• “Hello World” Example with AspectDNG



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    6. “Hello World” Example with AspectDNG

    In this chapter, let’s try to use AspectDNG to do an AOP example together. 

    Firstly, I define the base and aspect assemblies as below:

    TestBaseClass.cs in BaseLib.dll

    using System;

    namespace BaseLib
    {
        
    /// <summary>
        
    /// Summary description for TestBaseClass.
        
    /// </summary>

        public class TestBaseClass
        
    {
            
    public TestBaseClass()
            
    {
            }


            
    public void MethodToBeDeleted()
            
    {
            }


            
    public void MethodWarningToBeAdded()
            
    {
            }


            
    public void MethodErrorToBeAdded()
            
    {
            }


            
    public void MethodToTestInlineConstructorCall()
            
    {
                
    object obj = new TestBaseClass();
            }


            
    public void MethodToTestInlineMethod()
            
    {
            }


            
    public void MethodToTestInlineMethodCall()
            
    {
                MethodToTestInlineMethod();
            }


            
    private string fieldToTestInlineField = "fieldToTestInlineField";

            
    public void MethodToTestInlineFieldAccess()
            
    {
                
    string str = fieldToTestInlineField;
                fieldToTestInlineField 
    = "WriteFieldToTestInlineField";
            }


            
    public void MethodToTestAroundBody()
            
    {
                Console.Write(
    "MethodToTestAroundBody");
            }


            
    public void MethodToTestAroundCall()
            
    {
                MethodToTestAroundBody();
            }

        }

    }

    TestAspectClass.cs in AspectLib.dll

    using System;

    namespace AspectLib
    {
        
    /// <summary>
        
    /// Summary description for TestAspectClass.
        
    /// </summary>

        public class TestAspectClass
        
    {
            
    public TestAspectClass()
            
    {
            }


            
    public void CodeToBeAddedAsInlineBeforeConstuctorCall()
            
    {
                Console.Write(
    "CodeToBeAddedAsInlineBeforeConstuctorCall");
            }


            
    public void CodeToBeAddedAsInlineAfterConstuctorCall()
            
    {
                Console.Write(
    "CodeToBeAddedAsInlineAfterConstuctorCall");
            }


            
    public void CodeToBeAddedAsInlineBeforeMethodCall()
            
    {
                Console.Write(
    "CodeToBeAddedAsInlineBeforeMethodCall");
            }


            
    public void CodeToBeAddedAsInlineAfterMethodCall()
            
    {
                Console.Write(
    "CodeToBeAddedAsInlineAfterMethodCall");
            }


            
    public void CodeToBeAddedAsInlineAtStart()
            
    {
                Console.Write(
    "CodeToBeAddedAsInlineAtStart");
            }


            
    public void CodeToBeAddedAsInlineBeforeReturn()
            
    {
                Console.Write(
    "CodeToBeAddedAsInlineBeforeReturn");
            }


            
    public void CodeToBeAddedAsInlineBeforeFieldReadAccess()
            
    {
                Console.Write(
    "CodeToBeAddedAsInlineBeforeFieldReadAccess");
            }


            
    public void CodeToBeAddedAsInlineBeforeFieldWriteAccess()
            
    {
                Console.Write(
    "CodeToBeAddedAsInlineBeforeFieldWriteAccess");
            }


            
    public void CodeToBeAddedAsInlineAfterFieldReadAccess()
            
    {
                Console.Write(
    "CodeToBeAddedAsInlineAfterFieldReadAccess");
            }


            
    public void CodeToBeAddedAsInlineAfterFieldWriteAccess()
            
    {
                Console.Write(
    "CodeToBeAddedAsInlineAfterFieldWriteAccess");
            }


            
    public void CodeToBeAddedAsAroundBody()
            
    {
                Console.Write(
    "CodeToBeAddedAsAroundBody");
            }


            
    public void CodeToBeAddedAsAroundCall()
            
    {
                Console.Write(
    "CodeToBeAddedAsAroundCall");
            }


        }


        
    public class TestClassToBeInserted
        
    {
        }

    }

    The AspectDngConfig and Advice configuration are as below:

    AspectDngConfig.xml

    <?xml version="1.0" encoding="utf-8"?>
    <AspectDngConfig xmlns="http://www.dotnetguru.org/AspectDNG"
        debug
    ="false" 
        logWarnings
    ="true" logWarningsPath="Warnings.log"
        logIlml
    ="true" logIlmlPath="BaseLib.ilml.xml"
        logWeaving
    ="true" logWeavingPath="BaseLib.weaving.xml"
        validateRules
    ="true">
        
