Lecture on "QoS in Web Services" - Master course
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The document discusses the quality of service (QoS) lifecycle for web services. It covers searching for existing web services, building new services from scratch, selecting between existing services based on non-functional capabilities like response time, availability and cost, and establishing service level agreements (SLAs) between service providers and consumers. SLAs define aspects like service description terms, guarantees, scope, qualifying conditions, service level objectives and business value. Monitoring is important for ensuring SLAs are met and can involve online testing of services or passive monitoring of real user requests.
![void processNextStep() {
boolean isBorderTouched = false;
// Generate new location of snake head.
int newHeadLocX = (int) snakeBodyPart[0].getLocation().getX() + directionX;
int newHeadLocY = (int) snakeBodyPart[0].getLocation().getY() + directionY;
// Most last part of the snake is food.
int foodLocX = (int) snakeBodyPart[totalBodyPart - 1].getLocation().getX();
int foodLocY = (int) snakeBodyPart[totalBodyPart - 1].getLocation().getY();
// Check does snake cross the border of the board?
if (newHeadLocX >= BOARD_WIDTH - SNAKE_BODY_PART_SQURE) {
newHeadLocX = 0;
isBorderTouched = true;
} else if (newHeadLocX <= 0) {
newHeadLocX = BOARD_WIDTH - SNAKE_BODY_PART_SQURE;
isBorderTouched = true;
} else if (newHeadLocY >= BOARD_HEIGHT - SNAKE_BODY_PART_SQURE) {
newHeadLocY = 0;
isBorderTouched = true;
} else if (newHeadLocY <= 0) {
newHeadLocY = BOARD_HEIGHT - SNAKE_BODY_PART_SQURE;
isBorderTouched = true;
}
// Check has snake touched the food?
if (newHeadLocX == foodLocX && newHeadLocY == foodLocY) {
// Set score.
score += 5;
scoreViewer.setText("Score==>" + score);
// Check bonus food should be given or not?
if (score % 50 == 0 && !isBonusFoodAvailable) {
createBonusFood();
}
// Create new food.
createFood();
}
// Check has snake touched the bonus food?
if (isBonusFoodAvailable &&
pointOfBonusFood.x <= newHeadLocX &&
pointOfBonusFood.y <= newHeadLocY &&
(pointOfBonusFood.x + SNAKE_BODY_PART_SQURE) >= newHeadLocX &&
(pointOfBonusFood.y + SNAKE_BODY_PART_SQURE) >= newHeadLocY) {
board.remove(bonusfood);
score += 100;
scoreViewer.setText("Score ==>" + score);
isBonusFoodAvailable = false;](https://image.slidesharecdn.com/presentacionsoa-miri-140123030028-phpapp01/85/Lecture-on-QoS-in-Web-Services-Master-course-54-320.jpg)
![void processNextStep() {
boolean isBorderTouched = false;
// Generate new location of snake head.
int newHeadLocX = (int) snakeBodyPart[0].getLocation().getX() + directionX;
int newHeadLocY = (int) snakeBodyPart[0].getLocation().getY() + directionY;
// Most last part of the snake is food.
int foodLocX = (int) snakeBodyPart[totalBodyPart - 1].getLocation().getX();
int foodLocY = (int) snakeBodyPart[totalBodyPart - 1].getLocation().getY();
// Check does snake cross the border of the board?
if (newHeadLocX >= BOARD_WIDTH - SNAKE_BODY_PART_SQURE) {
newHeadLocX = 0;
isBorderTouched = true;
} else if (newHeadLocX <= 0) {
newHeadLocX = BOARD_WIDTH - SNAKE_BODY_PART_SQURE;
isBorderTouched = true;
} else if (newHeadLocY >= BOARD_HEIGHT - SNAKE_BODY_PART_SQURE) {
newHeadLocY = 0;
isBorderTouched = true;
} else if (newHeadLocY <= 0) {
newHeadLocY = BOARD_HEIGHT - SNAKE_BODY_PART_SQURE;
isBorderTouched = true;
}
// Check has snake touched the food?
