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<div id="mw-content-text" lang="en" dir="ltr" class="mw-content-ltr"><div id="toc" class="toc"><div id="toctitle"><h2>Contents</h2></div>
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<li class="toclevel-1 tocsection-1"><a href="ConnectivityMessageInterface.html#Description"><span class="tocnumber">1</span> <span class="toctext">Description</span></a></li>
<li class="toclevel-1 tocsection-2"><a href="ConnectivityMessageInterface.html#Technical_proposal"><span class="tocnumber">2</span> <span class="toctext">Technical proposal</span></a>
<ul>
<li class="toclevel-2 tocsection-3"><a href="ConnectivityMessageInterface.html#Interface"><span class="tocnumber">2.1</span> <span class="toctext">Interface</span></a></li>
<li class="toclevel-2 tocsection-4"><a href="ConnectivityMessageInterface.html#Message_Objects"><span class="tocnumber">2.2</span> <span class="toctext">Message Objects</span></a></li>
<li class="toclevel-2 tocsection-5"><a href="ConnectivityMessageInterface.html#MessageItem_Structure"><span class="tocnumber">2.3</span> <span class="toctext">MessageItem Structure</span></a></li>
<li class="toclevel-2 tocsection-6"><a href="ConnectivityMessageInterface.html#Utilities"><span class="tocnumber">2.4</span> <span class="toctext">Utilities</span></a></li>
<li class="toclevel-2 tocsection-7"><a href="ConnectivityMessageInterface.html#Message_Objects_vs_plain_XML_Messaging"><span class="tocnumber">2.5</span> <span class="toctext">Message Objects vs plain XML Messaging</span></a></li>
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</li>
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</div>
<h2><span class="mw-headline" id="Description">Description</span></h2>
<p>This is an alternative concept for the Connectivity Interface. It does not use a traditional structured API but a message like approach.
Attached is a sample implementation that illustrates the usage: [^ConnectivityInterface.zip].
</p>
<h2><span class="mw-headline" id="Technical_proposal">Technical proposal</span></h2>
<h3><span class="mw-headline" id="Interface">Interface</span></h3>
<p>The interface has only one method that processes the incoming message and creates a response message.
</p>
<div dir="ltr" class="mw-geshi mw-code mw-content-ltr"><div class="java source-java"><pre class="de1"> <span class="kw1">public</span> <span class="kw1">class</span> ConnectivityManager
<span class="br0">&#123;</span>
Message process<span class="br0">&#40;</span>Message msg<span class="br0">&#41;</span> <span class="kw1">throws</span> <span class="kw3">Exception</span>
<span class="br0">&#125;</span></pre></div></div>
<p><br />
</p>
<h3><span class="mw-headline" id="Message_Objects">Message Objects</span></h3>
<p>A Message can be either a REQUEST to Connectivity or a RESPONSE by Connectivity. This is the Type of the message. It also contains and identifier for an Action that is/was performed.
And finaly a message has a MessageItem, the content of the message. Type and Action are Enumerations, that can be extended easily.
</p>
<div dir="ltr" class="mw-geshi mw-code mw-content-ltr"><div class="java source-java"><pre class="de1"><span class="kw1">public</span> <span class="kw1">class</span> Message
<span class="br0">&#123;</span>
Type type<span class="sy0">;</span>
<span class="kw3">Action</span> action<span class="sy0">;</span>
MessageItem item<span class="sy0">;</span>
<span class="br0">&#125;</span>
&#160;
<span class="kw1">public</span> <span class="kw1">enum</span> Type
<span class="br0">&#123;</span>
REQUEST, RESPONSE
<span class="br0">&#125;</span>
&#160;
<span class="kw1">public</span> <span class="kw1">enum</span> <span class="kw3">Action</span>
<span class="br0">&#123;</span>
DI_INIT, DI_CHECK_FOR_UPDATE, DI_FINISH, DI_DELETE, <span class="co1">// delta indexing</span>
ADD, UPDATE, DELETE, <span class="co1">// indexing</span>
CLEAR <span class="co1">// management</span>
<span class="br0">&#125;</span></pre></div></div>
<p><br />
The MessageItem is an abstract base class for concrete MessageItem classes. Each concrete MessageItem has a name and a value. If additional MessageItem classes are needed, they can be
introduced easily just by extending the abstract base class MessageItem. In this way, the content of a message can be assembled in any way. How a message has to be assembeled depends on Type and Action.
