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Added: oodt/branches/wengine-branch/filemgr/src/site/xdoc/user/index.xml
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+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+ Copyright (c) 2006 California Institute of Technology.
+ ALL RIGHTS RESERVED. U.S. Government sponsorship acknowledged.
+
+ $Id$
+-->
+
+<document>
+ <properties>
+ <title>CAS File Manager User Guide</title>
+ <author email="Chris.Mattmann@jpl.nasa.gov">Chris Mattmann</author>
+ </properties>
+
+ <body>
+ <section name="User Guide">
+ <p>
+ This is the user guide for the OODT Catalog and Archive Service (CAS) File Manager
+ component, or File Manager for short. This guide explains the File Manager architecture
+ including its extension points. The guide also discusses available services provided
+ by the File Manager, how to utilize them, and the different APIs that exist. The guide
+ concludes with a description of File Manager use cases.
+ </p>
+ </section>
+ <section name="Architecture">
+ <p>The File Manager component is responsible for tracking, ingesting and moving file
+ data and metadata between a client system and a server system. The File Manager is an
+ extensible software component that provides an XML-RPC external interface, and a fully
+ tailorable Java-based API for file management. The critical objects managed by the File
+ Manager include:</p>
+
+ <ul>
+ <li>Products - Collections of one or more files, and their associated Metadata.</li>
+ <li>Metadata - A map of key->multiple values of descriptive information about a Product.</li>
+ <li>Reference - A pointer to a Product file's original location, and to its final resting
+ location within the archive constructed by the File Manager.</li>
+ <li>Product Type - Descriptive information about a Product that includes what type of file
+ URI generation scheme to use, the root repository location for a particular Product, and a
+ description of the Product.</li>
+ <li>Element - A singular Metadata element, such as "Author", or "Creator". Elements may
+ have additional metadata, in the form of the associated definition and even a corresponding
+ Dublin Core attribute.
+ </li>
+ <li>Versioner - A URI generation scheme for Product Types that defines the location within
+ the archive (built by the File Manager) where a file belonging to a Product (that belongs to
+ the associated Product Type) should be placed.
+ </li>
+ </ul>
+
+ <p>Each Product contains 1 or more References, and one Metadata object. Each Product is a member
+ of a single Product Type. The Metadata collected for each Product is defined by a mapping of
+ Product Type->1...* Elements. Each Product Type has an associated Versioner. These relationships
+ are shown in the below figure.</p>
+
+ <img src="../images/fm_object_model.png" alt="File Manager Object Model"/>
+
+ <subsection name="Extension Points">
+ <p>
+ There are several extension points for the File Manager. An extension point is an interface
+ within the file manager that can have many implementations. This is particularly useful when
+ it comes to software component configuration because it allows different implementations of an
+ existing interface to be selected at deployment time. So, the File Manager component may
+ communicate with a Database-based Catalog, and an XML-based Element Store (called a Validation
+ Layer), or it may use a Lucene-based Catalog and a Database-based Validation Layer. The selection
+ of the actual component implementations is handled entirely by the extension point mechanism.
+ Using extension points, it is fairly simple to support many different types of what are typically
+ referred to as âplug-in architecturesâ Each of the core extension points for the File Manager is
+ described below:</p>
+
+ <table>
+ <tr>
+ <td>Catalog</td>
+ <td>The Catalog extension point is responsible for storing all the instance data for
+ Products, Metadata, and for file References. Additionally, the Catalog provides a query
+ capability for Products.
+ </td>
+ </tr>
+ <tr>
+ <td>Data Transfer</td>
+ <td>The Data Transfer extension point allows for the movement of a Product to and from
+ the archive managed by the File Manager component. Different protocols for Data Transfer
+ may include local (disk-based) copy, or remote XML-RPC based transfer across networked
+ machines.
+ </td>
+ </tr>
+ <tr>
+ <td>Repository Manager</td>
+ <td>The Repository Manager extension point provides a means for managing all of the
+ policy information (i.e., the Product Types and their associated information) for
+ Products managed by the File Manager.
+ </td>
+ </tr>
+ <tr>
+ <td>Validation Layer</td>
+ <td>The Validation Layer extension point allows for the querying of element definitions
+ associated with a particular Product Type. The extension point also maps Product Type to
+ Elements.
+ </td>
+ </tr>
+ <tr>
+ <td>Versioning</td>
+ <td>The Versioning extension point allows for the definition of different URI generation
+ schemes that define the final resting location of files for a particular Product.
