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| <div id="toc" class="toc"><div id="toctitle"><h2>Contents</h2></div> |
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| <li class="toclevel-1 tocsection-1"><a href="Binary_Storage.html#Overview"><span class="tocnumber">1</span> <span class="toctext">Overview</span></a></li> |
| <li class="toclevel-1 tocsection-2"><a href="Binary_Storage.html#Configuration"><span class="tocnumber">2</span> <span class="toctext">Configuration</span></a></li> |
| <li class="toclevel-1 tocsection-3"><a href="Binary_Storage.html#Configuration_example"><span class="tocnumber">3</span> <span class="toctext">Configuration example</span></a></li> |
| <li class="toclevel-1 tocsection-4"><a href="Binary_Storage.html#API"><span class="tocnumber">4</span> <span class="toctext">API</span></a></li> |
| <li class="toclevel-1 tocsection-5"><a href="Binary_Storage.html#API_Usage"><span class="tocnumber">5</span> <span class="toctext">API Usage</span></a></li> |
| <li class="toclevel-1 tocsection-6"><a href="Binary_Storage.html#Implementations"><span class="tocnumber">6</span> <span class="toctext">Implementations</span></a> |
| <ul> |
| <li class="toclevel-2 tocsection-7"><a href="Binary_Storage.html#eclipse.smila.binarystorage.persistence.io"><span class="tocnumber">6.1</span> <span class="toctext">eclipse.smila.binarystorage.persistence.io</span></a> |
| <ul> |
| <li class="toclevel-3 tocsection-8"><a href="Binary_Storage.html#IOHierarchicalManager"><span class="tocnumber">6.1.1</span> <span class="toctext">IOHierarchicalManager</span></a></li> |
| <li class="toclevel-3 tocsection-9"><a href="Binary_Storage.html#IOFlatManager"><span class="tocnumber">6.1.2</span> <span class="toctext">IOFlatManager</span></a></li> |
| </ul> |
| </li> |
| <li class="toclevel-2 tocsection-10"><a href="Binary_Storage.html#eclipse.smila.binarystorage.persistence.efs"><span class="tocnumber">6.2</span> <span class="toctext">eclipse.smila.binarystorage.persistence.efs</span></a></li> |
| <li class="toclevel-2 tocsection-11"><a href="Binary_Storage.html#eclipse.smila.binarystorage.persistence.jpa"><span class="tocnumber">6.3</span> <span class="toctext">eclipse.smila.binarystorage.persistence.jpa</span></a></li> |
| </ul> |
| </li> |
| </ul> |
| </div> |
| |
| <h2><span class="mw-headline" id="Overview">Overview</span></h2> |
| <p>Binary Storage Service provides an easy way to store / access binary data documents. |
| </p><p>Client components access the Binary Storage Service for persisting binary data (attachments) into the binary storage. The binary data are identified by a unique key / identifier as a String data type. |
| </p> |
| <h2><span class="mw-headline" id="Configuration">Configuration</span></h2> |
| <p>Currently, Binary Storage is able to run and store data into a hierarchical structure (uses deterministically calculation based on the hash id passed by the client component, like the ID passed from the Blackboard Service) and flat structure. |
| </p><p>To configure the needed persistence storage structure, simply edit the /configuration/org.eclipse.smila.binarystorage/BinaryStorageConfiguration.xml file and change the value of <tt>implementationClass</tt> attribute to the one of the following available possibilities: |
| </p> |
| <ul> |
| <li> org.eclipse.smila.binarystorage.internal.impl.persistence.filesystem.IOHierarchicalManager |
| </li> |
| <li> org.eclipse.smila.binarystorage.internal.impl.persistence.filesystem.IOFlatManager |
| </li> |
| </ul> |
| <p>In the next future there will be other available managers that provides the appropriate implementation for Binary Storage persistence structure. |
| </p><p>The Binary Storage Configuration will be changed soon. |
| </p> |
| <h2><span class="mw-headline" id="Configuration_example">Configuration example</span></h2> |
| <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"><BinaryStorageConfiguration</span> <span class="re0">xmlns</span>=<span class="st0">"http://www.eclipse.org/smila/binarystorage"</span> </span> |
| <span class="sc3"> <span class="re0">xmlns:xsi</span>=<span class="st0">"http://www.w3.org/2001/XMLSchema-instance"</span></span> |
| <span class="sc3"> <span class="re0">xsi:noNamespaceSchemaLocation</span>=<span class="st0">"schemas/BinaryStorageConfiguration.xsd"</span></span> |
| <span class="sc3"> <span class="re0">name</span>=<span class="st0">"default1"</span></span> |