</p>
<div dir="ltr" class="mw-geshi mw-code mw-content-ltr"><div class="java source-java"><pre class="de1"><span class="kw1">public</span> <span class="kw1">abstract</span> <span class="kw1">class</span> MessageItem
<span class="br0">&#123;</span>
<span class="kw3">String</span> name<span class="sy0">;</span>
&#160;
<span class="kw1">public</span> MessageItem<span class="br0">&#40;</span><span class="kw3">String</span> name<span class="br0">&#41;</span>
<span class="br0">&#123;</span>
<span class="kw1">this</span>.<span class="me1">name</span> <span class="sy0">=</span> name<span class="sy0">;</span>
<span class="br0">&#125;</span>
<span class="br0">&#125;</span>
&#160;
<span class="kw1">public</span> <span class="kw1">class</span> MessageItemList <span class="kw1">extends</span> MessageItem
<span class="br0">&#123;</span>
MessageItem<span class="br0">&#91;</span><span class="br0">&#93;</span> value<span class="sy0">;</span>
&#160;
MessageItemList<span class="br0">&#40;</span><span class="kw3">String</span> name, <span class="kw4">int</span> size<span class="br0">&#41;</span>
<span class="br0">&#123;</span>
<span class="kw1">super</span><span class="br0">&#40;</span>name<span class="br0">&#41;</span><span class="sy0">;</span>
value <span class="sy0">=</span> <span class="kw1">new</span> MessageItem<span class="br0">&#91;</span>size<span class="br0">&#93;</span><span class="sy0">;</span>
<span class="br0">&#125;</span>
<span class="br0">&#125;</span>
&#160;
<span class="kw1">public</span> <span class="kw1">class</span> RecordItem <span class="kw1">extends</span> MessageItem
<span class="br0">&#123;</span>
Record value<span class="sy0">;</span>
&#160;
<span class="kw1">public</span> RecordItem<span class="br0">&#40;</span><span class="kw3">String</span> name, Record record <span class="br0">&#41;</span>
<span class="br0">&#123;</span>
<span class="kw1">super</span><span class="br0">&#40;</span>name<span class="br0">&#41;</span><span class="sy0">;</span>
value <span class="sy0">=</span> record<span class="sy0">;</span>
<span class="br0">&#125;</span>
<span class="br0">&#125;</span>
&#160;
<span class="kw1">public</span> <span class="kw1">class</span> IDItem <span class="kw1">extends</span> MessageItem
<span class="br0">&#123;</span>
ID value<span class="sy0">;</span>
&#160;
<span class="kw1">public</span> IDItem<span class="br0">&#40;</span><span class="kw3">String</span> name, ID id <span class="br0">&#41;</span>
<span class="br0">&#123;</span>
<span class="kw1">super</span><span class="br0">&#40;</span>name<span class="br0">&#41;</span><span class="sy0">;</span>
value <span class="sy0">=</span> id<span class="sy0">;</span>
<span class="br0">&#125;</span>
&#160;
<span class="br0">&#125;</span>
&#160;
<span class="kw1">public</span> <span class="kw1">class</span> StringItem <span class="kw1">extends</span> MessageItem
<span class="br0">&#123;</span>
<span class="kw3">String</span> value<span class="sy0">;</span>
&#160;
<span class="kw1">public</span> StringItem<span class="br0">&#40;</span><span class="kw3">String</span> name, <span class="kw3">String</span> string <span class="br0">&#41;</span>
<span class="br0">&#123;</span>
<span class="kw1">super</span><span class="br0">&#40;</span>name<span class="br0">&#41;</span><span class="sy0">;</span>
value <span class="sy0">=</span> string<span class="sy0">;</span>
<span class="br0">&#125;</span>
&#160;
<span class="br0">&#125;</span>
&#160;
<span class="kw1">public</span> <span class="kw1">class</span> BooleanItem <span class="kw1">extends</span> MessageItem
<span class="br0">&#123;</span>
<span class="kw4">boolean</span> value<span class="sy0">;</span>
<span class="kw1">public</span> BooleanItem<span class="br0">&#40;</span><span class="kw3">String</span> name, <span class="kw4">boolean</span> bool <span class="br0">&#41;</span>
<span class="br0">&#123;</span>
<span class="kw1">super</span><span class="br0">&#40;</span>name<span class="br0">&#41;</span><span class="sy0">;</span>
value <span class="sy0">=</span> bool<span class="sy0">;</span>
<span class="br0">&#125;</span>
<span class="br0">&#125;</span>
&#160;
<span class="kw1">public</span> <span class="kw1">class</span> IntegerItem <span class="kw1">extends</span> MessageItem
<span class="br0">&#123;</span>
<span class="kw4">int</span> value<span class="sy0">;</span>
<span class="kw1">public</span> IntegerItem<span class="br0">&#40;</span><span class="kw3">String</span> name, <span class="kw4">int</span> integer <span class="br0">&#41;</span>
<span class="br0">&#123;</span>
<span class="kw1">super</span><span class="br0">&#40;</span>name<span class="br0">&#41;</span><span class="sy0">;</span>
value <span class="sy0">=</span> integer<span class="sy0">;</span>
<span class="br0">&#125;</span>
<span class="br0">&#125;</span></pre></div></div>
<p><br />
</p>
<h3><span class="mw-headline" id="MessageItem_Structure">MessageItem Structure</span></h3>
<p>As said before, the structure of a message item depends on the Type and Action. For each combination of Type/Action a MessageItem structure has to be defined.
