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Posted to commits@directory.apache.org by el...@apache.org on 2018/01/12 13:58:33 UTC
svn commit: r1820987 - in /directory/site/trunk/content/api/dev-guide: ./
images/
Author: elecharny
Date: Fri Jan 12 13:58:33 2018
New Revision: 1820987
URL: http://svn.apache.org/viewvc?rev=1820987&view=rev
Log:
Added more pages
Added:
directory/site/trunk/content/api/dev-guide/3-building.mdtext.mdtext
directory/site/trunk/content/api/dev-guide/4-asn1.mdtext
directory/site/trunk/content/api/dev-guide/images/asn1-codec.graphml
directory/site/trunk/content/api/dev-guide/images/asn1-codec.png (with props)
directory/site/trunk/content/api/dev-guide/images/sm-transition.graphml
directory/site/trunk/content/api/dev-guide/images/sm-transition.png (with props)
Modified:
directory/site/trunk/content/api/dev-guide/1-introduction.mdtext
directory/site/trunk/content/api/dev-guide/2-general-structure.mdtext
Modified: directory/site/trunk/content/api/dev-guide/1-introduction.mdtext
URL: http://svn.apache.org/viewvc/directory/site/trunk/content/api/dev-guide/1-introduction.mdtext?rev=1820987&r1=1820986&r2=1820987&view=diff
==============================================================================
--- directory/site/trunk/content/api/dev-guide/1-introduction.mdtext (original)
+++ directory/site/trunk/content/api/dev-guide/1-introduction.mdtext Fri Jan 12 13:58:33 2018
@@ -22,7 +22,7 @@ Notice: Licensed to the Apache Software
# 1 - Introduction
-This Developer Guide teaches developers about the inner logic of the API. It can be useful to those interested in the project, giving them some clues about how it all works and its design, and also to those who want to extend the **LDAP API* by adding _Controls_, _Extended Operations_, or schema elements like _SyntaxCheckers_, _Comparators_, etc.
+This Developer Guide teaches developers about the inner logic of the **LDAP API**. It can be useful to those interested in the project, giving them some clues about how it all works and its design, and also to those who want to extend the **LDAP API** by adding _Controls_, _Extended Operations_, or schema elements like _SyntaxCheckers_, _Comparators_, etc.
## Content
Modified: directory/site/trunk/content/api/dev-guide/2-general-structure.mdtext
URL: http://svn.apache.org/viewvc/directory/site/trunk/content/api/dev-guide/2-general-structure.mdtext?rev=1820987&r1=1820986&r2=1820987&view=diff
==============================================================================
--- directory/site/trunk/content/api/dev-guide/2-general-structure.mdtext (original)
+++ directory/site/trunk/content/api/dev-guide/2-general-structure.mdtext Fri Jan 12 13:58:33 2018
@@ -94,7 +94,7 @@ LDAP API root
+-- util
</pre>
-* The *all* module is just a packaging module, gathering all the other modules in one single jar to simplify the work o those who want to use the API. One can import each module speparately, or the *all* module only. Note that it does not include the tests and integration modules (**integ**, **integ-osgi** and **distribution**)
+* The **all** module is just a packaging module, gathering all the other modules in one single jar to simplify the work for those who want to use the API. One can import each module speparately, or the **all** module only. Note that it does not include the tests and integration modules (**integ**, **integ-osgi** and **distribution**)
* The **asn1** module contains the code needed to handle *ASN/1* encoding/decoding.
Added: directory/site/trunk/content/api/dev-guide/3-building.mdtext.mdtext
URL: http://svn.apache.org/viewvc/directory/site/trunk/content/api/dev-guide/3-building.mdtext.mdtext?rev=1820987&view=auto
==============================================================================
--- directory/site/trunk/content/api/dev-guide/3-building.mdtext.mdtext (added)
+++ directory/site/trunk/content/api/dev-guide/3-building.mdtext.mdtext Fri Jan 12 13:58:33 2018
@@ -0,0 +1,60 @@
+Title: 3 - Building
+NavPrev: 2-general-structure.html
+NavPrevText: 2 - General Structure
+NavUp: ../dev-guide.html
+NavUpText: Developer Guide
+NavNext: 4-asn1.html
+NavNextText: 4 - ASN/1
+Notice: Licensed to the Apache Software Foundation (ASF) under one
+ or more contributor license agreements. See the NOTICE file
+ distributed with this work for additional information
+ regarding copyright ownership. The ASF licenses this file
+ to you under the Apache License, Version 2.0 (the
+ "License"); you may not use this file except in compliance
+ with the License. You may obtain a copy of the License at
+ .
