From 5c3ef04a5aa615b965732a98e722a436e2a74644 Mon Sep 17 00:00:00 2001 From: Peter Donald Date: Mon, 18 Dec 2000 14:33:44 +0000 Subject: [PATCH] oops - forgot to add contents of directory ;) git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@268367 13f79535-47bb-0310-9956-ffa450edef68 --- proposal/frantic/website/Task.html | 471 ++++++++++++++++++ .../frantic/website/images/frantic_logo.gif | Bin 0 -> 20920 bytes .../frantic/website/images/task_hierarchy.gif | Bin 0 -> 2592 bytes proposal/frantic/website/index.html | 217 ++++++++ 4 files changed, 688 insertions(+) create mode 100644 proposal/frantic/website/Task.html create mode 100644 proposal/frantic/website/images/frantic_logo.gif create mode 100644 proposal/frantic/website/images/task_hierarchy.gif create mode 100644 proposal/frantic/website/index.html diff --git a/proposal/frantic/website/Task.html b/proposal/frantic/website/Task.html new file mode 100644 index 000000000..73c808f8a --- /dev/null +++ b/proposal/frantic/website/Task.html @@ -0,0 +1,471 @@ + + + + + + +: Interface Task + + + + + + + + + + + + + + + + + + + + + +
+ + + + + + + + + +
 Class  Tree  Deprecated  Index  Help 
+		 + +
+ PREV CLASS  + NEXT CLASS + FRAMES   + NO FRAMES
+ SUMMARY:  INNER | FIELD | CONSTR | METHOD +DETAIL:  FIELD | CONSTR | METHOD
+ + +
+ +

+ +org.apache.ant.tasks +
+Interface Task

+
+
+
public interface Task
+ +

+Task is the core interface for all structures that will be processed by the + TaskEngine. +

+

+ +

+ + + + + + + + + + + + + + + + + + + + + + + + + + +
+Field Summary
+static intEXECUTION_MODE_EXPLICIT + +
+           
+static intEXECUTION_MODE_IMPLICIT + +
+           
+static intEXECUTION_MODE_PRIORITY + +
+           
+static charNAME_SEPARATOR + +
+           
+  + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
+Method Summary
+ voidexecute(org.apache.ant.engine.TaskEngine engine) + +
+          Causes the existing Task implementation to execute.
+ java.lang.StringgetAttributeValue(java.lang.String name) + +
+          Each Task will hold its attributes in some manner.
+ Task[]getChildren() + +
+          Returns the an array of Task objects that are subordinate to this Task.
+ intgetExecutionMode() + +
+          Determines whether this Task is executed whenever its parent is executed, + or if its execution must be specifically requested.
+ java.lang.StringgetFullyQualifiedName() + +
+          The "fully-qualified" name of a Task is the Task's name, prepended by its + parent's name, prepended by its parent's name, etc.
+ TaskgetParent() + +
+          Returns this Task's parent Task.
+ TaskgetRootTask() + +
+          Proceed backwards through the nodes until we come across the first Task + in the tree.
+ TaskgetTask(java.lang.String taskPath) + +
+          A mechanism for locating a task relative to the current task.
+ java.lang.StringgetTaskName() + +
+          Just a simple name used to identify a Task.
+ voidinit(org.apache.ant.engine.TaskEngine engine) + +
+          Called when the Task first gets "noticed" by the TaskEngine.
+ booleanisPropertyContainer() + +
+          Determines whether a Task is suitable for holding property values.
+ voidsetParent(Task parent) + +
+          Sets the Task's parent.
+ voidvalidate() + +
+          Each Task should have the ability to validate its state.
+  +

+ + + + + + + + +
+Field Detail
+ +

+EXECUTION_MODE_IMPLICIT

+
+public static final int EXECUTION_MODE_IMPLICIT
+
+
+
+ +

+EXECUTION_MODE_EXPLICIT

+
+public static final int EXECUTION_MODE_EXPLICIT
+
+
+
+ +

+EXECUTION_MODE_PRIORITY

+
+public static final int EXECUTION_MODE_PRIORITY
+
+
+
+ +

+NAME_SEPARATOR

+
+public static final char NAME_SEPARATOR
+
+
+ + + + + + + + + + + +
+Method Detail
+ +

+execute

+
+public void execute(org.apache.ant.engine.TaskEngine engine)
+             throws org.apache.ant.AntException
+
+
Causes the existing Task implementation to execute.
+
+ +

+init

+
+public void init(org.apache.ant.engine.TaskEngine engine)
+          throws org.apache.ant.AntException
+
+
Called when the Task first gets "noticed" by the TaskEngine.
+
+ +