if (newHeadLocX == foodLocX && newHeadLocY == foodLocY) {
// Set score.
score += 5;
scoreViewer.setText("Score==>" + score);
// Check bonus food should be given or not?
if (score % 50 == 0 && !isBonusFoodAvailable) {
createBonusFood();
}
// Create new food.
createFood();
}
// Check has snake touched the bonus food?
if (isBonusFoodAvailable &&
pointOfBonusFood.x <= newHeadLocX &&
pointOfBonusFood.y <= newHeadLocY &&
(pointOfBonusFood.x + SNAKE_BODY_PART_SQURE) >= newHeadLocX &&
(pointOfBonusFood.y + SNAKE_BODY_PART_SQURE) >= newHeadLocY) {
board.remove(bonusfood);
score += 100;
scoreViewer.setText("Score ==>" + score);
isBonusFoodAvailable = false;
Monitoring code
Monitoring code
Monitoring code](https://image.slidesharecdn.com/presentacionsoa-miri-140123030028-phpapp01/85/Lecture-on-QoS-in-Web-Services-Master-course-55-320.jpg)
![void processNextStep() {
boolean isBorderTouched = false;
// Generate new location of snake head.
int newHeadLocX = (int) snakeBodyPart[0].getLocation().getX() + directionX;
int newHeadLocY = (int) snakeBodyPart[0].getLocation().getY() + directionY;
// Most last part of the snake is food.
int foodLocX = (int) snakeBodyPart[totalBodyPart - 1].getLocation().getX();
int foodLocY = (int) snakeBodyPart[totalBodyPart - 1].getLocation().getY();
// Check does snake cross the border of the board?
if (newHeadLocX >= BOARD_WIDTH - SNAKE_BODY_PART_SQURE) {
newHeadLocX = 0;
isBorderTouched = true;
} else if (newHeadLocX <= 0) {
newHeadLocX = BOARD_WIDTH - SNAKE_BODY_PART_SQURE;
isBorderTouched = true;
} else if (newHeadLocY >= BOARD_HEIGHT - SNAKE_BODY_PART_SQURE) {
newHeadLocY = 0;
isBorderTouched = true;
} else if (newHeadLocY <= 0) {
newHeadLocY = BOARD_HEIGHT - SNAKE_BODY_PART_SQURE;
isBorderTouched = true;
}
// Check has snake touched the food?
if (newHeadLocX == foodLocX && newHeadLocY == foodLocY) {
// Set score.
score += 5;
scoreViewer.setText("Score==>" + score);
// Check bonus food should be given or not?
if (score % 50 == 0 && !isBonusFoodAvailable) {
createBonusFood();
}
// Create new food.
createFood();
}
// Check has snake touched the bonus food?
if (isBonusFoodAvailable &&
pointOfBonusFood.x <= newHeadLocX &&
pointOfBonusFood.y <= newHeadLocY &&
(pointOfBonusFood.x + SNAKE_BODY_PART_SQURE) >= newHeadLocX &&
(pointOfBonusFood.y + SNAKE_BODY_PART_SQURE) >= newHeadLocY) {
board.remove(bonusfood);
score += 100;
scoreViewer.setText("Score ==>" + score);
isBonusFoodAvailable = false;
Monitoring code
Monitoring code
Monitoring code](https://image.slidesharecdn.com/presentacionsoa-miri-140123030028-phpapp01/85/Lecture-on-QoS-in-Web-Services-Master-course-57-320.jpg)
![void processNextStep() {
boolean isBorderTouched = false;
// Generate new location of snake head.
int newHeadLocX = (int) snakeBodyPart[0].getLocation().getX() + directionX;
int newHeadLocY = (int) snakeBodyPart[0].getLocation().getY() + directionY;
// Most last part of the snake is food.