+ http://www.apache.org/licenses/LICENSE-2.0
+ .
+ Unless required by applicable law or agreed to in writing,
+ software distributed under the License is distributed on an
+ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ KIND, either express or implied. See the License for the
+ specific language governing permissions and limitations
+ under the License.
+
+# 3 - Building
+
+The project is based on **Apache Maven** (version 3.x), so you'll have to install it first.
+
+That being said, building the **LDAP API** is pretty straightforward :
+
+ :::
+ $ mvn clean install
+ Java HotSpot(TM) 64-Bit Server VM warning: ignoring option MaxPermSize=256M; support was removed in 8.0
+ [INFO] Scanning for projects...
+ [INFO] ------------------------------------------------------------------------
+ [INFO] Reactor Build Order:
+ [INFO]
+ [INFO] Apache Directory LDAP API
+ [INFO] Apache Directory LDAP API I18n
+ [INFO] Apache Directory LDAP API Utilities
+ ...
+ [INFO] Apache Directory LDAP API Model
+ [INFO] Apache Directory LDAP API Codec Parent
+ [INFO] Apache Directory API Integration Tests
+ [INFO] Apache Directory API OSGi Integration Tests
+ [INFO] Apache Directory LDAP API Distribution
+ [INFO]
+ [INFO] ------------------------------------------------------------------------
+ [INFO] Building Apache Directory LDAP API 2.0.0.AM1-SNAPSHOT
+ [INFO] ------------------------------------------------------------------------
+ ...
+
+
+It takes around 1 min to build it all (a bit longer the first time, as some dependencies wil have to be pulled from the net).
+
+
+The top level _pom.xml_ depends on teh special _project_ 'project', which is used by all the **ApacheDS** projects. It gathers information about maven plugin dependenies and someother things. You don't really need to touch it anyway...
+
+Remember to use **Java 8** !!
+
Added: directory/site/trunk/content/api/dev-guide/4-asn1.mdtext
URL: http://svn.apache.org/viewvc/directory/site/trunk/content/api/dev-guide/4-asn1.mdtext?rev=1820987&view=auto
==============================================================================
--- directory/site/trunk/content/api/dev-guide/4-asn1.mdtext (added)
+++ directory/site/trunk/content/api/dev-guide/4-asn1.mdtext Fri Jan 12 13:58:33 2018
@@ -0,0 +1,110 @@
+Title: 4 - ASN/1
+NavPrev: 3-building.html
+NavPrevText: 3 - Building
+NavUp: ../dev-guide.html
+NavUpText: Developer Guide
+NavNext: 5-network.html
+NavNextText: 5 - Network
+Notice: Licensed to the Apache Software Foundation (ASF) under one
+ or more contributor license agreements. See the NOTICE file
+ distributed with this work for additional information
+ regarding copyright ownership. The ASF licenses this file
+ to you under the Apache License, Version 2.0 (the
+ "License"); you may not use this file except in compliance
+ with the License. You may obtain a copy of the License at
+ .
+ http://www.apache.org/licenses/LICENSE-2.0
+ .
+ Unless required by applicable law or agreed to in writing,
+ software distributed under the License is distributed on an
+ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ KIND, either express or implied. See the License for the
+ specific language governing permissions and limitations
+ under the License.
+
+# 4 - ASN/1
+
+To be completed...
+
+
+The **LDAP** protocol is based on an **ASN/1** description. We will notexplain in detail what is **ASN/1** about, you would rather check [This page](https://en.wikipedia.org/wiki/Abstract_Syntax_Notation_One) for a very limited introduction, or if you feel teh need to understand what is **ASN/1** in detail, just read the [Olivier Dubuisson's book on ASN.1](http://www.oss.com/asn1/resources/books-whitepapers-pubs/dubuisson-asn1-book.PDF) (This is probably the best reference !)