| <span class="sc3"> <span class="re0">provider</span>=<span class="st0">"file"</span></span> |
| <span class="sc3"> <span class="re0">mountPoint</span>=<span class="st0">"default"</span></span> |
| <span class="sc3"> <span class="re0">implementationClass</span>=<span class="st0">"org.eclipse.smila.binarystorage.internal.impl.persistence.filesystem.IOHierarchicalManager"</span> </span> |
| <span class="sc3"> <span class="re0">tempFileName</span>=<span class="st0">"dummy.dat"</span></span> |
| <span class="sc3"> <span class="re0">pathDepth</span>=<span class="st0">"2"</span></span> |
| <span class="sc3"><span class="re2">/></span></span></pre></div></div> |
| <p>Attributes explained: |
| </p> |
| <ul> |
| <li> <tt>name</tt> - configuration alias |
| </li> |
| <li> <tt>implementationClass</tt> - binary storage implementation manager class |
| </li> |
| <li> <tt>tempFileName</tt> - binary storage temporary file name |
| </li> |
| <li> <tt>pathDepth</tt> - the depth of the folder structure (Note: If not set the default value is 2.) |
| </li> |
| <li> <tt>path</tt> - you can optionally add a root folder to store the attachements at the given path. |
| </li> |
| </ul> |
| <h2><span class="mw-headline" id="API">API</span></h2> |
| <div dir="ltr" class="mw-geshi mw-code mw-content-ltr"><div class="java source-java"><pre class="de1"><span class="kw4">void</span> store<span class="br0">(</span><span class="kw3">String</span> id, <span class="kw3">InputStream</span> stream<span class="br0">)</span><span class="sy0">;</span> |
| <span class="kw4">void</span> store<span class="br0">(</span><span class="kw3">String</span> id, <span class="kw4">byte</span><span class="br0">[</span><span class="br0">]</span> blob<span class="br0">)</span> |
| <span class="kw4">byte</span><span class="br0">[</span><span class="br0">]</span> fetchAsByte<span class="br0">(</span><span class="kw3">String</span> id<span class="br0">)</span> |
| <span class="kw3">InputStream</span> fetchAsStream<span class="br0">(</span><span class="kw3">String</span> id<span class="br0">)</span> |
| <span class="kw4">void</span> remove<span class="br0">(</span><span class="kw3">String</span> id<span class="br0">)</span> |
| <span class="kw4">int</span> fetchSize<span class="br0">(</span><span class="kw3">String</span> id<span class="br0">)</span></pre></div></div> |
| <h2><span class="mw-headline" id="API_Usage">API Usage</span></h2> |
| <div dir="ltr" class="mw-geshi mw-code mw-content-ltr"><div class="java source-java"><pre class="de1">BinaryStorageService binaryStorageService <span class="sy0">=</span> ...<span class="sy0">;</span> <span class="co1">// Obtain the binary storage service</span> |
| <span class="kw3">String</span> attacmentIdKey <span class="sy0">=</span> ...<span class="sy0">;</span> <span class="co1">// Unique ID</span> |
| <span class="kw4">byte</span><span class="br0">[</span><span class="br0">]</span> dataRecord <span class="sy0">=</span> ... <span class="co1">// Build record</span> |
|   |
| <span class="co1">// Store the binary record as byte array</span> |
| binaryStorageService.<span class="me1">store</span><span class="br0">(</span>attacmentIdKey, dataRecord<span class="br0">)</span><span class="sy0">;</span> |
|   |
| <span class="co1">// Fetch record as stream</span> |
| <span class="kw1">final</span> <span class="kw3">InputStream</span> stream <span class="sy0">=</span> binaryStorageService.<span class="me1">fetchAsStream</span><span class="br0">(</span>attacmentIdKey<span class="br0">)</span><span class="sy0">;</span> |
|   |
| <span class="co1">// Define new ID and store new data from the first record's input stream</span> |
| <span class="kw1">final</span> <span class="kw3">String</span> newAttacmentIdKey <span class="sy0">=</span> attacmentIdKey <span class="sy0">+</span> <span class="st0">"0000"</span><span class="sy0">;</span> |
| binaryStorageService.<span class="me1">store</span><span class="br0">(</span>newAttacmentIdKey, stream<span class="br0">)</span><span class="sy0">;</span> |
| stream.<span class="me1">close</span><span class="br0">(</span><span class="br0">)</span><span class="sy0">;</span> |
|   |
| <span class="co1">// Fetch the newest record as array of byte </span> |