int foodLocX = (int) snakeBodyPart[totalBodyPart - 1].getLocation().getX();
int foodLocY = (int) snakeBodyPart[totalBodyPart - 1].getLocation().getY();
Monitoring code
// Check does snake cross the border of the board?
if (newHeadLocX >= BOARD_WIDTH - SNAKE_BODY_PART_SQURE) {
newHeadLocX = 0;
isBorderTouched = true;
} else if (newHeadLocX <= 0) {
newHeadLocX = BOARD_WIDTH - SNAKE_BODY_PART_SQURE;
isBorderTouched = true;
} else if (newHeadLocY >= BOARD_HEIGHT - SNAKE_BODY_PART_SQURE) {
newHeadLocY = 0;
isBorderTouched = true;
} else if (newHeadLocY <= 0) {
newHeadLocY = BOARD_HEIGHT - SNAKE_BODY_PART_SQURE;
isBorderTouched = true;
}
Monitoring code
// Check has snake touched the food?
if (newHeadLocX == foodLocX && newHeadLocY == foodLocY) {
// Set score.
score += 5;
scoreViewer.setText("Score==>" + score);
// Check bonus food should be given or not?
if (score % 50 == 0 && !isBonusFoodAvailable) {
createBonusFood();
}
// Create new food.
createFood();
}
Monitoring code
// Check has snake touched the bonus food?
if (isBonusFoodAvailable &&
pointOfBonusFood.x <= newHeadLocX &&](https://image.slidesharecdn.com/presentacionsoa-miri-140123030028-phpapp01/85/Lecture-on-QoS-in-Web-Services-Master-course-58-320.jpg)
Lecture on "QoS in Web Services" - Master course
- 2. Search for existing ones Web Service Fr om s c r a t c h
- 3. not There are many web services with the same NonFunctional capabilities
- 8. 0.42 s 99.65% 0$ 0.31 s 99.45% 0$ 0.55 s 96.75% 5$ 0.28 s 99.91% 2.5 $ 1.22 s 95.05% 1.5 $ Service selection
- 15. WS-Agreement SLA standard (in the academia) Service Level Agreements
- 17. Name, id Service Level Agreements
- 18. Name, id Context Service Level Agreements
- 19. Name, id Context Terms: Service Level Agreements
- 20. Name, id Context Terms: - Service description terms Las presentes condiciones generales regulan los Servicios Telemáticos Financieros indicados en las condiciones particulares (en adelante, “el Servicio”), así como el procedimiento de utilización del mismo por el Titular para la realización de las operaciones que integren en cada momento el Servicio. Los Servicios Telemátios Financeros a los que el titular puede accedir quedan establecidos en la relación contendia en las Condiciones Particulares del presente contrato. Los Servicios Telemáticos Financieros ofrecidoos podran ser modificados por el Titular en cualquier momento, Service Level Agreements
- 21. Name, id Context Terms: - Service description terms Las presentes condiciones generales regulan los Servicios Telemáticos Financieros indicados en las condiciones particulares (en adelante, “el Servicio”), así como el procedimiento de utilización del mismo por el Titular para la realización de las operaciones que integren en cada momento el Servicio. Los Servicios Telemátios Financeros a los que el titular puede accedir quedan establecidos en la relación contendia en las Condiciones Particulares del presente contrato. Los Servicios Telemáticos Financieros ofrecidoos podran ser modificados por el Titular en cualquier momento, - Guarantee terms Podrá establecer límites de disposición para operaciones que impliquen disponibilidad o movimiento de fondos, límites que podran ser de distintos importes en función del Servicio Telematico Financiero a través del que se opere. Podrá modificar estos límites de disposicion cuando lo estime necesario, prévia comunicación al titular que podrá realizarse a través del propio Servicio Telemático Service Level Agreements