+validate

+
+public void validate()
+              throws org.apache.ant.AntException
+
+
Each Task should have the ability to validate its state. This would be + invoked by the TaskEngine prior to commencing an execution cycle.
+
+ +

+getTaskName

+
+public java.lang.String getTaskName()
+
+
Just a simple name used to identify a Task. This name is only sufficient + for simple debugging and GUI output. It does not uniquely identify a + Task.
+
See Also:
getFullyQualifiedName()
+
+
+
+ +

+getTask

+
+public Task getTask(java.lang.String taskPath)
+
+
A mechanism for locating a task relative to the current task. This + navigation sceme will mimic a typical OS system. '..' will move back + a level in the Task tree. If taskPath begins with '/' then the root node + will be used as a starting point. +

+ Returns null of no task is found at this location.
+
+ +

+getRootTask

+
+public Task getRootTask()
+
+
Proceed backwards through the nodes until we come across the first Task + in the tree. This is the root Task.
+
+ +

+getFullyQualifiedName

+
+public java.lang.String getFullyQualifiedName()
+
+
The "fully-qualified" name of a Task is the Task's name, prepended by its + parent's name, prepended by its parent's name, etc. This method may be + used by the Task's hashCode() method to calculate a hash that will + uniquely identify a Task.
+
+ +

+getExecutionMode

+
+public int getExecutionMode()
+
+
Determines whether this Task is executed whenever its parent is executed, + or if its execution must be specifically requested. +

+
EXECUTION_MODE_EXPLICIT
+
Requires interaction by the TaskEngine in order to execute.
+
EXECUTION_MODE_IMPLICIT
+
This Task is automatically executed when its parent is + executed.
+
EXECUTION_MODE_PRIORITY
+
These Tasks are executed prior to its parent's execution
+

+ The default mode should probably be EXECUTION_MODE_IMPLICIT. In the + build domain of Ant, every Task below a Task will normally be executed. + The major exception to this is the Target. When a Project Task is + executed, all Target Tasks do not automatically fire, however all + Property Tasks do execute.
+
+ +

+isPropertyContainer

+
+public boolean isPropertyContainer()
+
+
Determines whether a Task is suitable for holding property values.
+
+ +

+getAttributeValue

+
+public java.lang.String getAttributeValue(java.lang.String name)
+
+
Each Task will hold its attributes in some manner. This method will allow + the Task implementation to return the value of its attribute.
+
+ +

+getParent

+
+public Task getParent()
+
+
Returns this Task's parent Task. If this Task is the root Task, then this + method will return null.
+
+ +

+setParent

+
+public void setParent(Task parent)
+
+
Sets the Task's parent.
+
+ +

+getChildren

+
+public Task[] getChildren()
+
+
Returns the an array of Task objects that are subordinate to this Task.
+ +
+ + + + + + + + + + + + + + + + + +
+ + + + + + + + + +
 Class  Tree  Deprecated  Index  Help 
+		 + +
+ PREV CLASS  + NEXT CLASS + FRAMES   + NO FRAMES
+ SUMMARY:  INNER | FIELD | CONSTR | METHOD +DETAIL:  FIELD | CONSTR | METHOD
+ + +
+ + + diff --git a/proposal/frantic/website/images/frantic_logo.gif b/proposal/frantic/website/images/frantic_logo.gif new file mode 100644 index 0000000000000000000000000000000000000000..fe40da48c5c81cbdf3a3e0fd1877aed721ea0af4 GIT binary patch literal 20920 zcmWh!dpuMB|3AAAGh@Tt=RVgax!*SA7Mk4VK9{7DMlPeYTM=sHR?&wpQmN)r z=|Uq(B~2v~MXA(R?dSK;dA$ES=e*yq%k%YoKHr|+9=3L|e*h%t7XZBEx=l|{AMmr< z*w`ozQXd~5mprWen3or}l~{jtR~Z1@&JE`jHT?eldt_wf1CyBn00RR9w{G2f;p5hn z8x$P2M>0RhEo%Aq>bYdFKyr(@wzf750{wmW`b4Mws()OuC6Xs z`*?Wz2t#GL!5D85MMXtv?#j!{%Wr73+2rJ`!~DlBr&0~|B#-(JXEXcr zBBKC6GB%u^Q!?e?pr>zits3TTu4hV`S|hU`%=$d00<2YmGt*o zSvz{}2z^vmyujx_)7L)~7QEK5T}cVQ&|9=k7k_|}e=M(N?ap;ud$+wwNu@qM%>eLU zNx0;UQ%72A*FN2nSl1j@MMJBQ!^xd*Y7BKXyL~dwNKIi(RrPy?#R*nwlijxQbLl;T z%JcsIp#-(VxmA@J{>5g-M>y4z+HDar$>%evN4Y0o4qUmNYQQQuJzNxX<#6!dH@BTB z-WLi(>tZb=t84Suud@=j|NB1wZ?xfe_14z>JySJdwZ)u|!xxQANaM$h2Q!@)UOms= zOTU@!F!x{Q#L2`_G+MH@e*N^}FDJJ62gIy)?rY3F(tELK`O(8fXToAjZ0nwF>I$fp 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Ant + 2.0 Proposal

