Silverlight 中实现Service同步调用
Silverlight中实现同步调用Service,核心是用到了MS的Interlocked.Increment.
Interlocked.Increment是做什么事情的？
如果有两个Thread ，分别记作threadA，threadB。
1：threadA将Value从存储空间取出，为0；
2：threadB将Value从存储空间取出，为0；
3：threadA将取出来的值和1作加法，并且将和放回Value的空间覆盖掉原值。加法结束，Value=1。
4：threadB将取出来的值和1作加法，并且将和放回Value的空间覆盖掉原值。加法结束，Value=1。
最后Value =1 ，而正确应该是2；这就是问题的所在，InterLockedIncrement 能够保证在一个线程访问变量时其它线程不能访问。
不废话了，直接上Demo了。
private BizModel bizModel = null; |
public void LoadData() |
{ |
int loadCompletedCount = 0; |
int wellLoadedCount = 3; |
RestService.Query<BizEntity>("/Biz1/1000",(obj,args)=> |
{ |
Interlocked.Increment(ref loadCompletedCount); |
//business code |
bizModel = args.Result.ToModel(); |
if (loadCompletedCount == wellLoadedCount) |
{ |
UpdateUIAfterLoadData(); |
} |
} |
RestService.Query<BizEntity>("/Biz2/1000",(obj,args)=> |
{ |
Interlocked.Increment(ref loadCompletedCount); |
//business code |
bizModel = args.Result.ToModel(); |
if (loadCompletedCount == wellLoadedCount) |
{ |
UpdateUIAfterLoadData(); |
} |
} |
RestService.Query<BizEntity>("/Biz3/1000",(obj,args)=> |
{ |
Interlocked.Increment(ref loadCompletedCount); |
//business code |
bizModel = args.Result.ToModel(); |
if (loadCompletedCount == wellLoadedCount) |
{ |
UpdateUIAfterLoadData(); |
} |
} |
} |
private void UpdateUIAfterLoadData() |
{ |
//Refresh UI by bizModel; |
} |
测试例子
public delegate void deleHeadler(object x, EventArgs e); |
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public class RestService |
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{ |
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public static void Query<T>(string s, deleHeadler del) |
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{ |
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Console.WriteLine(s); |
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for (int i = 0; i < 70000000; i++) |
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{ |
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} |
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del(null,null); |
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} |
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} |
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public class Program |
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{ |
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static void Main(string[] args) |
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{ |
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int wellLoadedCount = 2; |
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int loadCompletedCount = 0; |
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RestService.Query<string>("1", |
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(obj, argsOne) => |
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{ |
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Interlocked.Increment(ref loadCompletedCount); |
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if (loadCompletedCount == wellLoadedCount) |
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{ |
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UpdateUIAfterLoadData(); |
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} |
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}); |
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RestService.Query<string>("2", |
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(obj, argsTwo) => |
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{ |
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Interlocked.Increment(ref loadCompletedCount); |
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if (loadCompletedCount == wellLoadedCount) |
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{ |
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UpdateUIAfterLoadData(); |
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} |
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}); |
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Console.ReadKey(); |
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} |
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|
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private static void UpdateUIAfterLoadData() |
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{ |
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Console.WriteLine("全部加载完毕"); |
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} |
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} |
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