+ </td>
+ </tr>
+ <tr>
+ <td>System</td>
+ <td>The extension point that provides the external interface to the File Manager
+ services. This includes the File Manager server interface, as well as the associated
+ File Manager client interface, that communicates with the server.
+ </td>
+ </tr>
+
+ </table>
+
+ <p>The relationships between the extension points for the File Manager are shown in the below
+ Figure.
+ </p>
+
+ <img src="../images/fm_extension_points.png" alt="File Manager Extension Points"/>
+
+ </subsection>
+ <subsection name="Key Capabilities">
+ <p>The File Manager is responsible for providing the necessary key capabilities for managing
+ files and metadata. Each high level capability provided by the File Manager is detailed below:</p>
+
+ <ol>
+ <li>Easy Management of different types of Products â The Repository Manager extension point
+ is responsible for managing Product Types, and their associated information. Management of
+ Product Types includes adding new ones, deleting and updating existing ones, and retrieving
+ Product Types, by their ID or by their name.</li>
+ <li>Support for different kinds of back end catalogs â The Catalog extension point allows
+ Product instance metadata and file location information to be stored in different types of
+ back end data stores quite easily. Existing implementations of the Catalog interface include
+ a JDBC based backend database, along with a flat-file based, Lucene index.</li>
+ <li>Management of Product instance information â The management includes adding, deleting and
+ updating product instance information, including file locations (References), along with Product
+ Metadata. It also includes getting Metadata, and getting References associated with existing
+ Products. It also includes obtaining the Products themselves.</li>
+ <li>Separating out the Element management layer for Metadata â The File Manager Validation Layer
+ extension points allows for the management of Element policy information in different types of
+ back end stores. For instance, Element policy could be stored in XML files, a Database, or even a
+ Metadata Registry.</li>
+ <li>Supporting different Data Transfer Mechanisms â By having an extension point for Data Transfer,
+ the File Manager can support different Data Transfer protocols, both local and remote.</li>
+ <li>Allowing for different Back End File Repository Layouts â The Versioner extension points allows
+ for different File Repository Layouts based on Product Types.</li>
+ <li>Allowing for Hierarchical collections of files and directories making up a Product â The File
+ Manager Client allows for Products to be Flat, or Hierarchical-based. Flat products are collections
+ of singular files that are aggregated together to make a Product. Hierarchical Products are Products
+ that contain collections of directories, and sub-directories, and files.</li>
+ <li>Scalability â The File Manager uses the popular client-server paradigm, allowing new File Manager
+ servers to be instantiated, as needed, without affecting the File Manager clients, and vice-versa. </li>
+ <li>Communication over lightweight, standard protocols â The File Manager uses XML-RPC, as its main
+ external interface, between File Manager client and server. XML-RPC, the little brother of SOAP, is
+ fast, extensible, and uses the underlying HTTP protocol for data transfer.</li>
+ <li>RSS based Product Syndication â The File Manager web interface allows for the RSS-based syndication
+ of Product feeds based on Product Type.</li>
+ <li>Data Transfer Status Tracking â The File Manager tracks all current Product and File transfers and
+ even publishes an RSS-feed of existing transfers.</li>
+ </ol>
+
+ <p>This capability set is not exhaustive, and is meant to give the user a âfeelâ for what
+ general features are provided by the File Manager. Most likely the user will find that the
+ File Manager provides many other capabilities besides those described here.</p>
+
+ </subsection>
+ <subsection name="Current Extension Point Implementations">
+
+ <p>There are at least two implementations of all of the aforementioned extension points for
+ the File Manager. Each extension point implementation is detailed below:</p>
+
+ <ul>
+ <li><b>Catalog</b><br/>
+ <ol>
+ <li>Data Source based Catalog â an implementation of the Catalog extension point interface
+ that uses a JDBC accessible database backend.</li>
+ <li>Lucene based Catalog â an implementation of the Catalog extension point interface that
+ uses the Lucene free text index system to store Product instance information.</li>
+ </ol>
+ </li>
+ <li><b>Data Transfer</b><br/>
+ <ol>
+ <li>Local Data Transfer â an implementation of the Data Transfer interface that uses
+ Apacheâs <a href="http://jakarta.apache.org/commons-io/">commons-io</a> to perform local,
+ disk based filesystem data transfer. This implementation also supports locally accessible
+ Network File System (NFS) disks.