+

Code Name - Frantic

+

Frantic hardly describes the proposal process...more like my coding and design + efforts! I am relatively new to Ant and the mail list, and I have posted several + emails recently regarding the use of DOM in the future of Ant. Once I discovered + the mail archive (thanks Simeon), I had a chance to notice that many of my questions + were asked before. My extemporaneous emails were not without consequence it + seems. After writing one of them it set some wheels in motion for what I hope + is a useful addition to the current (and growing) number of proposals for Ant + 2.0.

+
+ + + + +
+ + + + +
+

I think the concept behind Ant should be changed to be a "Task + Execution Engine", and the concept of Project and Target can be + generalized into a specific form of a Task.

+
+
+
+

 

+

The email list has received some requests from developers to extend Ant to + support different problem domains. Peter Donald has latched onto this issue + and I understand that he has incorporated some of these ideas into his Ant proposal. + I also have seen some very impressive DOM support integrated into Antidote, + an elegant basis for a GUI editor crafted by Simeon Fitch. Sim achieves a great + deal of flexibility by using the W3C DOM as a superclass to his Project/Target/Task + objects. He has, in effect, abstracted each of these "core" Ant objects + until they are simply DOM nodes.

+

Peter's and Sim's ideas struck a chord and I thought that Peter's desire to + allow Ant to break free from the Build domain and into Install domains by extending + Ant, could be achieved by looking at the problem from a different point of view. + As I stated in my email, we can achieve a much higher degree of flexibility + in Ant by generalizing more.

+

Design Proposal

+

I believe that Ant 2.0 should be re-termed a Task Execution Engine, + and the core of Ant becomes the Engine and the Task. This seems a little radical + considering that the Project/Target/Task object model has served us so well + in Ant 1.x, however it is very clear that Project and Target are simple another + type of Task.

+

An enormous amount of code has been added to maintain Project and Target as + separate classes with distinct, hard-coded behaviors. From the proof-of-concept + code that I have been developing, I am inspired by how much more elegant the + code becomes when this simplified model is realized.

+ +

Having a base Task interface that all Tasks implement will also offer a generalized + approach that benefits GUI's in much the same manner that the DOM has helped + Antidote. Also, by making Task an interface instead of a class, we can finally + free ourselves of implementation specifics.

+

As I was writing the concept code, it struck me that I was too worried about + the XML. Simeon Fitch mentioned in an email in early December, the possibility + of storing build scripts in a database. I think this, along with various comments + about DOM dependencies from Peter Donald, Jose Alberto Fernandez, and Stefan + Bodewig made me realize that Core Ant shouldn't care where the build script + lives or in which format it is stored. It is the object model that is primarily + important.

+

The Task

+

The cornerstone of this proposal hinges on the Task + Interface. It is the only type of external object that the Execution Engine + knows how to handle. It is in this simplicity that the most powerful Ant can + be realized.

+

The Task is an object that is aware of it's place in ahierarchy. To this end + it is aware of its parent and its children. Please note that this is a runtime + dependency and a scripting language (or the Task itself) can dynamically change + the relationship of Tasks.

+ + + + + + + +
+
Figure 1
+
+

Key to being able to manipulate Tasks at runtime is some sort of naming conventions. + Currently in the Frantic design is the concept of a Task name. Tasks, being + hierarchical, can be thought of as a directory structure (see figure 1). If + each Task is assigned a name that is unique among its siblings, we can then + have a powerful means of locating and referencing a particular Task anywhere + in the hierarchy.

+

For example, the Property Task below the Target named "build" has + a name of "prop3", however its "fully-qualified" name is + /root/build/prop3. The root of a Task execution list is "/" and the + tag name, in our example /root. In the concept source code I use this principal + of hierarchical naming to support dependencies. Currently, I am treating these + Task names as directories and not as files. This should perhaps change slightly + to the filename approach. In the directory-based approach, a sibling is named + "../sibling". It would be more convenient to not require the "../". + In fact, I think I have convinced myself of this.

+

Task Discovery

+

I haven't coded this portion, however I plan on basing it on Duncan's idea + of using the Jar manifests to locate and identify tasks on the classpath. I + was first exposed to this technique in the OpenTools API of Borland's JBuilder + IDE, and I have since used it on a large project for a consulting customer.