- 22. Guarantee terms Service scope Qualifying condition Service Level Objective Business value List Service Level Agreements
- 23. Guarantee terms Service scope Qualifying condition Service Level Objective Business value List Service Level Agreements
- 24. Guarantee terms Service scope Qualifying condition Service Level Objective Business value List Service Level Agreements
- 25. Guarantee terms Service scope Qualifying condition Service Level Objective Business value List Service Level Agreements
- 26. Guarantee terms Service scope Qualifying condition Service Level Objective Business value List Service Level Agreements
- 27. Name, id Context Terms: - Service description terms Las presentes condiciones generales regulan los Servicios Telemáticos Financieros indicados en las condiciones particulares (en adelante, “el Servicio”), así como el procedimiento de utilización del mismo por el Titular para la realización de las operaciones que integren en cada momento el Servicio. Los Servicios Telemátios Financeros a los que el titular puede accedir quedan establecidos en la relación contendia en las Condiciones Particulares del presente contrato. Los Servicios Telemáticos Financieros ofrecidoos podran ser modificados por el Titular en cualquier momento, - Guarantee terms Podrá establecer límites de disposición para operaciones que impliquen disponibilidad o movimiento de fondos, límites que podran ser de distintos importes en función del Servicio Telematico Financiero a través del que se opere. Podrá modificar estos límites de disposicion cuando lo estime necesario, prévia comunicación al titular que podrá realizarse a través del propio Servicio Telemático Service Level Agreements
- 28. Self Adaptive Service Based Systems
- 29. Web service Web service Web service Database Web service Self Adaptive Service Based Systems
- 30. Web service Web service Web service Database Web service Self Adaptive Service Based Systems
- 31. Web service Web service ! Web service Web service Database Web service Self Adaptive Service Based Systems
- 32. Web service Web service Web service ! Web service Web service Database Web service Self Adaptive Service Based Systems
- 33. Challenges Method_x Param 1, Param 2, ... param N ≠ Method_y Param 1, Param 2, ... Param M Self Adaptive Service Based Systems
- 34. Challenges Self Adaptive Service Based Systems
- 35. Monitor
- 38. Online testing
- 41. Online testing
- 42. The malfunction of a service can be detected before the user tries to use it Online testing
- 43. You can control the number of measurements per time Online testing
- 44. You can test the behaviour of the system at stressful situations Online testing
- 46. You get the QoS of real requests Passive monitoring
- 47. it’s less intrusive Passive monitoring
- 48. Can get the QoS of more services: stateful and non-free services Passive monitoring
- 49. How do they work?
- 53. client Code Client engine Service messages Monitors inside the code Passive monitoring Service Engine Service Code