        
    <BaseAssembly>BaseLib/bin/Debug/BaseLib.dll</BaseAssembly>
        
    <AspectsAssembly>AspectLib/bin/Debug/AspectLib.dll</AspectsAssembly>
        
        
    <AdviceFiles>
            
    <AdviceFile>HelloAspectDngAdvice.xml</AdviceFile>
        
    </AdviceFiles>
    </AspectDngConfig>

    HelloAspectDngAdvice.xml

    <Advice xmlns="http://www.dotnetguru.org/AspectDNG">
        
    <Delete 
            
    targetXPath="//Method[@name = 'MethodToBeDeleted']"/>
            
        
    <Insert 
            
    aspectXPath="//Type[@name = 'TestClassToBeInserted']"
            targetXPath
    ="//Module"/>

        
    <!--<Warning 
            targetXPath="//Method[@name = 'MethodWarningToBeAdded']"/>
    -->

        
    <!--<Error 
            targetXPath="//Method[@name = 'MethodErrorToBeAdded']"/>
    -->
        
        
    <!--<MakeSerializable 
            targetXPath="//Method[@name = 'TestBaseClass']"/>
    -->
            
        
    <!--<SetBaseType 
            aspectXPath="//Type[@name = 'TestClassToBeInserted']"
            targetXPath="//Type[@name = 'TestBaseClass']"/>
    -->
        
        
    <!--<InlineBeforeConstructorCall 
            aspectXPath="//Method[@name = 'CodeToBeAddedAsInlineBeforeConstuctorCall']"
            targetXPath="//TestBaseClass/Constructor"/>
        
        <InlineAfterConstructorCall 
            aspectXPath="//Method[@name = 'CodeToBeAddedAsInlineAfterConstuctorCall']"
            targetXPath="//TestBaseClass/Constructor"/>
        
        <InlineBeforeMethodCall 
            aspectXPath="//Method[@name = 'CodeToBeAddedAsInlineBeforeMethodCall']"
            targetXPath="//Method[@name = 'MethodToTestInlineMethod']"/>
        
        <InlineAfterMethodCall 
            aspectXPath="//Method[@name = 'CodeToBeAddedAsInlineAfterMethodCall']"
            targetXPath="//Method[@name = 'MethodToTestInlineMethod']"/>
        
        <InlineBeforeFieldReadAccess 
            aspectXPath="//Method[@name = 'CodeToBeAddedAsInlineBeforeFieldReadAccess']"
            targetXPath="//Field[@name = 'fieldToTestInlineField']"/>
        
        <InlineAfterFieldReadAccess 
            aspectXPath="//Method[@name = 'CodeToBeAddedAsInlineAfterFieldReadAccess']"
            targetXPath="//Field[@name = 'fieldToTestInlineField']"/>
        
        <InlineBeforeFieldWriteAccess 
            aspectXPath="//Method[@name = 'CodeToBeAddedAsInlineBeforeFieldWriteAccess']"
            targetXPath="//Field[@name = 'fieldToTestInlineField']"/>
        
        <InlineAfterFieldWriteAccess 
            aspectXPath="//Method[@name = 'CodeToBeAddedAsInlineAfterFieldWriteAccess']"
            targetXPath="//Field[@name = 'fieldToTestInlineField']"/>
    -->
            
        
    <InlineAtStart 
            
    aspectXPath="//Method[@name = 'CodeToBeAddedAsInlineAtStart']"
            targetXPath
    ="//Method[@name = 'MethodToTestInlineMethod']"/>
        
        
    <InlineBeforeReturn
            
    aspectXPath="//Method[@name = 'CodeToBeAddedAsInlineBeforeReturn']"
            targetXPath
    ="//Method[@name = 'MethodToTestInlineMethod']"/>
        
        
    <!--<AroundCall 
            aspectXPath="//Method[@name='CodeToBeAddedAsAroundCall']"
            targetXPath="//Method[@name = 'MethodToTestAroundBody']"/>
    -->
        
        
    <AroundBody 
            
    aspectXPath="//Method[@name='CodeToBeAddedAsAroundBody']"
            targetXPath
    ="//Method[@name = 'MethodToTestAroundBody']"/>
    </Advice>

    After execute the command:

    aspectdng.exe –w AspectDngConfig.xml

    BaseLib.dll is statically weaved and the source code (decompiled by Salamander) becomes below:

