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InterConnect2017
6190: Server-Side Swift: An Introduction for Java EE Developers
Chris BaileySTSM, Technical Architect Java, Node.js and Swift at IBM
Stephan Knitelius, Senior ConsultantFaktor Zhen AG
Swift ProgrammingSafe | Expressive | Fast
Hello World
Swift: Hello World
print("Hello, world!")
Swift: Hello World
print("Hello, world!")
> swift main.swift
Swift: Hello World
print("Hello, world!")
> swift main.swift > main
Swift: Hello World
print("Hello, world!")
> swift main.swift > main "Hello, world!"
Swift: Hello World
let event = ”InterConnect"
print("Hello, \(event)”)
Swift: Hello World
let event = ”InterConnect"
print("Hello, \(event)”)
> swift main.swift
Swift: Hello World
let event = ”InterConnect"
print("Hello, \(event)”)
> swift main.swift > main "Hello, InterConnect"
Swift: Hello World
let event = "InterConnect" event = "Somewhere else" print("Hello, \(event)”)
Swift: Hello World
let event = "InterConnect" event = "Somewhere else" print("Hello, \(event)”)
> swift main.swift
Swift: Hello World
let event = "InterConnect" event = "Somewhere else" print("Hello, \(event)”)
> swift main.swift error: cannot assign to value: 'event' is a 'let' constant
Swift: Hello World
let event = "InterConnect" event = "Somewhere else" print("Hello, \(event)”)
Swift: Hello World
let event = "InterConnect" event = "Somewhere else" print("Hello, \(event)”)
Swift: Hello World
var event = "InterConnect" event = "Somewhere else" print("Hello, \(event)”)
Swift: Hello World
var event = "InterConnect" event = "Somewhere else" print("Hello, \(event)”)
> swift main.swift
Swift: Hello World
var event = "InterConnect" event = "Somewhere else" print("Hello, \(event)”)
> swift main.swift > main "Hello, Somewhere else"
Swift: Hello World
Functions
func addInts(a: Int, b: Int) -> Int { return a + b }
Swift: Functions
func addInts(a: Int, b: Int) -> Int { return a + b }
addInts(a: 1, b: 3)
Swift: Functions
func addInts(_ a: Int, _ b: Int) -> Int { return a + b }
Swift: Functions
func addInts(_ a: Int, _ b: Int) -> Int { return a + b }
addInts(1, 3)
Swift: Functions
func move(from start: Point, to end: Point) -> Bool { /* code */ }
Swift: Functions
func move(from start: Point, to end: Point) -> Bool { /* code */ }
move(from: a, to: b)
Swift: Functions
func minAndMax(numbers: Int...) -> (min: Int, max: Int) {
}
Swift: Functions and Tuples
func minAndMax(numbers: Int...) -> (min: Int, max: Int) { var min = numbers[0] var max = numbers[0] for number in numbers { if number > max { max = number } else if number < min { min = number } } return (min, max) }
Swift: Functions and Tuples
func minAndMax(numbers: Int...) -> (min: Int, max: Int) { var min = numbers[0] var max = numbers[0] for number in numbers { if number > max { max = number } else if number < min { min = number } } return (min, max) }
let result = minAndMax(1, 2, 3, 4, 5)
Swift: Functions: Varargs and Tuples
func minAndMax(numbers: Int...) -> (min: Int, max: Int) { var min = numbers[0] var max = numbers[0] for number in numbers { if number > max { max = number } else if number < min { min = number } } return (min, max) }
let result = minAndMax(1, 2, 3, 4, 5) print(result.min) print(result.max)
Swift: Functions: Varargs and Tuples
Control Flow
let expenseCosts = [34.4, 30.99, 250.0]
var sum: Double = 0
for expense in expenseCosts { sum += expense }
print("total cost is \(sum)")
Swift: Loops and Iterators
let flavour = "Vanilla"
switch flavour { case "Chocolate": print("Quite nice") case "Strawberry", "Rum'n'raisin": print("Very nice") case let str where str.hasPrefix("Mint"): print("UGH!!!, I hate \(str)") default: print("No opinion about this") }
Swift: Switch Statements
let flavour = "Vanilla"
switch flavour { case "Chocolate": print("Quite nice") case "Strawberry", "Rum'n'raisin": print("Very nice") case let str where str.hasPrefix("Mint"): print("UGH!!!, I hate \(str)") default: print("No opinion about this") }
> swiftc main.swift > main
