DT_Spark 发表于 2016-3-13 23:52:56

Spark入门篇第2课:Scala面向对象彻底精通



Scala面向对象彻底精通
杭州-Frank



Scala中的类、object实战详解
Scala是纯面向对象语言。谈面向对象,一定要谈类,类把数据和代码封装起来。


跟Java一样,Scala也是用关键字class来定义类。示例如下:

scala> class HiScala{
   | private var name = "Spark"
   | def sayName(){println(name)}
   | def getName = name
   | }
defined class HiScala

以上代码,定义了一个名称为HiScala的类,默认情况下是public级别,所以public关键字可以不写。

[*]定义了一个属性name,为可变变量,访问级别为private,在类的外面不能被访问!
[*]定义一个函数:sayName
[*]定义一个函数:getName

在Scala中,变量与类中的方法是同等级的,可以直接相互赋值。


创建类实例

scala> val scal = new HiScala
scal: HiScala = HiScala@1c655221
//此时,scal就是HiScala类的一个实例。但是,在Scala中我们一边不会用new来创建类的实例,而是用apply工厂方法模式来创建。

//调用scal的sayName方法,用于打印出name成员的值。
scala> scal.sayName()
Spark

//由于sayName没有传参数,所以可以把括号去掉,这样更简洁。
scala> scal.sayName
Spark

//调用getName方法,访问name成员的值
scala> scal.getName
res2: String = Spark
//此时确实返回了name的值。

//该示例中name是私有的,所以不能直接访问scal实例的name,如下访问就出错了。
scala> scal.name
<console>:10: error: variable name in class HiScala cannot be accessed in HiScala
            scal.name
                   ^
get与set
Scala的get和set跟Java的get和set有很大的差异。
在Scala中,如果给变量前定义了private,那么Scala解释器会给这个变量自动生成private的get和set方 法;
如果变量前没有定义了private,那么解释器会给这个变量自动生成public的get和set方法,这样就可以直接访问该类的实例对象的成员变量,实际访问的是它的set和get方法。

//我们重新改造上面的类,把属性name前面的private访问级别去掉。
scala> class HiScala{
   |      var name = "Spark"   //去掉了private关键字
   |      def sayName(){println(name)}
   |      def getName = name
   |      }
defined class HiScala

scala> val scal = new HiScala
scal: HiScala = HiScala@1e6d1014

//访问name属性, 值为Spark
scala> scal.name
res4: String = Spark
//此时虽然是访问属性name,但其实不是直接访问var指定的变量name,而是Scala解释器自动给name生成public级别的get和set方法。

//修改name属性
scala> scal.name="Scala"
scal.name: String = Scala

//再次访问name属性, 值已经变为Scala
scala> scal.name
res5: String = Scala


自定义的get和set
scala> class Person {
   |   private var myName = "Flink"
   |   def name = this.myName      //自定义get方法
   |   def name_=(newName : String){//自定义set方法,注意下划线和等号之间没有空格!
   |         myName = newName
   |         println("Hi " + myName)      
   |   }
   | }
defined class Person

// luck为Person 类的实例
scala> val luck = new Person
luck: Person = Person@6a5fc7f7

//通过自定义的get方法,访问到了myName属性
scala> luck.name
res0: String = Flink

//调用自定义的set方法,修改了myName属性
scala> luck.name = "Spark"
Hi Spark
luck.name: String = Spark

//再次访问myName属性,发现属性值已经变成Spark
scala> luck.name
res2: String = Spark

//修改上面的示例,仅仅暴露属性的get方法,没有为其复写set方法。但是提供一个名为update的方法用来修改该属性的值。
scala> class Person {
   |   private var myName = "Flink"
   |   def name = this.myName//get方法
   |   def update(newName : String){
   |         myName = newName
   |         println("Hi " + myName)      
   |    }
   | }
defined class Person

// luck为Person 类的实例
scala>   val luck = new Person
luck: Person = Person@7c469c48