| <span class="kw1">final</span> <span class="kw4">byte</span><span class="br0">[</span><span class="br0">]</span> recordByte <span class="sy0">=</span> binaryStorageService.<span class="me1">fetchAsByte</span><span class="br0">(</span>newAttacmentIdKey<span class="br0">)</span><span class="sy0">;</span> |
|   |
| <span class="co1">// The two records must have the same size</span> |
| <span class="kw1">final</span> <span class="kw4">int</span> sizeInitial <span class="sy0">=</span> _binaryStorageService.<span class="me1">fetchSize</span><span class="br0">(</span>attacmentIdKey<span class="br0">)</span><span class="sy0">;</span> |
| <span class="kw1">final</span> <span class="kw4">int</span> sizeFinal <span class="sy0">=</span> binaryStorageService.<span class="me1">fetchSize</span><span class="br0">(</span>newAttacmentIdKey<span class="br0">)</span><span class="sy0">;</span> |
|   |
| <span class="co1">// Remove the two records</span> |
| binaryStorageService.<span class="me1">remove</span><span class="br0">(</span>attacmentIdKey<span class="br0">)</span><span class="sy0">;</span> |
| binaryStorageService.<span class="me1">remove</span><span class="br0">(</span>newAttacmentIdKey<span class="br0">)</span><span class="sy0">;</span></pre></div></div> |
| <h2><span class="mw-headline" id="Implementations">Implementations</span></h2> |
| <h3><span class="mw-headline" id="eclipse.smila.binarystorage.persistence.io">eclipse.smila.binarystorage.persistence.io</span></h3> |
| <p>Both I/O implementations use the id in the path name of the persisted file. As a consequence |
| </p> |
| <ul> |
| <li> the characters <tt>[;/\:]</tt> are not allowed in the id |
| </li> |
| <li> too long ids will exceed the platform specific supported max. path length. this will result in a not so obvious error message, that saving failed. |
| </li> |
| </ul> |
| <p>ATM neither limitation this is a problem because the id is a hash made from letters and numbers. |
| </p> |
| <h4><span class="mw-headline" id="IOHierarchicalManager">IOHierarchicalManager</span></h4> |
| <p>The calculation of the path is simply to split the first part of the id into substrings of length 2 and make thees parent folders having the name of the id. |
| </p><p>Care must be taken that the folder depth is not too high, because this results in a <em>lot</em> of folders quenching the performance of the file system. |
| </p> |
| <h4><span class="mw-headline" id="IOFlatManager">IOFlatManager</span></h4> |
| <p>If u only have a few files or ur underlying file system is very good inhandling lots of files per folder then go with this manager. |
| </p><p><br /> |
| </p> |
| <h3><span class="mw-headline" id="eclipse.smila.binarystorage.persistence.efs">eclipse.smila.binarystorage.persistence.efs</span></h3> |
| <p>This implementation is based on EFS. |
| </p><p><br /> |
| </p> |
| <h3><span class="mw-headline" id="eclipse.smila.binarystorage.persistence.jpa">eclipse.smila.binarystorage.persistence.jpa</span></h3> |
| <p>This implementation uses eclipseLink JPA to store the binary objects in a database table named <tt>BINARY_OBJECTS</tt>. |
| </p><p>The default configuration is using Apache Derby and the DB name is <tt>BinaryStorage</tt>. |
| </p> |
| <table class="wikitable" border="1" style="text-align:left"> |
| <caption> BINARY_OBJECTS |
| </caption> |
| <tr> |
| <th> Column |
| </th> |
| <th> Type |
| </th> |
| <th> Description |
| </th></tr> |
| <tr> |
| <th> ID |
| </th> |
| <td> VARCHAR |
| </td> |
| <td> the Id of the binary object |
| </td></tr> |
| <tr> |
| <th> BIN_OBJECT |
| </th> |
| <td> BLOB |
| </td> |
| <td> the binary object |
| </td></tr> |
| </table> |
| <p><br /> |
| </p><p>In order to use this implementation you have to |
| </p> |
| <ul> |
| <li> set parameter <tt>implementationClass</tt> in file <tt>org.eclipse.smila.binarystorage.impl/BinaryStorageConfiguration.xml</tt> to <tt>org.eclipse.smila.binarystorage.persistence.jpa.JPABinaryPersistence</tt> |
| </li> |
| <li> make sure that the bundle <tt>eclipse.smila.binarystorage.persistence.jpa</tt> starts in your launch configuration |
| </li> |
| </ul> |
| <p>All other settings in <tt>BinaryStorageConfiguration.xml</tt> are ignored ! |
| </p><p><br /> |
| </p><p>See <a href="General_JPA_Configuration_in_SMILA.html" title="SMILA/Documentation/General JPA Configuration in SMILA">General JPA Configuration in SMILA</a> for a description on how to configure JPA based implementations. |
| </p> |
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