Swift: Switch Statements
let flavour = "Vanilla"
switch flavour { case "Chocolate": print("Quite nice") case "Strawberry", "Rum'n'raisin": print("Very nice") case let str where str.hasPrefix("Mint"): print("UGH!!!, I hate \(str)") default: print("No opinion about this") }
> swiftc main.swift > main "No opinion about this"
Swift: Switch Statements
let flavour = "Mint Chocolate"
switch flavour { case "Chocolate": print("Quite nice") case "Strawberry", "Rum'n'raisin": print("Very nice") case let str where str.hasPrefix("Mint"): print("UGH!!!, I hate \(str)") default: print("No opinion about this") }
Swift: Switch Statements
let flavour = "Mint Chocolate"
switch flavour { case "Chocolate": print("Quite nice") case "Strawberry", "Rum'n'raisin": print("Very nice") case let str where str.hasPrefix("Mint"): print("UGH!!!, I hate \(str)") default: print("No opinion about this") }
> swiftc main.swift > main
Swift: Switch Statements
let flavour = "Mint Chocolate"
switch flavour { case "Chocolate": print("Quite nice") case "Strawberry", "Rum'n'raisin": print("Very nice") case let str where str.hasPrefix("Mint"): print("UGH!!!, I hate \(str)") default: print("No opinion about this") }
> swiftc main.swift > main "UGH!!!, I hate Mint Chocolate"
Swift: Switch Statements
let numbers = [1, 2, 3]
numbers.map({ (number: Int) -> Int in return number * 5 }) // [5, 10, 15]
numbers.map({ number in number * 5 })
numbers.map { $0 * 5 }
Swift: Closures
Data Types
class Square {
var area: Double = 0
init(sideLength: Double) { self.sideLength = sideLength } var sideLength: Double { get { return sqrt(area) } set { area = newValue * newValue } } }
Swift: Classes
struct Point { var x: Int var y: Int func description() -> String { return "x=\(x), y=\(y)" } }
var coord = Point(x: 2, y: 4)
var newCoord = coord coord.x = 4
print(coord.description()) // x=4, y=4 print(newCoord.description()) // x=2, y=4
Swift: Structs
enum ApprovalStatus { case PendingOn(String) case Denied case Approved(String) }
var status = ApprovalStatus.PendingOn("Joe Bloggs")
status = .Approved("13213-4341321-2")
switch status { case .PendingOn(let approver): print("Request pending on approval from \(approver)") case .Denied: print("Request DENIED") case .Approved(let code): print("Request approved - auth code \(code)") }
Swift: Enums
Concurrency
aqueue-FIFOputtaskintoqueuetoexecute
dequeuedtasksarebeingexecuted
inwai8ngSerial or Concurrent FIFO Queue
Waiting TasksTasks AddedTo Queue
Tasks RemovedFor Execution
aqueue-FIFOputtaskintoqueuetoexecute
dequeuedtasksarebeingexecuted
inwai8ngSerial or Concurrent FIFO Queue
Waiting TasksTasks AddedTo Queue
Tasks RemovedFor Execution
import Dispatch
let serialQueue = DispatchQueue(label: "serial queue")
aqueue-FIFOputtaskintoqueuetoexecute
dequeuedtasksarebeingexecuted
inwai8ngSerial or Concurrent FIFO Queue
Waiting TasksTasks AddedTo Queue
Tasks RemovedFor Execution
import Dispatch
let serialQueue = DispatchQueue(label: "serial queue")
serialQueue.async { print("run on serial queue") } serialQueue.asyncAfter(deadline: .now() + DispatchTimeInterval.seconds(1)) { print("run on serial queue") }
aqueue-FIFOputtaskintoqueuetoexecute
dequeuedtasksarebeingexecuted
inwai8ngSerial or Concurrent FIFO Queue
Waiting TasksTasks AddedTo Queue
Tasks RemovedFor Execution
import Dispatch
let concurrentQueue = DispatchQueue(label: "concurrent queue", attributes: .concurrent)
concurrentQueue.async { print("run on concurrent queue") }
aqueue-FIFOputtaskintoqueuetoexecute
dequeuedtasksarebeingexecuted
inwai8ngSerial or Concurrent FIFO Queue
Waiting TasksTasks AddedTo Queue
Tasks RemovedFor Execution
import Dispatch
let queue = DispatchQueue(label: "group queue", attributes: .concurrent) let group = DispatchGroup()
aqueue-FIFOputtaskintoqueuetoexecute
dequeuedtasksarebeingexecuted
inwai8ngSerial or Concurrent FIFO Queue
Waiting TasksTasks AddedTo Queue
Tasks RemovedFor Execution
import Dispatch
let queue = DispatchQueue(label: "group queue", attributes: .concurrent) let group = DispatchGroup()