//通过自定义的get方法,访问myName属性值,初始值为Flink
scala> luck.name
res4: String = Flink

//想直接通过set方法来修改myName,会提示出错,因为没有复写set方法。
scala> luck.name="Hadoop"
<console>:9: error: value name_= is not a member of Person
       luck.name="Hadoop"
            ^

//通过额外提供的update方法来修改属性
scala> luck.update("Hadoop")
Hi Hadoop

//再次查看myName属性值,发现已经变成了Hadoop
scala> luck.name
res6: String = Hadoop


private
private至关重要的,在Spark源码中随处可见。
代表属性或方法为对象私有!在类私有的基础上更强一层的控制。

//定义一个类:Person
scala> class Person {
   |   private var myName = "Flink"
   |   def name = this.myName
   |   def update(newName : String){
   |         myName = newName
   |         println("Hi " + myName)      
   |   }
   |   def talk(p:Person) = {
   |         println("hello:"+p.name)
   |   }
   | }
defined class Person

//定义 p1为Person对象
scala> val p1=new Person
p1: Person = Person@14555e0a
//定义 p2为Person对象
scala> val p2=new Person
p2: Person = Person@1b2abca6

//把p1的myName 属性值改为p1
scala> p1.update("p1")
Hi p1

//把p2的myName 属性值改为p2
scala> p2.update("p2")
Hi p2

//查看p1的myName 属性值,此时已经改为p1
scala> p1.name
res14: String = p1

//查看p2的myName 属性值,此时已经改为p2
scala> p2.name
res15: String = p2

//调用p1的talk方法,传入p2对象,打印出p2的myName 属性值
scala> p1.talk(p2)
hello:p2


//我们修改一下代码,看看下面代码:
scala> class Person {
   |   private var name = "Flink"
   |   def update(newName : String){
   |         name = newName
   |         println("Hi " + name)      
   |   }
   |   def talk(p:Person) = {
   |         println("hello:"+p.name)
   |   }
   | }
<console>:15: error: value name is not a member of Person
               println("hello:"+p.name)
                                  ^
//此时,在定义类时就报错!因为talk方法中p参数是Person类的对象,而name属性被限制为private,所以只能在Person类内部使用,Person类的对象无权使用。也就是说在Person类中,update方法中可以使用name,但是talk方法访问对象p的name是不允许的!

// private改成private之后,下面的写法就能正常定义,代码如下:
scala> class Person {
   |   private var name = "Flink"
   |   def update(newName : String){
   |         name = newName
   |         println("Hi " + name)      
   |   }
   |   def talk(p:Person) = {
   |         println("hello:"+p.name)
   |   }
   | }
defined class Person
scala>



DT_Spark 发表于 2016-3-14 00:26:03

构造器的重载
scala> class Person {
   |   private var name = "Flink"
   |   private var age = 10
   |   def update(newName : String){
   |         name = newName
   |         println("Hi " + name)      
   |   }
   |
   |         
   |   //重载的构造器,首先调用默认的构造器
   |   def this(name:String){
   |       this()
   |       this.name=name
   |   }
   |   
   |   //重载的构造器,调用上面已经存在的构造器
   |   def this(name:String, age:Int){
   |       this(name)
   |       this.age=age
   |   }
   | }
defined class Person

在Spark源码中,构造器重载非常常见,SparkContext类重写了有很多构造器,在创建SparkContext实例对象时,传递不同的参数来调用相应的构造器。与类名放在一起的构造器为默认构造器。默认构造器可以带参数也可以不带参数。初始化类成员的工作,都放在默认构造器中完成。在SparkContext类中,creationSite、allowMultipleContexts等变量,就是在SparkContext类的默认构造器中完成。


object

定义一个类同名的object对象,里面存放静态的成员或者方法,把该object对象称之为该类的伴生对象。
在SparkContext.scala中,SparkContext object为SparkContext类的伴生对象,里面存放一系列静态的成员和静态的方法。而且,当我们第一次调用SparkContext时,SparkContext伴生对象会被执行一次,仅此一次。


下面是一个示例:
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(图1)
上图1中object Person是class Person的伴生对象,class Person称之为object Person的伴生类。伴生对象适合在里面定义一些工具方法,以及存放一些全局唯一的常量,节省空间。