Here is a table of some simple examples. These are by no means final. If a message needs additional data it can easily be redefined.
The data could also be represented in other ways, for example the REQUEST/DI_CHECK_FOR_UPDATE could also use a MessageItemList&lt;MessageItemList&lt;String, String&gt;&gt;. Or the ADD and UPDATE actiuons could only allow one RecordItem instead of a list of RecordItems
</p>
<table border="1">
<tr>
<td>
</td>
<th> REQUEST
</th>
<th> RESPONSE
</th></tr>
<tr>
<th> DI_INIT
</th>
<td> StringItem
</td>
<td> BooleanItem
</td></tr>
<tr>
<th> DI_CHECK_FOR_UPDATE
</th>
<td> MessageItemList&lt;RecordItem&gt;
</td>
<td> MessageItemList&lt;BooleanItem&gt;
</td></tr>
<tr>
<th> DI_FINISH
</th>
<td> StringItem
</td>
<td> BooleanItem
</td></tr>
<tr>
<th> DI_DELETE
</th>
<td> StringItem
</td>
<td> IntegerItem
</td></tr>
<tr>
<th> ADD
</th>
<td> MessageItemList&lt;RecordItem&gt;
</td>
<td> IntegerItem
</td></tr>
<tr>
<th> UPDATE
</th>
<td> MessageItemList&lt;RecordItem&gt;
</td>
<td> IntegerItem
</td></tr>
<tr>
<th> DELETE
</th>
<td> MessageItemList&lt;IDTem&gt;
</td>
<td> MessageItemList&lt;IntegerItem&gt;
</td></tr>
<tr>
<th> CLEAR
</th>
<td> StringItem
</td>
<td> BooleanItem
</td></tr></table>
<p>The same applies to names for MessageItems. In some cases there may be no need for explicit names, in other cases the might be helpful to distinguish between different information.
Here are two examples for complete Message objects used during delta indexing check for update. The Request contains a list of EILFRecords with delta indexing information (ID and hash). The Response contains a list of boolean.
The index of both lists match, so that the result for a record at request\[x\] can be found at response\[x\]. The examples are represented in XML syntax for better readability. Note that the XML representation of the EILFRecord is just a sample.
</p>
<div dir="ltr" class="mw-geshi mw-code mw-content-ltr"><div class="xml source-xml"><pre class="de1"><span class="sc3"><span class="re1">&lt;?xml</span> <span class="re0">version</span>=<span class="st0">&quot;1.0&quot;</span> <span class="re0">encoding</span>=<span class="st0">&quot;UTF-8&quot;</span><span class="re2">?&gt;</span></span>
<span class="sc3"><span class="re1">&lt;Message</span> <span class="re0">xmlns:xsi</span>=<span class="st0">&quot;http://www.w3.org/2001/XMLSchema-instance&quot;</span> <span class="re0">xsi:noNamespaceSchemaLocation</span>=<span class="st0">&quot;Message.xsd&quot;</span><span class="re2">&gt;</span></span>
<span class="sc3"><span class="re1">&lt;Message<span class="re2">&gt;</span></span></span>
<span class="sc3"><span class="re1">&lt;Type<span class="re2">&gt;</span></span></span>REQUEST<span class="sc3"><span class="re1">&lt;/Type<span class="re2">&gt;</span></span></span>
<span class="sc3"><span class="re1">&lt;Action<span class="re2">&gt;</span></span></span>CHECK_FOR_UPDATE<span class="sc3"><span class="re1">&lt;/Action<span class="re2">&gt;</span></span></span>
<span class="sc3"><span class="re1">&lt;MessageItemList</span> <span class="re0">name</span>=<span class="st0">&quot;recordCheckList&quot;</span><span class="re2">&gt;</span></span>
<span class="sc3"><span class="re1">&lt;RecordItem</span> <span class="re0">name</span>=<span class="st0">&quot;1&quot;</span><span class="re2">&gt;</span></span>
<span class="sc3"><span class="re1">&lt;EILFRecord<span class="re2">&gt;</span></span></span>
<span class="sc3"><span class="re1">&lt;ID<span class="re2">&gt;</span></span></span>1<span class="sc3"><span class="re1">&lt;/ID<span class="re2">&gt;</span></span></span>
<span class="sc3"><span class="re1">&lt;Hash<span class="re2">&gt;</span></span></span>aaa<span class="sc3"><span class="re1">&lt;/Hash<span class="re2">&gt;</span></span></span>
<span class="sc3"><span class="re1">&lt;/EILFRecord<span class="re2">&gt;</span></span></span>
<span class="sc3"><span class="re1">&lt;/RecordItem<span class="re2">&gt;</span></span></span>
<span class="sc3"><span class="re1">&lt;RecordItem</span> <span class="re0">name</span>=<span class="st0">&quot;2&quot;</span><span class="re2">&gt;</span></span>