queue.async(group: group) { print("work 1") }
queue.async(group: group) { print("work 2") }
aqueue-FIFOputtaskintoqueuetoexecute
dequeuedtasksarebeingexecuted
inwai8ngSerial or Concurrent FIFO Queue
Waiting TasksTasks AddedTo Queue
Tasks RemovedFor Execution
import Dispatch
let queue = DispatchQueue(label: "group queue", attributes: .concurrent) let group = DispatchGroup()
queue.async(group: group) { print("work 1") }
queue.async(group: group) { print("work 2") }
group.notify(queue: queue) { print("all work completed") }
Swift ProgrammingSafe | Expressive | Fast
Swift ProgrammingSafe | Expressive | Fast
Swift @ IBM
public class Test { private static void length (String string){ System.out.println(string.length()); } public static void main(String[] args){ String string = null; length(string); } }
SwiftJava
Swift @ IBM
func length(of string: String) -> Void { print(string.characters.count) }
var str: String? = nil
length(of: str)
public class Test { private static void length (String string){ System.out.println(string.length()); } public static void main(String[] args){ String string = null; length(string); } }
SwiftJava
Swift @ IBM
func length(of string: String) -> Void { print(string.characters.count) }
var str: String? = nil
length(of: str)
> swiftc main.swift
public class Test { private static void length (String string){ System.out.println(string.length()); } public static void main(String[] args){ String string = null; length(string); } }
> javac Test.java
SwiftJava
Swift @ IBM
func length(of string: String) -> Void { print(string.characters.count) }
var str: String? = nil
length(of: str)
> swiftc main.swift
public class Test { private static void length (String string){ System.out.println(string.length()); } public static void main(String[] args){ String string = null; length(string); } }
> javac Test.java >
SwiftJava
Swift @ IBM
func length(of string: String) -> Void { print(string.characters.count) }
var str: String? = nil
length(of: str)
> swiftc main.swift > Error line 7: Value of optional type ‘String?’ not unwrapped; > did you mean to use ‘!’ or ‘?’?
public class Test { private static void length (String string){ System.out.println(string.length()); } public static void main(String[] args){ String string = null; length(string); } }
> javac Test.java >
SwiftJava
Swift @ IBM
func length(of string: String) -> Void { print(string.characters.count) }
var str: String? = nil
length(of: str)
> swiftc main.swift > Error line 7: Value of optional type ‘String?’ not unwrapped; > did you mean to use ‘!’ or ‘?’?
public class Test { private static void length (String string){ System.out.println(string.length()); } public static void main(String[] args){ String string = null; length(string); } }
> javac Test.java > java Test
SwiftJava
Swift @ IBM
func length(of string: String) -> Void { print(string.characters.count) }
var str: String? = nil
length(of: str)
> swiftc main.swift > Error line 7: Value of optional type ‘String?’ not unwrapped; > did you mean to use ‘!’ or ‘?’?
public class Test { private static void length (String string){ System.out.println(string.length()); } public static void main(String[] args){ String string = null; length(string); } }
> javac Test.java > java Test Exception in thread "main" java.lang.NullPointerException at Test.length(Test.java:5) at Test.main(Test.java:11)
SwiftJava
var optionalString: String? = nil
var string: String = optionalString
Swift: Structs
var optionalString: String? = nil
var string: String = optionalString
> swiftc main.swift
Swift: Structs
var optionalString: String? = nil
var string: String = optionalString
> swiftc main.swift error: value of optional type 'String?' not unwrapped; did you mean to use '!' or ‘?'? var string: String = optionalString ^
Swift: Structs
var optionalString: String? = nil
var string: String = optionalString!
Swift: Structs
var optionalString: String? = nil
var string: String = optionalString!
