Getting Started

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(Where to start)
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I wish someone had told me...
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This page contains some helpful tips for people who are planning on learning E.
==Where to start==
==Where to start==
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**org.erights.e.facet.makeCaretaker.emaker: An implementation of the [[http://www2.deltamobile.com/wiki/Walnut/Secure_Distributed_Computing/Capability_Patterns#Revocable_Capabilities|Revocable Capabilities]] pattern
**org.erights.e.facet.makeCaretaker.emaker: An implementation of the [[http://www2.deltamobile.com/wiki/Walnut/Secure_Distributed_Computing/Capability_Patterns#Revocable_Capabilities|Revocable Capabilities]] pattern
**org.erights.e.elib.slot.makeLamportSlot.emaker: An implementation of the [http://www.erights.org/javadoc/org/erights/e/elib/slot/EverReporter.html EverReporter] pattern/interface
**org.erights.e.elib.slot.makeLamportSlot.emaker: An implementation of the [http://www.erights.org/javadoc/org/erights/e/elib/slot/EverReporter.html EverReporter] pattern/interface
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==Documentation and help==
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* The [[Walnut]]
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* The [http://erights.org/javadoc/index.html ELib api]
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* Documentation on the [http://www.erights.org ERights homepage]. See [[List_of_papers]]
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* The [http://www.eros-os.org/pipermail/e-lang/ E mailing list]. You can search the archives using google by including "site:eros-os.org" in the search field.
==Other things you should know==
==Other things you should know==
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<span style="color:red">Should be in Walnut?!?</span>
* Declaring a Java class as safe for importing: Create a file with the extension .safej and save it to the same class path location as the java class you want to declare as safe. In the .safej file you can declare methods of that class as allowed or rejected. Take a look at the [[Safej_example]]. You can find more .safej files in the E distribution in the folder src/safej.
* Declaring a Java class as safe for importing: Create a file with the extension .safej and save it to the same class path location as the java class you want to declare as safe. In the .safej file you can declare methods of that class as allowed or rejected. Take a look at the [[Safej_example]]. You can find more .safej files in the E distribution in the folder src/safej.

Revision as of 13:16, 29 November 2006

This page contains some helpful tips for people who are planning on learning E.

Where to start

  • You should have basic knowledge of Java and its class path system.
  • Download and install E
  • Read the Walnut - it is the most concise text on the E language and library.
  • Bookmark the ELib api
  • Either download the E source or open the e.jar (for example with unzip) and take a look around
  • You can get informations about E objects by using the help() method. For example, open rune and enter
    ?help([])
    You will get information about the ConstList class and its methods.
  • Take a look at the file org.erights.e.elang.syntax/syntax-props-default.txt. It contains information about various language constructs not explained elsewhere at this point. Here is the version of the file included in E version 0.8.37b.
  • The source also contains a number of emakers that can be used when developing programs. For example:
    • org.erights.e.facet.makeStoneCast.emaker: An implementation of the Facets pattern
    • org.erights.e.facet.makeCaretaker.emaker: An implementation of the [Capabilities] pattern
    • org.erights.e.elib.slot.makeLamportSlot.emaker: An implementation of the EverReporter pattern/interface

Documentation and help

Other things you should know

Should be in Walnut?!?

  • Declaring a Java class as safe for importing: Create a file with the extension .safej and save it to the same class path location as the java class you want to declare as safe. In the .safej file you can declare methods of that class as allowed or rejected. Take a look at the Safej_example. You can find more .safej files in the E distribution in the folder src/safej.
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