+

The classpath is scanned at runtime to locate all directories and jar files. + These directories and jar files will have a manifest file that will contain + manifest entries that serve to tie a string token to the Task implementation + class responsible for that token. Directories cannot have manifests per se, + but we will utilize a file, one-level up from the directory, with a name "directory-name.mf". + This file will be in the format of a manifest file. This will allow developers + to create and test new Tasks without the burden of having to make a Jar archive + every time.

+

Attribute Validation

+

Brett McLaughlin introduced a very interesting techique to perform object validation + using XML Schema in a series of JavaWorld + articles. I can see this technique applied to Tasks as well. The user could + include a schema with a special name in the jar file that accompanies the Tasks. + This schema could be used at runtime to validate a Task's attributes.

+

I would imagine that this feature would be outside of what is considered "core" + Ant.

+

The Execution Engine

+

The engine only knows how to process Task objects, and that is what makes it + extremely efficient. It is modeled after how I believe a compiler, or command + interpreter would function. It contains a call stack which I call a task + stack, and this task stack is under complete control of the engine. + This is not to say that Tasks cannot manipulate the task stack at runtime, because + they do. However, all of this access takes place under the watchful eye of the + execution engine.

+

Properties

+

Keeping track of properties is closely tied to the execution engine, and I + modeled it in a manner consistent with how I believe compilers must work. I + use the concept of a hierarchical series of hashtables that support the concept + of scope in property lists.

+

I had originally put the concept of a property into a Task and completely implemented + the bugger. It turned out during testing that my logic was flawed. It seemed + to work well at first...a property defined in a Task would be available to all + child Tasks, but unavailable to any ancestors. When a Task requested the latest + data on a property, it would look in its property list. If it wasn't found there, + it would look in its parent's list, and so on. Instant scope.

+

However, it became quickly apparent that properties are a "runtime" + consideration. This is something that Jose Alberto Fernandez will not let any + of us forget for long. :-) What I needed was to move this hierarchical chain + of property lists into the engine. For each new Task executed, a new property + list is created and also pushed onto the stack. It seems to work like a champ.

+

I also coded up key substitution into the getParameterValue() events. They + seem to work fine, although I haven't worked up enough test cases to be sure.

+

One additional cool feature is that parameters need not only hold Strings. + I thought that there would be occasions where properties will hold Tasks as + well. I believe this will turn out to be a prime mechanism for creating reference + id Tasks like the current FileSet objects and referring to them in other Tasks + just as you would any property value.

+

Attributes

+

I haven't spent any time addresing what is currently referred to a Task's attributes + in Ant 1.x. I still need to think about this concept some more, but as I dwell + on what an attribute is, I keep coming back to the properties. Just like a property + functions as a scoped variable, an attribute is the same thing. Albeit, its + scope is limited to the Task that uses it, but so what.

+

Execution Events

+

The execution engine also supports a few key events that can occur during the + execution lifecycle. Currently events exist for execution start/finish, task + start/execute/finish, exceptions, and simple messaging. The messaging event + allows Tasks to communicate in a standard way that will leverage the engine's + event system to allow various front-ends to intelligently and appropriately + process the output.

+

Scripting

+

I have no experience with incorporating a scripting engine into an engine, + but I do know that this proposal should address the primary issues that surround + such an integration. I think that two features which are absolutely essential + are:

+

Provide some sort of naming convention such that a particular Task can be + found given an absolute name or a name relative to another Task. This is complete + and working in the concept code.

+

Leave all decisions regarding property evaluation and Task's knowledge of these + properties until the last possible moment.

+

Recursive Tasks

+

I realize that Ant 1.x spent some clock cycles dedicated to resolving circular + references in the Task definitions. I didn't spend any time on that intentionally. + I am not so sure that the elimination of circular references is a good idea. + Especially moving forward, with the incorporation of a scripting language, I + can envision Tasks the assembler wants to execute repeatedly, perhaps even recursively. + I think we should treat this the same way that any modern computer language + would — caveat emptor.

+

Summary

+

There is a lot more to do with this proposal and the concept code. It has been + an exciting weekend getting these thoughts down and trying to back them up. + I look forward to collaborating with others on the list if they wish to help + me, even though I am in proposal phase. I certainly don't know much about XML + parsing and I could use some ideas on how to further my starting model. I would + love to show the Ant core model built in a Builder agnostic manner. Basically, + I want XML to be an option, not a requirement.

+

I would also be interested in perhaps building an adapter task that will allow + Ant 1.x tasks to be reused unchanged in the Frantic proposal. The concept of + a Task hasn't changed much, so perhaps this is a possibility.

+

As always, your feedback is welcome. I expect that I have missed some major + holes and I would like the opportunity to work with others to plug them up!

+

Jim Cook
+ Visual XS

+ +