> swiftc main.swift
Swift: Structs
var optionalString: String? = nil
var string: String = optionalString!
> swiftc main.swift > main
Swift: Structs
var optionalString: String? = nil
var string: String = optionalString!
> swiftc main.swift > main fatal error: unexpectedly found nil while unwrapping an Optional value
Swift: Structs
var optionalString: String? = nil
guard var string: String = optionalString else { print(‘Error! Null string found’) }
Swift: Structs
var optionalString: String? = nil
guard var string: String = optionalString else { print(‘Error! Null string found’) }
> swiftc main.swift
Swift: Structs
var optionalString: String? = nil
guard var string: String = optionalString else { print(‘Error! Null string found’) }
> swiftc main.swift > main “Error! Null string found”
Swift: Structs
Swift ProgrammingSafe | Expressive | Fast
func move(from start: Point, to end: Point) -> Bool { /* code */ }
Swift: Functions
func move(from start: Point, to end: Point) -> Bool { /* code */ }
move(from: a, to: b)
Swift: Functions
Swift @ IBM
public class Test { private static void length (String string){ System.out.println(string.length()); } public static void main(String[] args){ String string = null; length(string); } }
SwiftJava
Swift @ IBM
public class Test { private static int length (String string){ return(string.length()); } public static void main(String[] args){ String string = null; length(string); } }
SwiftJava
Swift @ IBM
func length(of string: String) -> Int { return(string.characters.count) }
var str: String = ”MyString”
length(of: str)
public class Test { private static int length (String string){ return(string.length()); } public static void main(String[] args){ String string = null; length(string); } }
SwiftJava
Swift @ IBM
func length(of string: String) -> Int { return(string.characters.count) }
var str: String = ”MyString”
length(of: str)
> swiftc main.swift
public class Test { private static int length (String string){ return(string.length()); } public static void main(String[] args){ String string = null; length(string); } }
> javac Test.java
SwiftJava
Swift @ IBM
func length(of string: String) -> Int { return(string.characters.count) }
var str: String = ”MyString”
length(of: str)
> swiftc main.swift
public class Test { private static int length (String string){ return(string.length()); } public static void main(String[] args){ String string = null; length(string); } }
> javac Test.java >
SwiftJava
Swift @ IBM
func length(of string: String) -> Int { return(string.characters.count) }
var str: String = ”MyString”
length(of: str)
> swiftc main.swift > Warning: result of call to ‘length(of:)’ is unused
public class Test { private static int length (String string){ return(string.length()); } public static void main(String[] args){ String string = null; length(string); } }
> javac Test.java >
SwiftJava
Swift @ IBM
@discardableResult func length(of string: String) -> Int { return(string.characters.count) }
var str: String = ”MyString”
length(of: str)
> swiftc main.swift
public class Test { private static int length (String string){ return(string.length()); } public static void main(String[] args){ String string = null; length(string); } }
> javac Test.java >
SwiftJava
Swift @ IBM
@discardableResult func length(of string: String) -> Int { return(string.characters.count) }
var str: String = ”MyString”
length(of: str)
> swiftc main.swift >
public class Test { private static int length (String string){ return(string.length()); } public static void main(String[] args){ String string = null; length(string); } }
> javac Test.java >
SwiftJava
Swift ProgrammingSafe | Expressive | Fast
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http://benchmarksgame.alioth.debian.org/u64q/performance.php?test=spectralnorm
Typed vs Untyped Performance
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http://benchmarksgame.alioth.debian.org/u64q/performance.php?test=spectralnorm
Typed vs Untyped Performance
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4 4.3
0
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http://benchmarksgame.alioth.debian.org/u64q/performance.php?test=spectralnorm
Typed vs Untyped Performance
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15.8
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http://benchmarksgame.alioth.debian.org/u64q/performance.php?test=spectralnorm
Typed vs Untyped Performance
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+
Kitura + LibertyDemo
https://github.com/sknitelius/RacketenMessages-Swift https://github.com/sknitelius/RacketenMessages-Java
JSON Parsing
Persistence
94 1/17/17
GATEWAY
PUBLIC NETWORK CLOUD NETWORK
Client Devices Hosted Services
ROUTING PROXY
Micro-ServicesBackend For Frontend(BFF)
Questions?