//第一次调用:Person伴生对象的getSalary方法
//此时,我们发现:Person伴生对象被初始化,打印出字符串Scala。
scala> Person.getSalary
Scala
res34: Double = 0.0

//第二次调用:Person伴生对象的getSalary方法
//此时,我们发现:Person伴生对象不再需要初始化,没有打印出字符串Scala。
scala> Person.getSalary
res35: Double = 0.0
以上示例中确实验证了:伴生对象会被执行一次,仅此一次。

Scala中,我们在定义类的对象时, 一般都不会用new类名,再传入参数的方式来定义。而是直接用类名,或者类名加参数的方式。例如,我们重温下面的示例:
我们构造一个数组,其实是调用Array的伴生对象object Array的apply方法。
scala> val array=Array(1,2,3)
array: Array = Array(1, 2, 3)

scala> val array=Array.apply(1,2,3)
array: Array = Array(1, 2, 3)
以上两种定义数组的方式效果是一样的。apply方法就是当前类的伴生对象的工厂方法。延伸一下,Java水平比较高才编程人员,在构造Java对象时,一般来说不会直接new一个类,而是通过工厂方法模式来创建。而Scala语言中,天生就支持这次模式,所以在具体类对象构造时,一般都是在伴生类的伴生对象的apply方法中去实现!这样可以控制对象的生成。
            Scala中的抽象类、接口实战详解
abstract
抽象类使用abstract关键字,以Spark源码RDD类为示例:
abstract class RDD(@transition private var _sc: SparkContext,@transition private var deps: Seq],) extends Serializable with Logging {...
子类去继承抽象类,跟Java一样,也是使用extends关键字。如JdbcRDD就继承了RDD抽象类,如下:
class JdbcRDD(
    sc: SparkContext,
    getConnection: () => Connection,
    sql: String,
    lowerBound: Long,
    upperBound: Long,
    numPartitions: Int,
    mapRow: (ResultSet) => T = JdbcRDD.resultSetToObjectArray _)
extends RDD(sc, Nil) with Logging {
那么JdbcRDD就可以使用父类RDD所有它可以使用的属性和方法。
当然,子类也可以覆盖父类的属性和方法。注意,这里面有个前提,父类的属性和方法没有加final。

一个抽象类,那么里面肯定是定义了某个方法,但是没有又实现体,只有方法的说明。比如:def compute(split: Partition, context: TaskContext): Iterator
上面RDD抽象类的代码块中,compute就是RDD抽象类的一个方法,只有说明,没有实现体。

override
在上面JdbcRDD子类中,因为JdbcRDD继承了RDD抽象类,那么在JdbcRDD中一定要复写compute方法。
使用override关键字表示复写父类的该方法。除了覆盖父类的方法,也可以使用override来覆盖父类的val属性。父类在定义属性时没有给具体的值,就是抽象属性,在子类中,子类必须覆盖该属性。

trait
相当于Java的接口。在trait定义的类中可以定义抽象方法,但是又没有具体的实现。子类可以使用extends关键字来继承该父类。

以Spark源码中的RDD类为示例,RDD继承了Serializable和Logging两个父类。一个子类如果继承多个父类,那么继承的第一个父类前使用extends关键字,后面的父类使用with关键字。RDD继承的这两个父类,在定义时都使用trait关键字来定义。Scala语法中,不允许一个子类同时继承多个抽象父类,但是允许同时继承多个trait父类。
abstract class RDD(
    @transient private var _sc: SparkContext,
    @transient private var deps: Seq]
) extends Serializable with Logging {

下面是Serializable类的部分源码:trait Serializable extends Any with java.io.Serializable

trait的用途,更多的是作为工具方法的容器。我们把通用的功能,放在trait中。一个子类,如果需要把很多通用的功能都混进来,那么就需要继承多个trait父类,继承的第一个父类使用extends,后面的父类使用with。Spark源码Master类就是一个示例,继承了多个父类。

小姜 发表于 2016-10-10 10:33:36

感谢楼主分享
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