Oracle ASM (Automatic Storage Management System) is a database file storage management system officially provided by oracle. Compared with other file storage systems, AMS has specific advantages in load balancing, performance optimization, and redundancy protection. Currently, ORACLE recommends that the database use AMS to store the corresponding files of the database. In 11g RAC mode, you can only use ASM
Android4.4 Component Analysis-service component-bindService source code analysis, android4 major components6.1.1. bindService
Because the code implementation process of startService is analyzed earlier, the Code Analysis of bindService is not described in detail. When introducing the process, you should pay more attention to some details.
First, bindService also uses ContextWrapper. bindService to bindService of ContextImpl, and then bindServiceCommon. Note that the incoming ServiceConnection i
The actionmessage function is: Used to generate struts messages including normal messages and error messages. Note (the original actionerror method is used to generate an error message, but it is obsolete, but still usable .) For example, actionmessage (Key, object), where key is the key value in APPICATION. properties. Object is the parameter to be passed in the message. Dynamic Input is implemented here. If you want to pass multiple parameters, the object can be changed to an array.
Actionme
of such basic services. The architecture is as follows:Overview of ResourceManager High AvailabilityRm ha and nn ha have many similarities (NameNode HA configuration details ):(1 ).Active/Standby architecture. Only one RM is Active at a time, as shown in ).(2 ).Depends on zooKeeper implementation. Manually switch to the yarn rmadmin command (similar to the hdfs haadmin command), while ZKFailoverController is used for automatic failover. But the difference is that zkfc is started only as a threa
First, add the following code to the first page of the blog Park's HTML:Scripttype= "Text/x-mathjax-config">MathJax.Hub.Config ({tex2jax: {inlinemath: [['$','$'], ['\\(','\\)']], Processescapes:true},tex: {equationnumbers: {autoNumber: ["AMS"], Uselabelids:true } }, "Html-css": {linebreaks: {automatic:true}, Scale: -}, SVG: {linebreaks: {automatic:true } }});Script>Scripttype= "Text/javascript"src= "Https://c
APK program Running ProcessFirst, Activitythread begins execution from the main () function, calling Preparemainlooper () to create a message queue (MessageQueue) for the UI thread.A Activitythread object is then created, and an H (Handler) object and a Applicationthread (Binder) object are created in the initialization code of the Activitythread. Where Binder is responsible for receiving IPC calls from the remote AMS, and when the call is received, t
manual failover and automatic failover, can be achieved through an integrated failover controller, either through the CLI Input command or with an automatic failover boot.In the case where automatic failover is not enabled, the administrator must manually convert one of the RMS in the standby state to the active state. Manual failover must first convert the original active RM to the standby state, and then convert a standby RM to active with the following command: Yarn rmadmin. In terms of auto
classes need to understand, otherwise the APK process will be analyzed confusedThe core classes are described belowIn particular, Decorview, in the client program first processing the message is Decorview2 APK program running processFirst from Activitythread's main ()-->activitythread-->uiloop Loop processing (green section), but behind each step there is a detailed process such as the yellow part, the process(1) First activitythread the main () execution, call Preparemainlooper () to create a
", NULL, "System_server", NULL, null,429 subject, NULL, stack, NULL) ; 430 }431 };432 dropboxthread.start (); 433 try {434 dropboxthread.join (+) ; Wait up to 2 seconds for it to return.435 } catch (Interruptedexception ignored) {}Dropboxmanagerservice is added in Systemserver's startotherservices (), the default storage path for the information is/data/system/dropbox. Dropboxmanager
On the android unlock page, plug in USB to open the USB storage settings page. Press the HOME Key/Return key to directly return to launcher, instead of sliding the screen lock page.1) If you disable setting -- developer options -- USB debugging disable, it indicates that the current user mode is used, and USB is inserted under the screen lock interface, AMS calls the USB storageactivity "Open USB storage device" interface.2) The UsbStorageActivity int
Activity Management Mechanism
The article only records your understanding for future reference.
AMS manages four major components and processes. The largest of them is Activity.
1. ActivityStack is divided into two types in AMS, one of which is FrontStack and the other is the opposite.
boolean isFrontStack(ActivityStack stack) { return !(stack.isHomeStack() ^ getFocusedStack().isHomeStack());
files are generated. Autoconf is used to generate configure through configure. ac, while automake is used to generate Makefile. ins through Makefile. ams and configure. ac. We should at least know how to manually create it in the correct order. Let's show you a picture to help you understand.Description of configure. ac configuration in amhello'sLet's review configure. ac:AC_INIT ([amhello], [1.0], [bug-automake@gnu.org])AM_INIT_AUTOMAKE
About ANR
ANR, is the abbreviation for "Application Not Responding", which is "application unresponsive". In Android, Activitymanagerservice (AMS) and Windowmanagerservice (WMS) Monitor the response time of the application, If the application main thread (that is, the UI thread) has not finished processing the input event during the timeout period, or if a particular operation has not been performed, the ANR will appear. The anr,android gener
way, other applications or services can invoke the native system service through the binder mechanism.Of course, we can also develop a native system service to implement its binder interface, so that the service can be invoked by other applications or services on the native layer.If the native system service we develop wants to be available to Java-tier applications, it is necessary to implement a Java interface and then invoke native system services through JNI.Java System ServicesWritten by t
Selected from the Anatomy of Android kernelThe framework defines the client component and the server-side component functions and interfaces. Contains 3 main parts: Server side, client and Linux driver.(a) service-sideThe server consists of two major classes, Windowmanagerservice (WMS) and Activitymanagerservice (AMS). The role of the WMS is to assign Windows to all applications and manage those windows. This includes assigning window sizes, adjusting
the 第50-70 Zhang when the oom memory has been soaring, the fundamental recovery, do not believe you try, compression and recovery can not cure the problem, then how to solve it? Research and Weibo, how they will not oom, and finally I think of a solution.II. Implementation of the programme1. Common practice in the pastPart of the code:listClass Myadapter extends Pageradapter {@Override public int getcount () {return mdatas.size (); } @Override Public Boolean isviewfromobject (view view, Object
also needs a handler to interact with the message queue, which is ActivityThread.H, which defines a set of message types, including the start and stop processes of the four main components.Activitythread inter-process communication through Applicationthread and AMS, AMS completes Activitythread request callback Applicationthhread Binder method in the way of interprocess communication, Then Applicationthrea
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