Bluemix Mobile & Omni-Channel!BMO-6321: Patterns in Omni-Channel Cloud Application Development
Containers & Microservices!BMC-2173: Introduction to Docker Containers and Microservices
Visit the DevZone in the Concourse for open Hello World labs and Ask Me Anything booths!
Wednesday, 11:15 AM - 12:00 PM | South Pacific C | Session ID: 6321A
Tuesday, 4:45 PM - 5:30 PM | South Pacific A | Session ID: 2173A
Tuesday, 11:00 AM - 12:45 PM | DevZone Ask Me Anything # 2 | Session ID: 7087AAsk Me Anything: Bluemix Cloud-Native Development
Ask Me Anything: Server-Side Swift DevelopmentWednesday, 2:30 PM - 5:00 PM | DevZone Ask Me Anything # 6 | Session ID: 7088A
Node.js & LoopBackBAP-1117: Introduction to LoopBackNode.js Framework
Liberty & MicroservicesBAP - 5081: Microservices with IBM WebSphere Liberty:What, Why and When?
Wednesday, 11:15 AM - 12:00 PM | Islander F | Session ID: 1117A
Tuesday, 7:00 PM - 7:20 PM | Engagement Theater Booth #319 | Session ID: 5081A
1/17/17
Please noteIBM’s statements regarding its plans, directions, and intent are subject to change or withdrawal without notice at IBM’s sole discretion.
Information regarding potential future products is intended to outline our general product direction and it should not be relied on in making a purchasing decision.
The information mentioned regarding potential future products is not a commitment, promise, or legal obligation to deliver any material, code or functionality. Information about potential future products may not be incorporated into any contract.
The development, release, and timing of any future features or functionality described for our products remains at our sole discretion.
Performance is based on measurements and projections using standard IBM benchmarks in a controlled environment. The actual throughput or performance that any user will experience will vary depending upon many factors, including considerations such as the amount of multiprogramming inthe user’s job stream, the I/O configuration, the storage configuration, and the workload processed. Therefore, no assurance can be given that an individual user will achieve results similar to those stated here.
1/17/17
Notices and disclaimersCopyright © 2017 by International Business Machines Corporation (IBM). No part of this document may be reproduced or transmitted in any form without written permission from IBM.
U.S. Government Users Restricted Rights — use, duplication or disclosure restricted by GSA ADP Schedule Contract with IBM.
Information in these presentations (including information relating to products that have not yet been announced by IBM) has been reviewed for accuracy as of the date of initial publication and could include unintentional technical or typographical errors. IBM shall have no responsibility to update this information. This document is distributed “as is” without any warranty, either express or implied. In no event shall IBM be liable for any damage arising from the use of this information, including but not limited to, loss of data, business interruption, loss of profit or loss of opportunity. IBM products and services are warranted according to the terms and conditions of the agreements under which they are provided.
IBM products are manufactured from new parts or new and used parts. In some cases, a product may not be new and may have been previously installed. Regardless, our warranty terms apply.”
Any statements regarding IBM's future direction, intent or product plans are subject to change or withdrawal without notice.
Performance data contained herein was generally obtained in a controlled, isolated environments. Customer examples are presented as illustrations of how those customers have used IBM products and the results they may have achieved. Actual performance, cost, savings or other results in other operating environments may vary.
References in this document to IBM products, programs, or services does not imply that IBM intends to make such products, programs or services available in all countries in which IBM operates or does business.
Workshops, sessions and associated materials may have been prepared by independent session speakers, and do not necessarily reflect the views of IBM. All materials and discussions are provided for informational purposes only, and are neither intended to, nor shall constitute legal or other guidance or advice to any individual participant or their specific situation.
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1/17/17
Notices and disclaimers continuedInformation concerning non-IBM products was obtained from the suppliers of those products, their published announcements or other publicly available sources. IBM has not tested those products in connection with this publication and cannot confirm the accuracy of performance, compatibility or any other claims related to non-IBM products. Questions on the capabilities of non-IBM products should be addressed to the suppliers of those products. IBM does not warrant the quality of any third-party products, or the ability of any such third-party products to interoperate with IBM’s products. IBM expressly disclaims all warranties, expressed or implied, including but not limited to, the implied warranties of merchantability and fitness for a particular, purpose.
The provision of the information contained herein is not intended to, and does not, grant any right or license under any IBM patents, copyrights, trademarks or other intellectual property right.
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InterConnect2017
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