+
+Anyway, we use a subset of **ASN/1**, as what we have to deal with is the **BER/DER** encoding. (**BER** or **DER** stands for **B**asic **E**ncoding **R**ule and **D**istinguished **E**ncoding **R**ule. There are other possible encoding, like **PER**, **XER**, **CER**, but they are irrelevant for **LDAP**)
+
+What is needed to know is that **ASN/1** is just a notation used to describe the messages being exchanged between a client and a server, and in order to use it, we need an encoder and a decoder on both sides :
+
+
+
+## ASN/1 implementation in Apache LDAP API
+
+It took a long time to get it right ! And it's not perfect :-)
+
+The very first iteration was using a proprietary library (**IBM SNACC**), but that was before **ApacheDS** became a **TLP** ! The next iteration was based on a rewriting system, which was pretty slow. Then came **Snicker**, a _State Machine_ based decoder, which is currently what we use. We might change for a faster implementation, like what **Kerby** is using...
+
+### ASN/1 messages
+
+Let's start with the basic information.
+
+An encoded ASN/1 message is a tuple contianing two or three elements : a **T**ype, a **L**ength and optionally - ie if the length is not 0 - a **V**alue. This tuple is called a **TLV**. Every message is a **TLV**.
+
+But a message can be have complex structure, so a **TLV** itself can encapsulate some **TLV**s. Actually the **V** part can be a list of **TLV**s. This is recursive...
+
+A typical encoded message can therefore represented this way :
+
+ :::
+ [TL [TLV] [TL [TLV] [TLV]]]
+
+Here, the message **TLV** value is a set of two **TLV**s, teh second one being itself a composition of 2 **TLV**s.
+
+The **T** describe the type of value, the **L** gives the length of this value (can be 0) and of course the **V** is the value, which can itself be a **TLV**.
+
+### Encoder/Decoder
+
+There are two aspects we have to deal with :
+
+* encoding messages
+* decoding messages
+
+Those are two different things, and we don't use the same mechanism. **Encoding** is done using a _State Machine_, and **Decoding** which is hard wired in each class implementing a message.
+
+As we said, it's not perfect, first because it's complex to implement, complex to add a new message, and complex to test. We don't have a compiler that generates the stubs to encode or decode messages.
+
+### Decoder
+
+The _Decoder_ work is to take a **byte[]** and transform it into an instance of a jave object. When we receive the **byte[]**, we don't know yet what kind of message we are dealing with, so the creation of the instance is differed.
+
+We have built a generic decoder that takes some imputs and produces the result, based on those elements :
+
+* A _Grammar_
+* A _Container_
+* A _StateEnum_
+* A _Decorator_
+* and optionally a _Factory_
+
+The _Grammar_ describes the transitions and actions of the state machine used to decode a message. Note that the actions can be stored in separate classes.
+
+The _Container_ is a wrapper around a message that is fed by the State Machine and that will contain the Java instance once fully decoded. It's initally empty.
+
+The _StateEnum_ is a Java enumeration listing all the possible _Grammar_ states.
+
+The _Decorator_ is a wrapper used to store a decoded message.
+
+The _Factory_ is used to create the message instance (it's optional)
+
+And of course, you have the messsage class that will be created and stored in the _Decorator_
+
+So what we have is based on a **State Engine**, which means you have to describe
+
+
+### Encoder
+
+It's slightly simpler : we use the *Decorator* to implement the encoding of a message. Two methods are necessary :
+
+* _int computeLength()_ : compute the _ByteBuffer_ size necessary to stored the encoded message
+* _ByteBuffer encode( ByteBuffer )_ : actually encode the message into a _ByteBuffer_
+
+### The state machine
+
+So we decode a message using a state machine, which basically transit from one state to another, and optionally execute an action in between :
+
+
Added: directory/site/trunk/content/api/dev-guide/images/asn1-codec.graphml
URL: http://svn.apache.org/viewvc/directory/site/trunk/content/api/dev-guide/images/asn1-codec.graphml?rev=1820987&view=auto
==============================================================================
--- directory/site/trunk/content/api/dev-guide/images/asn1-codec.graphml (added)
+++ directory/site/trunk/content/api/dev-guide/images/asn1-codec.graphml Fri Jan 12 13:58:33 2018
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URL: http://svn.apache.org/viewvc/directory/site/trunk/content/api/dev-guide/images/sm-transition.png?rev=1820987&view=auto
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Propchange: directory/site/trunk/content/api/dev-guide/images/sm-transition.png
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svn:mime-type = application/octet-stream