This is a high level presentation of the LinkedIn mobile search page.

1. LinkedIn Mobile Search
iPhone Architecture
Dennis Byrne

2. Agenda
● Model View Controller Pattern
● Retrieval
o Core Data
o Typeahead
o Federated Search
● Cell construction & the Builder pattern
● Metrics
● Full Screen Scrolling
● Unit Testing

3. The Model - “if you can’t see it”
● Think nouns, not verbs
● LISearchV3Model.m
o SearchData.m
o NSArray
o NSDictionary
● Ridiculously Good Looking

4. The View - “if you can see it”
● LISearchV3ViewController.xib
● LISearchT1Cell.xib
● LISearchT1CellHigh.xib
● LISearchT1CellUltraHigh.xib
● LISearchT2Cell.xib
● LISearchT2CellHigh.xib
● LISearchV2FilterButton.xib

5. The Controller
● LISearchV3ViewController.m
● Think verbs, not nouns
● Delegate Pattern
● Event Listeners
● Glue code
● Logic

6. MVC … try to think of it as VCM
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TM

8. Agenda
● Model View Controller Pattern
● Retrieval
o Core Data
o Typeahead
o Federated Search
● Cell construction & the Builder pattern
● Metrics
● Full Screen Scrolling
● Unit Testing

9. Retrieval Data Sources
● Local Cache
o Core Data
o SQLite
● Typeahead
o phone-fe
o Typeahead Restli server
● Federated Search
o phone-fe
o Federated Search Restli server

10. Retrieval - Core Data

11. Retrieval - Remote Results
?
?

12. Retrieval - Threading Model
● Everything is on the main thread
● Except …
o Core Data retrieval
o Core Data callbacks
o HTTP requests

13. Retrieval
Controller
phone-fe

14. Agenda
● Model View Controller Pattern
● Retrieval
o Core Data
o Typeahead
o Federated Search
● Cell construction & the Builder pattern
● Metrics
● Full Screen Scrolling
● Unit Testing

15. Cell Construction - Builder Pattern
● LISearchV3UITableViewCellBuilder.m

16. Cell
Builder
Retrieval
Controller
phone-fe

17. Agenda
● Model View Controller Pattern
● Retrieval
o Core Data
o Typeahead
o Federated Search
● Cell construction & the Builder pattern
● Metrics
● Full Screen Scrolling
● Unit Testing

18. Metrics
● LISearchV3Metrics.m
● Page Views & Actions
● Performance
o First
o Second
o Third
o Platform
 iPhone
 android
 touch web

19. Cell
Builder
Metrics LPTimer
Retrieval
Controller
Perf
phone-fe

20. Agenda
● Model View Controller Pattern
● Retrieval
o Core Data
o Typeahead
o Federated Search
● Cell construction & the Builder pattern
● Metrics
● Full Screen Scrolling
● Unit Testing

21. Full Screen Scrolling

22. Cell
Builder
Full Screen
Scrolling
Metrics LPTimer
Retrieval
Controller
Perf
phone-fe

23. Agenda
● Model View Controller Pattern
● Retrieval
o Core Data
o Typeahead
o Federated Search
● Cell construction & the Builder pattern
● Metrics
● Full Screen Scrolling
● Unit Testing

24. Unit Testing
● SenTestCase
● LISearchV3JobScheduler
o LISearchV3ProductionJobScheduler.m
o LISearchV3TestJobScheduler.m
● OCMock

25. SenTest … similar to JUnit < 4.0
-(void)setUp {
}
-(void)testSomething {
STAssertEquals(YES, NO, @"msg here");
STAssertEqualsWithAccuracy(1.0, 1.2, 0.1, @””);
STFail(@”msg here”);
}

26. Dependency Injection
// similar to an interface in Java
@protocol LISearchV3JobScheduler <NSObject>
- (void)enqueueOnMainThread:(void(^)())block;
@end

27. OCMock
#import "OCMock.h"
id op = [OCMockObject mockForClass:[LINetworkOperation class]];
NSDictionary *tag = @{@”key”: @”value”};
[(LINetworkOperation *)[[op stub] andReturnValue:OCMOCK_VALUE(tag)] tag];

28. Cell
Builder
Full Screen
Scrolling
Metrics LPTimer
Retrieval
Controller
Perf
phone-fe
Job
Scheduler

29. The Napkin Test

30. Agenda
● Model View Controller Pattern
● Retrieval
o Core Data
o Typeahead
o Federated Search
● Cell construction & the Builder pattern
● Metrics
● Full Screen Scrolling
● Unit Testing