- 54. void processNextStep() { boolean isBorderTouched = false; // Generate new location of snake head. int newHeadLocX = (int) snakeBodyPart[0].getLocation().getX() + directionX; int newHeadLocY = (int) snakeBodyPart[0].getLocation().getY() + directionY; // Most last part of the snake is food. int foodLocX = (int) snakeBodyPart[totalBodyPart - 1].getLocation().getX(); int foodLocY = (int) snakeBodyPart[totalBodyPart - 1].getLocation().getY(); // Check does snake cross the border of the board? if (newHeadLocX >= BOARD_WIDTH - SNAKE_BODY_PART_SQURE) { newHeadLocX = 0; isBorderTouched = true; } else if (newHeadLocX <= 0) { newHeadLocX = BOARD_WIDTH - SNAKE_BODY_PART_SQURE; isBorderTouched = true; } else if (newHeadLocY >= BOARD_HEIGHT - SNAKE_BODY_PART_SQURE) { newHeadLocY = 0; isBorderTouched = true; } else if (newHeadLocY <= 0) { newHeadLocY = BOARD_HEIGHT - SNAKE_BODY_PART_SQURE; isBorderTouched = true; } // Check has snake touched the food? if (newHeadLocX == foodLocX && newHeadLocY == foodLocY) { // Set score. score += 5; scoreViewer.setText("Score==>" + score); // Check bonus food should be given or not? if (score % 50 == 0 && !isBonusFoodAvailable) { createBonusFood(); } // Create new food. createFood(); } // Check has snake touched the bonus food? if (isBonusFoodAvailable && pointOfBonusFood.x <= newHeadLocX && pointOfBonusFood.y <= newHeadLocY && (pointOfBonusFood.x + SNAKE_BODY_PART_SQURE) >= newHeadLocX && (pointOfBonusFood.y + SNAKE_BODY_PART_SQURE) >= newHeadLocY) { board.remove(bonusfood); score += 100; scoreViewer.setText("Score ==>" + score); isBonusFoodAvailable = false;
- 55. void processNextStep() { boolean isBorderTouched = false; // Generate new location of snake head. int newHeadLocX = (int) snakeBodyPart[0].getLocation().getX() + directionX; int newHeadLocY = (int) snakeBodyPart[0].getLocation().getY() + directionY; // Most last part of the snake is food. int foodLocX = (int) snakeBodyPart[totalBodyPart - 1].getLocation().getX(); int foodLocY = (int) snakeBodyPart[totalBodyPart - 1].getLocation().getY(); // Check does snake cross the border of the board? if (newHeadLocX >= BOARD_WIDTH - SNAKE_BODY_PART_SQURE) { newHeadLocX = 0; isBorderTouched = true; } else if (newHeadLocX <= 0) { newHeadLocX = BOARD_WIDTH - SNAKE_BODY_PART_SQURE; isBorderTouched = true; } else if (newHeadLocY >= BOARD_HEIGHT - SNAKE_BODY_PART_SQURE) { newHeadLocY = 0; isBorderTouched = true; } else if (newHeadLocY <= 0) { newHeadLocY = BOARD_HEIGHT - SNAKE_BODY_PART_SQURE; isBorderTouched = true; } // Check has snake touched the food? if (newHeadLocX == foodLocX && newHeadLocY == foodLocY) { // Set score. score += 5; scoreViewer.setText("Score==>" + score); // Check bonus food should be given or not? if (score % 50 == 0 && !isBonusFoodAvailable) { createBonusFood(); } // Create new food. createFood(); } // Check has snake touched the bonus food? if (isBonusFoodAvailable && pointOfBonusFood.x <= newHeadLocX && pointOfBonusFood.y <= newHeadLocY && (pointOfBonusFood.x + SNAKE_BODY_PART_SQURE) >= newHeadLocX && (pointOfBonusFood.y + SNAKE_BODY_PART_SQURE) >= newHeadLocY) { board.remove(bonusfood); score += 100; scoreViewer.setText("Score ==>" + score); isBonusFoodAvailable = false; Monitoring code Monitoring code Monitoring code
- 56. Aspect Oriented Programming code weaving
- 57. void processNextStep() { boolean isBorderTouched = false; // Generate new location of snake head. int newHeadLocX = (int) snakeBodyPart[0].getLocation().getX() + directionX; int newHeadLocY = (int) snakeBodyPart[0].getLocation().getY() + directionY; // Most last part of the snake is food. int foodLocX = (int) snakeBodyPart[totalBodyPart - 1].getLocation().getX(); int foodLocY = (int) snakeBodyPart[totalBodyPart - 1].getLocation().getY(); // Check does snake cross the border of the board? if (newHeadLocX >= BOARD_WIDTH - SNAKE_BODY_PART_SQURE) { newHeadLocX = 0; isBorderTouched = true; } else if (newHeadLocX <= 0) { newHeadLocX = BOARD_WIDTH - SNAKE_BODY_PART_SQURE; isBorderTouched = true; } else