vb.net barcode maker init: do-echo: [echo] ${arg1} -- ${arg2} -- original arg3 in Java

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init: do-echo: [echo] ${arg1} -- ${arg2} -- original arg3
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Now let s add a new target, which invokes the target via <antcall>:
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<target name="call-echo" depends="init"> <property name="arg1" value="original arg1" /> <property name="arg2" value="original arg2" /> <echo>calling...</echo> <antcall target="do-echo"> <param name="arg1" value="overridden"/> </antcall> <echo>...returned</echo> </target>
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This target defines some properties and then calls the do-echo target with one of the parameters overridden. The <param> element inside the <antcall> target is a REMOTE DEPLOYMENT TO TOMCAT 183
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direct equivalent of the <property> task: all named parameters become properties in the called target s context, and all methods of assigning properties in that method (value, file, available, resource, location, and refid)can be used. In this declaration, we have used the simple, value-based assignment. The output of running Ant against that target is:
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init: call-echo: [echo] calling... init: do-echo: [echo] overridden -- original arg2 -- original arg3 [echo] ...returned
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The first point to notice is that the init target has been called twice, once because call-echo depended upon it, the second time because do-echo depended upon it; the second time both init and call-echo were called, it was in the context of the <antcall>. The second point to notice is that now the previously undefined properties, arg1 and arg2, have been set. The arg1 parameter was set by the <param> element inside the <antcall> declaration; the arg2 parameter was inherited from the current context. The final observation is that the final trace message in the call-echo target only appears after the echo call has finished. Ant has executed the entire dependency graph of the do-echo target as a subbuild within the new context of the defined properties. The task has one mandatory attribute, target, which names the target to call, and two optional Boolean attributes, inheritall and inheritrefs. The inheritall flag controls whether the task passes all existing properties down to the invoke target, which is the default behavior. If the attribute is set to false , only those defined in the task declaration are passed down. To demonstrate this, we add another calling target:
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<target name="call-echo2" depends="init"> <property name="arg1" value="original arg1" /> <property name="arg2" value="original arg2" /> <echo>calling...</echo> <antcall target="do-echo" inheritall="false"> <param name="arg1" value="newarg1"/> </antcall> <echo>...returned</echo> </target>
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When you execute this target the log showed that do-echo did not know the definition of arg2, as it was not passed down:
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[echo] newarg1 -- ${arg2} -- original arg3
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Note that arg3 is still defined, because the second invocation of the init target will have set it; all dependent tasks are executed in an <antcall>. Effectively, arg3 has been redefined to the same value it held before. 184
DEPLOYMENT
Regardless of the inheritance flag setting, Ant always passes down any properties explicitly set on the command line. This ensures that anything manually overridden on the command line stays overridden, regardless of how you invoke a target. Take, for example, the command line
ant -f antcall.xml call-echo2 -Darg2=predefined -Darg1=defined
This results in an output message of
[echo] defined -- predefined -- original arg3
This clearly demonstrates that any properties defined on the command line override anything set in the program, no matter how hard the program tries to avoid it. This is actually very useful when you do want to control a complex build process from the command line. You can also pass references down to the invoked target. If you set inheritrefs="true", all existing references are defined in the new context . You can create new references from existing ones by including a <reference> element in the <antcall> declaration, stating the name of a new reference to be created using the value of an existing path or other reference:
<reference refid="compile.classpath" torefid="execution.classpath" />
This is useful if the invoked target needs to use some path or patternset as one of its customizable parameters. Now that we have revealed how to rearrange the order and context of target execution, we want to state that you should avoid getting into the habit of using <antcall> everywhere, which some Ant beginners do. The Ant run time makes good decisions about the order in which to execute tasks; a target containing nothing but a list of <antcall> tasks is a poor substitute. 7.6.2 Using <antcall> in deployment Our first invocation of the deployment target will be to deploy to our local machine, using the remote deployment target. This acts as a stand-alone test of the deployment target, and if it works, it eliminates the need to have a separate target for remote deployment. It relies on the fact that Ant bypasses the FTP target if the property ftp.login is undefined; instead of uploading the files, we simply set the target.directory property to the location of the expanded WAR file:
<target name="deploy-localhost-remotely" depends="dist"> <antcall target="deploy-and-verify"> <param name="target.server" value="127.0.0.1"/> <param name="target.appname" value="antbook"/> <param name="target.username" value="admin"/> <param name="target.password" value="password"/> <param name="target.directory" value="${warfile.asdir}"/> </antcall> </target>
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