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Event-Delegate mode is a more common design pattern, but the Java language itself does not encapsulate it in a certain way, so it is difficult to implement (it is easy to understand the rationale), by contrast. NET is much easier. As a Java enthusiasts, how to bow to such a small difficulty, but the internet search, but did not find the relevant solutions, have to do a package. In fact, the combination of examples is better, then I use a small example to draw out this design pattern. A class, th

. Saveaddress (address); Send an email to the supervisor to inform this is updated. SendEmail (address, email); void Saveaddress (string address) { //Save the address. // ... } void SendEmail (string address, string email) { //Send a email to inform the supervisor this is changed. // ... } Not good: //Save address and send a email to the supervisor to

谓异步是不需要等待被依赖的任务完成，只是通知被依赖的任务要完成什么工作，依赖的任务也立即执行，只要自己完成了整个任务就算完成了。 As to whether the dependent task is ultimately completed, the task that relies on it cannot be determined 所以它是不可靠的任务序列 .For example, for example, I go to the bank for business, there may be two ways: the first: choose to wait in line, the second: there is a VIP, receive a number, until the line to my this number by the counter to inform me my turn to handle the business; The first: the f

. addpropertychangelistener (listener );}/* Remove the listener object from the listener queue */Public void removepropertychangelistener (propertychangelistener listener ){If (Support = NULL ){Support = new propertychangesupport (this );}Support. removepropertychangelistener (listener );}Public void setname (string name ){String TMP = Name;This. Name = Name;/* Events that notify the listener of changing the property value of the current object of all events in the listener queue */Support. fire

(SNMPv2: Simple Network Management Protocol V2) SNMP is a standard protocol used to manage network nodes (servers, workstations, routers, switches, and hubs) in an IP network. It is an application layer protocol. SNMP enables network administrators to manage network performance, discover and solve network problems, and plan network growth. The Network Management System receives random messages (and event reports) through SNMP to learn about network problems.Currently, SN

create the RSA key for the CA certificate (in PEM format): OpenSSL genrsa-des3-out ca. key 1024 uses OpenSSL to create a CA certificate (in PEM format, if the validity period is one year): OpenSSL req-New-X509-days 365-key ca. key-out ca. CRT-config OpenSSL. cnfopenssl can generate CA certificates in der format. It is best to use IE to convert the CA certificates in PEM format to CA certificates in der format. Convert ca. Key from X509 to pfxpkcs12-export-in keys/client1.crt-inkey keys/client1.

1. A simple example of website Compression Public class servletdemo extends httpservlet {public void doget (httpservletrequest request, httpservletresponse response) throws servletexception, ioexception {string data = "too many errors have been reported before aaaaaaaa has been reported when there are too many errors have been reported when aaaaaaaa has been reported "; // find a buffer bytearrayoutputstream baos = new bytearrayoutputstream (); // compress the data to the buffer byte stream gzi

breaking it into different methods. The method name must be able to see what it does. Do not use a name that may cause misunderstanding. If the name is clear, you do not need to use documents to explain the functions of the method.Good:Void savephonenumber (string phonenumber){// Save the phone number.}Bad:// This method will save the phone number.Void savedata (string phonenumber){// Save the phone number.}One method only completes one task. Do not combine multiple tasks into one method, even

method, even if those tasks are very small.Good: // Save the address.SaveAddress ( address );// Send an email to the supervisor to inform that the address is updated.SendEmail ( address, email );void SaveAddress ( string address ){// Save the address.// ...}void SendEmail ( string address, string email ){// Send an email to inform the supervisor that the address is changed.// ...}Bad: // Save address and