if (newHeadLocY >= BOARD_HEIGHT - SNAKE_BODY_PART_SQURE) { newHeadLocY = 0; isBorderTouched = true; } else if (newHeadLocY <= 0) { newHeadLocY = BOARD_HEIGHT - SNAKE_BODY_PART_SQURE; isBorderTouched = true; } // Check has snake touched the food? if (newHeadLocX == foodLocX && newHeadLocY == foodLocY) { // Set score. score += 5; scoreViewer.setText("Score==>" + score); // Check bonus food should be given or not? if (score % 50 == 0 && !isBonusFoodAvailable) { createBonusFood(); } // Create new food. createFood(); } // Check has snake touched the bonus food? if (isBonusFoodAvailable && pointOfBonusFood.x <= newHeadLocX && pointOfBonusFood.y <= newHeadLocY && (pointOfBonusFood.x + SNAKE_BODY_PART_SQURE) >= newHeadLocX && (pointOfBonusFood.y + SNAKE_BODY_PART_SQURE) >= newHeadLocY) { board.remove(bonusfood); score += 100; scoreViewer.setText("Score ==>" + score); isBonusFoodAvailable = false; Monitoring code Monitoring code Monitoring code
- 58. void processNextStep() { boolean isBorderTouched = false; // Generate new location of snake head. int newHeadLocX = (int) snakeBodyPart[0].getLocation().getX() + directionX; int newHeadLocY = (int) snakeBodyPart[0].getLocation().getY() + directionY; // Most last part of the snake is food. int foodLocX = (int) snakeBodyPart[totalBodyPart - 1].getLocation().getX(); int foodLocY = (int) snakeBodyPart[totalBodyPart - 1].getLocation().getY(); Monitoring code // Check does snake cross the border of the board? if (newHeadLocX >= BOARD_WIDTH - SNAKE_BODY_PART_SQURE) { newHeadLocX = 0; isBorderTouched = true; } else if (newHeadLocX <= 0) { newHeadLocX = BOARD_WIDTH - SNAKE_BODY_PART_SQURE; isBorderTouched = true; } else if (newHeadLocY >= BOARD_HEIGHT - SNAKE_BODY_PART_SQURE) { newHeadLocY = 0; isBorderTouched = true; } else if (newHeadLocY <= 0) { newHeadLocY = BOARD_HEIGHT - SNAKE_BODY_PART_SQURE; isBorderTouched = true; } Monitoring code // Check has snake touched the food? if (newHeadLocX == foodLocX && newHeadLocY == foodLocY) { // Set score. score += 5; scoreViewer.setText("Score==>" + score); // Check bonus food should be given or not? if (score % 50 == 0 && !isBonusFoodAvailable) { createBonusFood(); } // Create new food. createFood(); } Monitoring code // Check has snake touched the bonus food? if (isBonusFoodAvailable && pointOfBonusFood.x <= newHeadLocX &&
- 59. client Code Client engine Service messages Monitors inside the code Passive monitoring Service Engine Service Code
- 60. client Code Client engine Service messages Monitors inside the engine Passive monitoring Service Engine Service Code
- 63. client Code Client engine Service messages Monitors inside the engine Passive monitoring Service Engine Service Code
- 64. client Code Client engine Service messages Monitors the message Passive monitoring Service Engine Service Code
- 65. client Code Client engine Service messages ENTERPRISE SERVICE BUS Passive monitoring Service Engine Service Code
- 66. client Code Service Engine Client engine ENTERPRISE SERVICE BUS Passive monitoring Service Code
- 67. This is what we do
- 68. SALMon
- 70. passive monitoring + online testing SALMon’s Features
- 71. Extensible with new metrics SALMon’s Features
- 72. Extensible with new types of services SALMon’s Features
- 73. Several mechanisms to retrieve the QoS SALMon’s Features
- 76. To conclude...
- 77. 1 Activities in the service lifecycle: - Service selection - Service level agreement - Service adaptation 2 Monitoring - Online testing - Passive monitoring 3 SALMon