    // Decompiled by Salamander version 1.0.6
    // Copyright 2002 Remotesoft Inc. All rights reserved.
    // http://www.remotesoft.com/salamander

    using System;

    namespace BaseLib
    {
      
    public class TestBaseClass
      
    {
        
    private string fieldToTestInlineField = "fieldToTestInlineField";


        
    public void MethodWarningToBeAdded()
        
    {
        }


        
    public void MethodErrorToBeAdded()
        
    {
        }


        
    public void MethodToTestInlineConstructorCall()
        
    {
          
    object local = new TestBaseClass();
        }


        
    public void MethodToTestInlineMethod()
        
    {
          Console.Write(
    "CodeToBeAddedAsInlineAtStart");
          Console.Write(
    "CodeToBeAddedAsInlineBeforeReturn");
        }


        
    public void MethodToTestInlineMethodCall()
        
    {
          MethodToTestInlineMethod();
        }


        
    public void MethodToTestInlineFieldAccess()
        
    {
          
    string str = fieldToTestInlineField;
          fieldToTestInlineField 
    = "WriteFieldToTestInlineField";
        }


        
    public void MethodToTestAroundBody_9e793e7d-2628-4b5d-adf4-c089248c9ee7()
        
    {
          Console.Write(
    "MethodToTestAroundBody");
        }


        
    public void MethodToTestAroundCall()
        
    {
          MethodToTestAroundBody();
        }


        
    public void MethodToTestAroundBody()
        
    {
          Console.Write(
    "CodeToBeAddedAsAroundBody");
        }

      }


    }

    Conclusion

    The uncommented operations defined in HelloAspectDngAdvice.xml are executed successfully. The commented code was also tested, but either failed or ignored by AspectDNG, seams they haven’t been supported correctly or not supported yet. And we can also check the weaving log file. 

    BaseLib.weaving.xml

    <WeaveLog>
      
    <Weave name="Delete" targetXPath="//Method[@name = 'MethodToBeDeleted']">
        
    <WeaveStep>
          
    <TargetInfo>System.Void BaseLib.TestBaseClass::MethodToBeDeleted()</TargetInfo>
        
    </WeaveStep>
      
    </Weave>
      
    <Weave name="Insert" aspectXPath="//Type[@name = 'TestClassToBeInserted']" targetXPath="//Module">
        
    <WeaveStep>
          
    <AspectInfo>AspectLib.TestClassToBeInserted</AspectInfo>
          
    <TargetInfo>BaseLib.dll</TargetInfo>
        
    </WeaveStep>
      
    </Weave>
      
    <Weave name="InlineAtStart" aspectXPath="//Method[@name = 'CodeToBeAddedAsInlineAtStart']" targetXPath="//Method[@name = 'MethodToTestInlineMethod']">
        
    <WeaveStep>
          
    <AspectInfo>System.Void AspectLib.TestAspectClass::CodeToBeAddedAsInlineAtStart()</AspectInfo>
          
    <TargetInfo>System.Void BaseLib.TestBaseClass::MethodToTestInlineMethod()</TargetInfo>
        
    </WeaveStep>
      
    </Weave>
      
    <Weave name="InlineBeforeReturn" aspectXPath="//Method[@name = 'CodeToBeAddedAsInlineBeforeReturn']" targetXPath="//Method[@name = 'MethodToTestInlineMethod']">
        
    <WeaveStep>
          
    <AspectInfo>System.Void AspectLib.TestAspectClass::CodeToBeAddedAsInlineBeforeReturn()</AspectInfo>
          
    <TargetInfo>System.Void BaseLib.TestBaseClass::MethodToTestInlineMethod()</TargetInfo>
        
    </WeaveStep>
      
    </Weave>
      
    <Weave name="AroundBody" aspectXPath="//Method[@name='CodeToBeAddedAsAroundBody']" targetXPath="//Method[@name = 'MethodToTestAroundBody']">
        
    <WeaveStep>
          
    <AspectInfo>System.Void AspectLib.TestAspectClass::CodeToBeAddedAsAroundBody()</AspectInfo>
          
    <TargetInfo>System.Void BaseLib.TestBaseClass::MethodToTestAroundBody()</TargetInfo>
        
    </WeaveStep>
      
    </Weave>
    </WeaveLog>

    Source Code Download

    HelloAspectDNG.zip
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  • 原文地址:https://www.cnblogs.com/teddyma/p/240364.html
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