+ </li>
+ <li>Remote Data Transfer â an implementation of the Data Transfer interface that uses the
+ XML-RPC File Manager client to transfer files to a remote XML-RPC File Manager server.
+ </li>
+ <li>InPlace Data Transfer - an implementation of the Data Transfer interface that avoids
+ transfering any products -- this can be used in the situation where metadata about a
+ particular product should be recorded, but no physical transfer needs to occur.
+ </li>
+ </ol>
+ </li>
+ <li><b>Repository Manager</b><br/>
+ <ol>
+ <li>Data Source based Repository Manager â an implementation of the Repository Manager
+ extension point that stores Product Type policy information in a JDBC accessible database.
+ </li>
+ <li>XML based Repository Manager â an implementation of the Repository Manager extension
+ point that stores Product Type policy information in an XML file called <code>product-types.xml</code>
+ </li>
+ </ol>
+ </li>
+ <li><b>Validation Layer</b><br/>
+ <ol>
+ <li>Data Source based Validation Layer â an implementation of the Validation Layer
+ extension point that stores Element policy information in a JDBC accessible database.
+ </li>
+ <li>XML based Validation Layer â an implementation of the Validation Layer extension
+ point that stores Element policy information in 2 XML files called <code>elements.xml</code> and
+ <code>product-type-element-map.xml</code>
+ </li>
+ </ol>
+ </li>
+ <li><b>System (File Manager client and File Manager server)</b><br/>
+ <ol>
+ <li>XML-RPC based File Manager server â an implementation of the external server interface
+ for the File Manager that uses XML-RPC as the transportation medium.
+ </li>
+ <li>XML-RPC based File Manager client â an implementation of the client interface for the
+ XML-RPC File Manager server that uses XML-RPC as the transportation medium.
+ </li>
+ </ol>
+ </li>
+ </ul>
+
+ </subsection>
+
+ </section>
+ <section name="Configuration and Installation">
+ <p>
+ To install the File Manager, you need to download a <a href="http://oodt.jpl.nasa.gov/cas-filemgr/">release</a>
+ of the file manager, available from its home web site. For bleeding-edge features, you can
+ also check out the cas-filemgr trunk project from the OODT subversion repository. You can browse
+ the repository using ViewCVS, located at:
+
+ <code>http://oodt.jpl.nasa.gov/vc/svn/</code>
+
+ The actual web url for the repository is located at:
+
+ <code>http://oodt.jpl.nasa.gov/repo/</code>
+
+ To check out the File Manager, use your favorite Subversion client. Several clients are
+ listed a <a href="http://oodt.jpl.nasa.gov/wiki/display/oodt/Subversion">
+ http://oodt.jpl.nasa.gov/wiki/display/oodt/Subversion</a>.
+ </p>
+
+ <subsection name="Project Organization">
+ <p>
+ The cas-filemgr project follows the traditional Subversion-style <code>trunk</code>, <code>tag</code>
+ and <code>branches</code> format. Trunk corresponds to the latest and greatest development on the
+ cas-filemgr. Tags are official release versions of the project. Branches correspond to deviations
+ from the trunk large enough to warrant a separate development tree. </p>
+
+ <p>For the purposes of this the User Guide, we'll assume you already have downloaded a built release
+ of the file manager, from its web site. If you were building cas-filemgr from the trunk, a tagged release
+ (or branch) the process would be quite similar. To build cas-filemgr, you would need the Apache Maven
+ software. Maven is an XML-based, project management system similar to Apache Ant, but with many extra
+ bells and whistles. Maven makes cross-platform project development a snap. You can download Maven from:
+
+ <a href="http://maven.apache.org">http://maven.apache.org</a>
+
+ All cas-filemgr releases post 1.5.0 are now <b>Maven 2 compatible</b>. This is <b>very</b> important.