<span class="sc3"><span class="re1">&lt;EILFRecord<span class="re2">&gt;</span></span></span>
<span class="sc3"><span class="re1">&lt;ID<span class="re2">&gt;</span></span></span>2<span class="sc3"><span class="re1">&lt;/ID<span class="re2">&gt;</span></span></span>
<span class="sc3"><span class="re1">&lt;Hash<span class="re2">&gt;</span></span></span>bbb<span class="sc3"><span class="re1">&lt;/Hash<span class="re2">&gt;</span></span></span>
<span class="sc3"><span class="re1">&lt;/EILFRecord<span class="re2">&gt;</span></span></span>
<span class="sc3"><span class="re1">&lt;/RecordItem<span class="re2">&gt;</span></span></span>
<span class="sc3"><span class="re1">&lt;RecordItem</span> <span class="re0">name</span>=<span class="st0">&quot;3&quot;</span><span class="re2">&gt;</span></span>
<span class="sc3"><span class="re1">&lt;EILFRecord<span class="re2">&gt;</span></span></span>
<span class="sc3"><span class="re1">&lt;ID<span class="re2">&gt;</span></span></span>3<span class="sc3"><span class="re1">&lt;/ID<span class="re2">&gt;</span></span></span>
<span class="sc3"><span class="re1">&lt;Hash<span class="re2">&gt;</span></span></span>ccc<span class="sc3"><span class="re1">&lt;/Hash<span class="re2">&gt;</span></span></span>
<span class="sc3"><span class="re1">&lt;/EILFRecord<span class="re2">&gt;</span></span></span>
<span class="sc3"><span class="re1">&lt;/RecordItem<span class="re2">&gt;</span></span></span>
<span class="sc3"><span class="re1">&lt;/MessageItemList<span class="re2">&gt;</span></span></span>
<span class="sc3"><span class="re1">&lt;/Message<span class="re2">&gt;</span></span></span></pre></div></div>
<div dir="ltr" class="mw-geshi mw-code mw-content-ltr"><div class="xml source-xml"><pre class="de1"><span class="sc3"><span class="re1">&lt;?xml</span> <span class="re0">version</span>=<span class="st0">&quot;1.0&quot;</span> <span class="re0">encoding</span>=<span class="st0">&quot;UTF-8&quot;</span><span class="re2">?&gt;</span></span>
<span class="sc3"><span class="re1">&lt;Message</span> <span class="re0">xmlns:xsi</span>=<span class="st0">&quot;http://www.w3.org/2001/XMLSchema-instance&quot;</span> <span class="re0">xsi:noNamespaceSchemaLocation</span>=<span class="st0">&quot;Message.xsd&quot;</span><span class="re2">&gt;</span></span>
<span class="sc3"><span class="re1">&lt;Type<span class="re2">&gt;</span></span></span>RESPONSE<span class="sc3"><span class="re1">&lt;/Type<span class="re2">&gt;</span></span></span>
<span class="sc3"><span class="re1">&lt;Action<span class="re2">&gt;</span></span></span>CHECK_FOR_UPDATE<span class="sc3"><span class="re1">&lt;/Action<span class="re2">&gt;</span></span></span>
<span class="sc3"><span class="re1">&lt;MessageItemList</span> <span class="re0">name</span>=<span class="st0">&quot;recordFeedbackList&quot;</span><span class="re2">&gt;</span></span>
<span class="sc3"><span class="re1">&lt;BooleanItem</span> <span class="re0">name</span>=<span class="st0">&quot;1&quot;</span><span class="re2">&gt;</span></span>true<span class="sc3"><span class="re1">&lt;/BooleanItem<span class="re2">&gt;</span></span></span>
<span class="sc3"><span class="re1">&lt;BooleanItem</span> <span class="re0">name</span>=<span class="st0">&quot;2&quot;</span><span class="re2">&gt;</span></span>true<span class="sc3"><span class="re1">&lt;/BooleanItem<span class="re2">&gt;</span></span></span>
<span class="sc3"><span class="re1">&lt;BooleanItem</span> <span class="re0">name</span>=<span class="st0">&quot;3&quot;</span><span class="re2">&gt;</span></span>false<span class="sc3"><span class="re1">&lt;/BooleanItem<span class="re2">&gt;</span></span></span>
<span class="sc3"><span class="re1">&lt;/MessageItemList<span class="re2">&gt;</span></span></span>
<span class="sc3"><span class="re1">&lt;/Message<span class="re2">&gt;</span></span></span></pre></div></div>
<p><br />
</p>
<h3><span class="mw-headline" id="Utilities">Utilities</span></h3>
<p>To make the usage of the MessageItems easier for developers we could also provide Factory classes for creation of certain messages.
