Mina源码阅读笔记（四）—Mina的连接IoConnector2

2022-05-01 16:10:53

接着Mina源码阅读笔记（四）—Mina的连接IoConnector1，，我们继续：

AbstractIoAcceptor:

001 package org.apache.mina.core.rewrite.service;
002  
003 import java.io.IOException;
004 import java.net.SocketAddress;
005 import java.util.ArrayList;
006 import java.util.Collections;
007 import java.util.HashSet;
008 import java.util.List;
009 import java.util.Set;
010 import java.util.concurrent.Executor;
011  
012 public abstract class AbstractIoAcceptor extends AbstractIoService implements
013         IoAcceptor
{
014  
015     private final List<SocketAddress>
defaultLocalAddresses = new ArrayList<SocketAddress>();
016  
017     private final List<SocketAddress>
unmodifiableDeffaultLocalAddresses = Collections
018             .unmodifiableList(defaultLocalAddresses);
019  
020     private final Set<SocketAddress>
boundAddresses = new HashSet<SocketAddress>();
021  
022     private boolean disconnectOnUnbind
= true;
023  
024     /**
这里不是很明白，为什么要用protected 而 不是private */
025     protected final Object
bindLock = new Object();
026  
027     /**
028      *
注意这个构造方法是一定要写的，否则编译不通过：抽象类继承时候，构造方法都要写,而且必须包含super
029      *
030      *
@param param
031      *           
sessionConfig
032      *
@param executor
033      */
034     protected AbstractIoAcceptor(Object
param, Executor executor) {
035         super(param,
executor);
036         defaultLocalAddresses.add(null);
037     }
038  
039     @Override
040     public SocketAddress
getLocalAddress() {
041  
042         Set<SocketAddress>
localAddresses = getLocalAddresses();
043         if (localAddresses.isEmpty())
{
044             return null;
045         }
046         return localAddresses.iterator().next();
047     }
048  
049     @Override
050     public final Set<SocketAddress>
getLocalAddresses() {
051         Set<SocketAddress>
localAddresses = new HashSet<SocketAddress>();
052         synchronized (boundAddresses)
{
053             localAddresses.addAll(boundAddresses);
054         }
055         return localAddresses;
056     }
057  
058     @Override
059     public void bind(SocketAddress
localAddress) throws IOException
{
060         //
TODO Auto-generated method stub
061  
062     }
063  
064     @Override
065     public void bind(Iterable<? extends SocketAddress>
localAddresses)
066             throws IOException
{
067         //
TODO isDisposing()
068  
069         if (localAddresses
== null)
{
070             throw new IllegalArgumentException("localAddresses");
071         }
072  
073         List<SocketAddress>
localAddressesCopy = new ArrayList<SocketAddress>();
074  
075         for (SocketAddress
a : localAddresses) {
076             //
TODO check address type
077             localAddressesCopy.add(a);
078         }
079  
080         if (localAddressesCopy.isEmpty())
{
081             throw new IllegalArgumentException("localAddresses
is empty");
082         }
083  
084         boolean active
= false;
085  
086         synchronized (bindLock)
{
087             synchronized (boundAddresses)
{
088                 if (boundAddresses.isEmpty())
{
089                     active
= true;
090                 }
091             }
092         }
093         /**
implement in abstractIoService */
094         if (getHandler()
== null)
{
095             throw new IllegalArgumentException("handler
is not set");
096         }
097  
098         try {
099             Set<SocketAddress>
addresses = bindInternal(localAddressesCopy);
100  
101             synchronized (boundAddresses)
{
102                 boundAddresses.addAll(addresses);
103             }
104         } catch (IOException
e) {
105             throw e;
106         } catch (RuntimeException
e) {
107             throw e;
108         } catch (Throwable
e) {
109             throw new RuntimeException("Filed
ti bind");
110         }
111          
112         if(active){
113             //do
sth
114         }
115     }
116  
117     protected abstract Set<SocketAddress>
bindInternal(
118             List<? extends SocketAddress>
localAddress) throws Exception;
119  
120     @Override
121     public void unbind(SocketAddress
localAddress) {
122         //
TODO Auto-generated method stub
123          
124     }
125 }

polling:

