到．每个框架的处理思维是一样的． * * @author doctor * * @since 2015年3月14日 下午9:00:17 */．．．．．．．．．．．．．．　　@Test public void test_string_split() { String[] split = "a,b,,".split(","); // java内置的会忽略空内容 assertThat(split, equalTo(Lists

Reprint: https://my.oschina.net/realfighter/blog/349821The object class in Java is a superclass of all Java classes (that is, ancestors), all objects implement methods in the object class, and in daily work, we often need to rewrite several of them, such as equals, toString, hashcode, and so on, while at work , we implement these methods are sometimes more painful, such as the Equals method to judge non-null, the ToString debugging information is incomplete, etc., in

In the previous article "Multimap of Guava learning", we talked about Multimap In the Guava class library, which features that key-value pairs in Multimap can be unique. We know that, there is a Map in the Java Collection class library, which features that the stored Key is unique, and the Value can be unique. If we need a Key) each Value is unique. How can this problem be solved? This is the BiMap structur

In RangeSet of Guava learning, we talked about the features and usage of RangeSet. There are many differences between RangeMap and RangeSet.On the official API of Google Guava, we can know that RangeMap is a collection type that does not intersection and is not an empty Range (key) map to a Value ). Unlike RangeSet, RangeMap cannot merge adjacent intervals even if the ing value is the same.Like RangeSet, Ra

It is believed that many people began to use the JDK Library to operate the file, the tedious duplication of code is disgusting, of course, this is the reason for the various libraries. The next introduction to the files class of guava provides a great simplification of file operations, such as the ability of a programmer to switch off a stream without worrying about it at all.This paper describes the basic operation of files such as copying, renaming

Guava Chinese is the meaning of pomegranate, this project is an open source project of Google, contains many Google Core Java Common library. Currently mainly includes: Com.google.common.annotations Com.google.common.base Com.google.common.collect Com.google.common.io Com.google.common.net Com.google.common.primitives Com.google.common.util.concurrentOnline API Doc:http://tool.oschina.net/apidocs/apidoc?api=

Guava Preconditions tool parameter pre-check, guavapreconditions Preconditions is a tool class provided by guava for code verification. It provides many important static verification methods. It is used to simplify code verification or preprocessing in our work or development. It verifies the rationality before the logic starts to avoid data errors caused by too deep parameter input. In addition, we can acc

Google guava basic tools and googleguava tools Recently, I used the google cache in the project to learn about some tool classes in guava and the operations on the set. The packages are compared and I don't have time to write them myself. I will mark them first, The reference document is as follows: Http://macrochen.iteye.com/blog/737058 Http://my.oschina.net/indestiny/blog/214668 What is Google

. Data; Import Lombok. Noargsconstructor, @Data @noargsconstructor@allargsconstructor@builderpublicclass guavadto { private Integer ID; Private String name;}Implementation class of 5.GuavaServiceImpl PackageCom.zy;Importorg.springframework.cache.annotation.Cacheable; Public classGuavaserviceimpl {//Spring EL//guavadto Common DTO//@Cacheable (value = "Guava", key = "' Testguavacache: ' + #guavaDTO. ID + #guavaDTO. Name") //value is the name

Simple online o2o ordering and online o2o ordering. Simple o2oordering on the Internet, o2oordering files.cnblogs.commin-c?aimai.rar any bugs or problems, please remember to leave a message for me. I mainly use PHP to develop simple online o2o ordering and online o2o ordering. Http://files.cnblogs.com/min-cj/waimai.

guava-19.0 google-collections-1.0 have Immutableset class, package path is also consistent, the former has copyOf (Collection)?First, the application error:Ii. SolutionsConfigurations.all {Exclude module: ' Logback-core 'Exclude module: ' Logback-classic 'Exclude module: ' Google-collections '}Third, restart the applicationComparing pre-and post-generated dependenciesGradlew Dependencies > Dependsx.txtNo Google-collections-1.0.jar.Problem Solving!Api-

Guava is the ice cream (essence) on the Java API cake.a simple description of the source package:Com.google.common.annotations: Common annotation type.Com.google.common.base: Basic tool class libraries and interfaces.Com.google.common.cache: Caching toolkit, a very easy-to-use and powerful in-JVM cache.Com.google.common.collect: A collection interface with generics extension and implementation, as well as tool classes, where you'll find lots of fun co