Microsoft sees through all monitoring systems. Second, we will point out and emphasize the protection measures that users should take. Finally, we will inform you of Microsoft's unremitting efforts to cope with the current situation and protect users. in terms of the threat situation, we only learned a very limited number of attacks, these attacks are targeted at small subnets of enterprises. The attacks we have seen so far include public conceptu

displayed in the keychain.3. Export the private keyIn the keychain, select the private key when creating the CSR and export it as a VENDOR.P12 file.When you export, you are asked to set the private key password. Please remember this password.Note that if you use mdm_vendor_sign.py to sign a customer's CSR, you need to export the private key to the PEM format (. key file):OpenSSL pkcs12-in vendor.p12-nocerts-out Vendor.keyYou will be asked to enter 3 times password:vendor.p12 password, vendor.ke

After a day, Alpcs finally complete their ultimate intelligence system, the purpose of it are of course for ACM ...Now, KZC_TC, the head of the Intelligence Department (he code is once, and now 0), is sudden obtaining important infor Mation from one Intelligence personnel. That relates to the strategic direction and future development of the situation of ALPC. So it need-emergency notification to all Intelligence personnel, he decides-use the Intelligence system (KZC_TC inf ORM One, and the one

is, the laborer in writing to inform the employer should continue to work for at least 30 days, so that the employer timely arrangements to replace their work, maintain the continuity , to ensure the normal work order, to avoid the dissolution of the labor contract affect the enterprise's production and operation activities, to the employing units caused unnecessary losses. At the same time, this also enables workers to legalize labor contracts. Othe

upon to complete, the dependent task can be counted, this is a reliable task sequence. Either success succeeds, failure fails, and the state of the two tasks remains the same.The so-called asynchronous is not required to wait for the task to be relied upon to complete, but to inform the dependent task to complete what work, dependent on the task is also immediately executed, as long as the completion of their own complete task, even if completed. As

-distinguished Encoding Rules, open look is binary format, unreadable. View der Format certificate information: OpenSSL x509-in certificate.der-inform Der-text-nooutja VA and Windows servers tend to use this encoding format.Related file extensionsThis is a more misleading place, although we already know the two encoding formats Pem and Der, but the file extension is not necessarily called "Pem" or "Der", the common extensions in addition to PEM and De

5 seconds of accessing this page)(2) Enter in the Address barA value of private or must-revalidate will only access the server on the first visit and will no longer be accessed at a later time.The value is No-cache, which is accessed every time.A value of max-age, the access is not repeated until it expires.(3) Press Back buttonThe value is private, must-revalidate, Max-age, and is not re-accessed.A value of No-cache, which is repeatedly accessed every time(4) Press the Refresh buttonNo matter

Activitylifecyclecallbacks. As long as the interface is registered through the Registeractivitylifecyclecallbacks () method in the application, It provides the relevant activity lifecycle information in the application through Activitylifecyclecallbacks. The following table lists these interfaces and their purpose. Method prototypes Parameter description Use abstract void onactivitycreated (Activity activity,bundle savedinstancestate) Activity: An acti

observerPublic class Dog implements Observer {@ Overridepublic void response () {System. out. println ("the cat is calling to notify the Dog to run quickly ...... ");}}Mouse. java is also one of the observers.Public class Mouse implements Observer {@ Overridepublic void response () {System. out. println ("the Mouse is notified to run quickly ...... ");}}Client. java registers the observer and target notificationPublic class Client {public static void main (String [] args) {Cat cat = new Cat ();

minutes13. Design and implementation of reliable message service--message recovery subsystem 13 minutes14. Design and implementation of reliable message service--real-time message service subsystem 28 minutes15, Reliable message final consistency scheme in the payment system of practical application introduction 47 minutes16, reliable message final consistency scheme in the payment system of practical application deployment 38 minutes17, Reliable message final consistency scheme in the payment

processor while waiting for an event to occur and is in a blocked state. There can be many events that cause a process to block, for example, waiting for I/o completion, application buffer not satisfied, waiting for letter (signal), etc.**synchronous and asynchronous so-called synchronization is the completion of a task to rely on another task, only wait for the dependent task to complete, the dependent task can be counted, this is a reliable task sequence. Either success succeeds, failure fail