01 package org.apache.mina.core.rewrite.polling;
02  
03 import java.net.SocketAddress;
04 import java.nio.channels.ServerSocketChannel;
05 import java.util.List;
06 import java.util.Set;
07 import java.util.concurrent.Executor;
08 import java.util.concurrent.Semaphore;
09 import java.util.concurrent.atomic.AtomicReference;
10  
11 import org.apache.mina.core.rewrite.service.AbstractIoAcceptor;
12  
13 public abstract class AbstractPollingIoAcceptor extends AbstractIoAcceptor
{
14  
15     private final Semaphore
lock = new Semaphore(1);
16  
17     private volatile boolean selectable;
18  
19     private AtomicReference<Acceptor>
acceptorRef = new AtomicReference<Acceptor>();
20  
21     /**
22      *
define the num of sockets that can wait to be accepted.
23      */
24     protected int backlog
= 50;
25  
26     /**
27      *
一样的，这个构造方法也要写
28      *
29      *
@param param
30      *
@param executor
31      */
32     protected AbstractPollingIoAcceptor(Object
param, Executor executor) {
33         super(param,
executor);
34         //
TODO Auto-generated constructor stub
35     }
36  
37     /**
38      *
init the polling system. will be called at construction time
39      *
40      *
@throws Exception
41      */
42     protected abstract void init() throws Exception;
43  
44     protected abstract void destory() throws Exception;
45  
46     protected abstract int select() throws Exception;
47     /**这里有点儿变动*/
48     protected abstract ServerSocketChannel
open(SocketAddress localAddress) throws Exception;
49  
50     @Override
51     protected Set<SocketAddress>
bindInternal(
52             List<? extends SocketAddress>
localAddress) throws Exception
{
53         //
...
54         try {
55             lock.acquire();
56             Thread.sleep(10);
57         } finally {
58             lock.release();
59         }
60         //
...
61         return null;
62     }
63  
64     /**
65      *
this class is called by startupAcceptor() method it's a thread accepting
66      *
incoming connections from client
67      *
68      *
@author ChenHui
69      *
70      */
71     private class Acceptor implements Runnable
{
72         @Override
73         public void run()
{
74             assert (acceptorRef.get()
== this);
75  
76             int nHandles
= 0;
77  
78             lock.release();
79  
80             while (selectable)
{
81                 try {
82                     int selected
= select();
83  
84                     //
nHandles+=registerHandles();
85  
86                     if (nHandles
== 0)
{
87                         acceptorRef.set(null);
88                         //
...
89                     }
90                 } catch (Exception
e) {
91  
92                 }
93             }
94         }
95     }
96 }

好了最后看NioSoeketAcceptor:

001 package org.apache.mina.rewrite.transport.socket.nio;
002  
003 import java.net.InetSocketAddress;
004 import java.net.ServerSocket;
005 import java.net.SocketAddress;
006 import java.nio.channels.SelectionKey;
007 import java.nio.channels.Selector;
008 import java.nio.channels.ServerSocketChannel;
009 import java.util.concurrent.Executor;
010  
011 import org.apache.mina.core.rewrite.polling.AbstractPollingIoAcceptor;
012 import org.apache.mina.rewrite.transport.socket.SocketAcceptor;
013  
014 public final class NioSocketAcceptor extends AbstractPollingIoAcceptor
015         implements SocketAcceptor
{
016  
017     private volatile Selector
selector;
018  
019     protected NioSocketAcceptor(Object
param, Executor executor) {
020         super(param,
executor);
021         //
TODO Auto-generated constructor stub
022     }
023  
024     @Override
025     public int getManagedSessionCount()
{
026         //
TODO Auto-generated method stub
027         return 0;
028     }
029  
030     /**
031      *
这个方法继承自AbstractIoAcceptor
032      *
033      *
The type NioSocketAcceptor must implement the inherited abstract method
034      *
SocketAcceptor.getLocalAddress() to override
035      *
AbstractIoAcceptor.getLocalAddress()
036      */
037     @Override
038     public InetSocketAddress
getLocalAddress() {
039         //
TODO Auto-generated method stub
040         return null;
041     }
042  
043     @Override
044     public void setDefaultLocalAddress(InetSocketAddress
localAddress) {
045         //
TODO Auto-generated method stub
046  
047     }
048  
049     @Override
050     public boolean isReuseAddress()
{
051         //
TODO Auto-generated method stub
052         return false;
053     }
054  
055     @Override
056     protected void init() throws Exception
{
057         selector
= Selector.open();
058     }
059  
060     @Override
061     protected void destory() throws Exception
{
062         if (selector
!= null)
{
063             selector.close();
064         }
065     }
066  
067     @Override
068     protected int select() throws Exception
{
069         return selector.select();
070     }
071  
072     @Override
073     protected void dispose0() throws Exception
{
074         //
TODO Auto-generated method stub
075  
076     }
077  
078     protected ServerSocketChannel
open(SocketAddress localAddress)
079             throws Exception
{
080         ServerSocketChannel
channel =ServerSocketChannel.open();
081          
082         boolean success=false;
083          
084         try{
085             channel.configureBlocking(false);
086              
087             ServerSocket
socket=channel.socket();
088              
089             socket.setReuseAddress(isReuseAddress());
090              
091             socket.bind(localAddress);
092              
093             channel.register(selector,
SelectionKey.OP_ACCEPT);
094              
095             success=true;
096         }finally{
097             if(!success){
098                 //close(channel);
099             }
100         }
101         return channel;
102     }
103  
104     @Override
105     public boolean isActive()
{
106         //
TODO Auto-generated method stub
107         return false;
108     }
109  
110 }

------------------------------------------------------

到此为止将连接部分都写完了，在连接部分还有些零碎的东西，比如handler、polling，这些都只是稍稍提了一下，具体后面会在介绍其他部分是肯定还会碰上，我还是想把重心放在最主要的部分去写，下一篇应该要写到session了。

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