made a huge step forward, and has the ability to "return data". If both have the ability to "send data, you don't have to make a detour through the lame techniques any more. In PHP, you can use the send () interface of Generator (Note: it is no longer the next () Interface) to complete the "send data" task, thus achieving real "two-way communication ".
function gen() { $ret = (yield 'yield1'); echo "[gen
to List
Here I put the source code for my study for N days, but I can understand the estimation is not much, I can use it directly:
Using System;
Using System. Collections. Generic;
Using System. Text;
Using System. Reflection. Emit;
Using System. Reflection;
Using CYQ. Data. Table;
Namespace CYQ. Data. Tool{/// /// Quick conversion class [the larger the data volume [about 500], the higher the performance]/// Internal class FastToT {Public delegate T EmitHandle (MDataRow row );/// /// Constr
Memory management and garbage collection are critical points for the JVM, and it is important to understand the basic strategies of memory management and garbage collection for the analysis of Java performance. This article describes the memory management and garbage collection of Sun JVM 6.0.1. Memory ManagementIn the process of running the program, will create a large number of objects, these objects, mostly short-period objects, a small part of the long-period objects, for short-cycle objects
Transferred from https://my.oschina.net/fhd/blog/289945
Examples are as follows:
Package test;
public class Gen
Package test; public class Gendemo {public static void main (string[] args) {* * in Java7 and later versions, the generic type can be omitted from the constructor, as in the following
In this way, * only a pair of angle brackets
Let's analyze some of the code in the example above.
First, notice how this line of code declares the gener
Memory Management and garbage collection are critical aspects of JVM. For Java performance analysis, it is very important to understand the basic memory management and garbage collection policies. This article describes Sun JVM 6.0 memory management and garbage collection.
1. Memory ManagementDuring the program running, a large number of objects are created. Most of these objects are short-lived objects and a small part are long-lived objects. For short-lived objects, garbage collection needs to
old according to the life cycle, according to the result of the statistic distribution law, the new and old regions can adopt different recycling strategies and algorithms, strengthen the recovery and processing intensity of the new region, and strive for the short time interval, the smaller memory area, At a lower cost, a large number of newly discarded local objects on the execution path are reclaimed in a timely manner. Hypothetical prerequisites for the generational algorithm:1, a large num
Yield command. You can pause a function and return intermediate results. The function that uses this command will save the execution environment and restore it if necessary.
The generator is more powerful and complex than the iterator, so it takes some time to understand it.
See the following code:
[Python]Def gen ():For x in xrange (4 ):Tmp = yield xIf tmp = 'hello ':Print 'World'Else:Print str (tmp)
Def gen
new and old according to the life cycle, according to the result of the statistic distribution law, the new and old regions can adopt different recycling strategies and algorithms, strengthen the recovery and processing intensity of the new region, and strive for the short time interval, the smaller memory area, A large number of newly discarded local objects on the execution path that are not used at a lower cost are promptly reclaimedHypothetical prerequisites for the generational algorithm:1
For the implementation of hotspot Vm, there are only two types of GC in it:
Partial GC: does not collect the entire GC heap Mode
Young GC: Only GC of young gen is collected.
Old GC: Only GC of Old Gen is collected. Only the concurrent collection of CMS is in this mode.
Mixed GC: Collect GC of the entire young Gen and some old
How to manage the log (Redolog file) group in a RAC environment
Tuesday, 2004-09-14 11:52 eygle
Original connection:
Http://www.eygle.com/faq/How.To.Mangement.redologfile.in.Rac.Raw.htm
This article briefly describes how to manage log files in a RAC raw device environment (Redolog file)
This article environment: Oracle9i RAC + VCS4.0 + VxVM4.0 + Solaris9.0 + SunFire210
1. You can first view the current raw equipment situation
# vxprintdisk group:oradgty NAME ASSOC kstate LENGTH ploffs St
Find a simple PHP regular match.
[Anime colleagues] Pokemon Black... text 22nd... 2826/18/0 Ding 13-08-29
[Youth campus] Snow float in those years... the text is sincere. .. 202/5/0 renasha 13-08-29
In the above code, I only want the URL in the same format. How to write this regular expression.
I wrote the following,
$ Html = file_get_contents ($ s
about Color
1, Colorfavs
Website address: http://www.colorfavs.com
Colorfavs is mainly used to upload images and get image color, it interface design concise, you can browse excellent color collocation, there is a collection of color scheme function, you can drag and drop upload image capture color matching, easy to operate.
2, Uigradients
Website address: http://uigradients.com/
Uigradients is a professional gradient sharing site, there are nearly hundreds of rich gradient col
= gen_generator() print ret, type(ret) #
ret = gen_value() print ret, type(ret) # 1
From the code above, we can see that,gen_generatorThe function returns a generator instance.
Generator has the following special features:
• Following the iterator protocol, the iterator protocol needs to be implemented__iter__ , Next interface
• It can be accessed multiple times and returned multiple times to pause code execution in the function body
The test code is as follows:
>>> Def gen_
After tornado's coroutine was released, the coroutine concept was enhanced. in asynchronous programming, the original gen. engine was replaced and changed to the current gen. coroutine. The decorator was originally designed to simplify asynchronous programming in tornado. Avoid writing callback functions to make development more in line with normal logic thinking. A simple example is as follows:
Class Mai
In Evenlist) squarelist. Add (I * I ); Return Squarelist ;}
Theoretically, this method is indeed inferior to the following:
StaticListInt> Evensquarefast (IenumerableInt> Source ){ListInt> Result =NewListInt> ();Foreach(VaRIInSource ){If(I % 2 = 0) result. Add (I * I );}ReturnResult ;}
In the second method, you can filter data directly in a traversal and convert the data directly. The first write method divides the method into two steps based on the "function description". Filter and c
reason on by reducing the number of places where a context switch can happen.The code for the co-process is almost as simple as synchronizing the code, but without the overhead of the thread. And the co-process makes concurrency easier because it reduces context-switching scenarios.Review the Code of the co-process again from tornado import Gen@gen.coroutine def Fetch_coroutine (URL): http_client = Asynchttpclient () response = yield Http_c
Installing Tornado
Easy to use Grequests library directly, the following is the tornado of the asynchronous client. Asynchronously used the tornado, based on an example of an official document, to get a simple asynchronous crawler. You can refer to the latest documentation under learning.
Pip Install Tornado
Asynchronous crawler
#!/usr/bin/env python#-*-coding:utf-8-*-import timefrom datetime import timedeltafrom Tornado import httpclient, Gen, I O
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