ソフトウェアエンジニアの技術ブログ：Software engineer tech blog

Performance
– Latency (Start -> Done)
– Throughput (# / Second)
Throughput = 1 / Latency

Benchmarks
– Programs and input data agreed upon for performance measurements

Benchmark suite
– Multiple programs
– Each representative of some type of app

Computer Architecture
Design a computer is well-suited for its purpose

Why do we need?
1.improve performance
2.improve ability

Fablication Technology, Circuit design

Active Power
P = 1/2 C * V^2 * f * α
capacitance, power supply, frequency, active factor

System simple_cs = {
	Component client = { Port send-request; Port err-trap; }
	Component server = { Port receive-request; Port alert; }
	Connector rpc = { Role caller; Role callee; }
	Connector err = { Role source; Role sink; }
	Attachment server.receive-request to rpc.callee;
	Attachment client-request to rpc.caller;
	Attachment client.err-trap to err.sink
	Attachment server.alert to err.source
}

The set of significant decisions about the organization of a software system, the selection of the structural elements and their interfaces by which the system is composed, together with their behavior as specified in the collaborations among those elements, the composition of these structural and behavioral element into progressively larger subsystems and the architectural style that guides organization: these elements and their interfaces, their collaborations, and their composition.

-Verhoff
The software architecture of a deployed software is determined by those aspects that are the hardest to change.

context LinesVisible inv:
	ViewPort : viewContents->size() =
	ViewPort : height.min(FileManager : document->size())

Displays Diagram

context LinesVisible inv:
	let topLineNumber = ScrollBar : handlePosition *
		FileManager : document->size()
	in ViewPort : viewContents = FileManager : document->
		subsequence(topLineNumber, topLineNumber + ViewPort: viewContents->size() - 1)

GUI toolkit(library) for textBrowser
-window
-scrollbar

File Manager
-some way to access the file’s contents
-provide a module that can retrieve a limited length, consecutive subsequence of the file’s lines.

ViewPort
-need to be able to display the textual content graphically

ScrollBar
-need to give the user some way to access different parts of the file

Use Cases
-three candidate structural elements
-behavior of the TextBrowser
-how the user will use the intended solution

Basic Concept: Why this application exist?
-> Re-text
– move handle
– change window(ViewPort) size

Analysis Model
– UML class-model diagram
– rectangle for classes
– Each rectangle is divided vertically
– Lines between the components denote relationships

Operation
– comprise those actions that the user can undertake to interact with the TextBrowser

“Having employed dozens of designers, I’ve never once taken into account a candidate’s academic qualification. I might take into account with design college, but I’m not swayed by the quality of degree.. I just know that too many good designers achieved poor grades at design school and it is always worth looking beyond academic marks.”
Adrian Shaughnessy