</p>
<div dir="ltr" class="mw-geshi mw-code mw-content-ltr"><div class="java source-java"><pre class="de1"><span class="kw1">public</span> <span class="kw1">interface</span> MessageFactory
<span class="br0">&#123;</span>
<span class="kw1">static</span> Message createAddRequest<span class="br0">&#40;</span>EILFRecord<span class="br0">&#91;</span><span class="br0">&#93;</span> records<span class="br0">&#41;</span>
&#160;
<span class="kw1">static</span> Message createAddResponse<span class="br0">&#40;</span><span class="kw4">int</span> count<span class="br0">&#41;</span>
&#160;
<span class="kw1">static</span> Message createCheckForUpdateRequest<span class="br0">&#40;</span>EILFRecord<span class="br0">&#91;</span><span class="br0">&#93;</span> records<span class="br0">&#41;</span><span class="sy0">;</span>
&#160;
<span class="kw1">static</span> Message createCheckForUpdateResponse<span class="br0">&#40;</span><span class="kw4">boolean</span><span class="br0">&#91;</span><span class="br0">&#93;</span> values<span class="br0">&#41;</span><span class="sy0">;</span>
&#160;
...
<span class="br0">&#125;</span></pre></div></div>
<p><br />
</p>
<h3><span class="mw-headline" id="Message_Objects_vs_plain_XML_Messaging">Message Objects vs plain XML Messaging</span></h3>
<p>The idea of the Message Objects was to provide a Java API in the first place. By using SCA it is easily possible to also use the interface remote, either via RMI or Webservice interface.
However, there are some issues regarding component upgrades. Imagine a setup where components are hosted by different departments and each department has it's own update cycle. This will certainly lead to different software versions of components.
So an updated IRM could use a newer Version of the Message Objects (e.g. with additional Actions) than the called ConnectivityModule.
</p>
<ul>
<li> plain XML
</li>
</ul>
<p>With a plain XML message concept, using a version flag, it's possible to decide during parsing if Connectivity is capable of processing a given message and a message could be declined (e.g. sending a response or throwing an exception). It's possible to allow downwards compatibility to certain versions.
</p>
<ul>
<li> RMI
</li>
</ul>
<p>Objects exchanged over RMI need to be serializable. This implies the usage of a serialVersionUID, by which the JVM can check if a serialized data fits to the current available .class file. If not, a InvalidClassException is thrown. The serialVersionUID usualy changes on any modifications. However, it is also possible to assign the serialVersionUID manually. In this way the serialVersionUID could be maintained on non conflicting changes (e.g. changes that do not affect the serialized data). It's not possible to be downwards compatible, as it is only checked if the serialVersionUID is equal. Adding a new value to an Enum may be seen as a non conflicting change - it is NOT. During de-serialization the JVM throws a java.lang.IllegalArgumentException. So in case of Message Objects the serialVersionUID needs also to be changed if any of the used Enums changes.
</p>
<ul>
<li> Webservice
</li>
</ul>
<p>The Tuscany generated Webservice interface doesn't care about the serialVersionUID used in serializable classes. Here we would have to use an own version flag. It is also a little more flexible concerning Enums, as if it does not know about a value it initializes the variable with null (no Exception). It's possible to allow downwards compatibility to certain versions.
</p><p>The biggest problem is that RMI and Webservices behave differently and the client has to be prepared to handle any exceptions, as the binding is configurable. Also, there may be many dependencies in the serializable Message Objects and deciding if modifications need to change the serialVersionUID may not be obvious.
</p>
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