+ That means that if you have any cas-filemgr release > 1.5.0, you will need Maven 2 to compile the software,
+ and Maven 1 will no longer work.</p>
+
+ <p>Follow the procedures in the below Sections to build a fresh copy of the File Manager. These procedures
+ are specifically targeted on using Maven 2 to build the software:
+ </p>
+
+ </subsection>
+
+ <subsection name="Building the File Manager">
+ <p>
+ <ol>
+ <li>cd to cas-filemgr, and then type:
+ <source># mvn package</source>
+ This will perform several tasks, including compiling the source code, downloading
+ required jar files, running unit tests, and so on. When the command completes, cd
+ to the <code>target</code> directory within cas-filemgr. This will contain the build of the
+ File Manager component, of the following form:
+
+ <source>
+ cas-filemgr-${version}-dist.tar.gz
+ </source>
+
+ This is a distribution tar ball, that you would copy to a deployment directory, such as
+ <code>/usr/local/</code>, and then unpack using <code># tar xvzf </code>. The resultant directory
+ layout from the unpacked tarball is as follows:
+
+ <source>
+ bin/ etc/ logs/ doc/ lib/ policy/ LICENSE.txt CHANGES.txt
+ </source>
+ <ul>
+ <li>bin - contains the "filemgr" server script, and the "filemgr-client" client script.</li>
+ <li>etc - contains the logging.properties file for the File Manager, and the filemgr.properties
+ file used to configure the server options.</li>
+ <li>logs - the default directory for log files to be written to.</li>
+ <li>doc - contains Javadoc documentation, and user guides for using the particular CAS component.</li>
+ <li>lib - the required Java jar files to run the File Manager.</li>
+ <li>policy â the default XML-based element and product type policy in
+ case the user is using the XML Repository Manager and/or the XML Validation
+ Layer.</li>
+ <li>CHANGES.txt - contains the CHANGES present in this released version of the CAS component.</li>
+ <li>LICENSE.txt - the LICENSE for the File Manager project.</li>
+ </ul>
+ </li>
+ </ol>
+ </p>
+
+ </subsection>
+ <subsection name="Deploying the File Manager">
+ <p>To deploy the file manager, you'll need to create an installation directory. Typically this
+ would be somewhere in /usr/local (on *nix style systems), or C:\Program Files\ (on windows
+ style systems). We'll assume that you're installing on a *nix style system though the Windows
+ instructions are quite similar.</p>
+
+ <p>Follow the process below to deploy the File Manager:</p>
+
+ <ol>
+ <li>Copy the binary distribution to the deployment directory
+ <source># cp -R cas-filemgr/trunk/target/cas-filemgr-${version}-dist.tar.gz /usr/local/</source>
+ </li>
+ <li>Untar the distribution
+ <source># cd /usr/local ; tar xvzf cas-filemgr-${version}-dist.tar.gz</source>
+ </li>
+ <li>Set up a symlink
+ <source># ln -s /usr/local/cas-filemgr-${version} /usr/local/filemgr</source>
+ </li>
+ <li>edit /usr/local/filemgr/bin/filemgr
+ <ul>
+ <li>Set the <code>SERVER_PORT</code> variable to the desired port you'd like to run the
+ File Manager server on.
+ </li>
+ <li>Set the <code>JAVA_HOME</code> variable to point to the location of your installed
+ JRE runtime.
+ </li>
+ <li>Set the <code>RUN_HOME</code> variable to point to the location you'd like the File
+ Manager PID file written to. Typically this should default to <code>/var/run</code>, but not all
+ system administrators allow users to write to <code>/var/run</code>.
+ </li>
+ </ul>
+ </li>
+ <li>edit <code>/usr/local/filemgr/bin/filemgr-client</code>
+ <ul>
+ <li>Set the <code>JAVA_HOME</code> variable to point to the location of your installed JRE runtime.
+ </li>
+ </ul>
+ </li>
+ <li>(optional) edit <code>/usr/local/filemgr/etc/logging.properties</code>
+ <ul>
+ <li>Set the logging levels for each subsystem to the desired level. The system
+ defaults are fairly considerate and prevent much of the logging at levels below <code>INFO</code>
+ to the console. </li>
+ </ul>
+ </li>
+ <li>edit <code>/usr/local/filemgr/etc/filemgr.properties</code>
+ <ul>
+ <li>This java properties file contains all of the default information properties to
+ configure the File Manager. By default, the File Manager is built to use the XML-based
+ repository manager and validation layer extension points, the DataSource based catalog
+ extension point, and the local data transfer interface. These defaults can be changed
+ quite easily by changing the factory classes that are pointed to for each extension
+ point. For example, to use the Lucene-based cataog extension point, you would change
+ the following property, <code>filemgr.catalog.factory</code> to <code>gov.nasa.jpl.oodt.cas.filemgr.catalog.LuceneCatalogFactory</code>
+ </li>
+ <li>You need to configure the properties for each of the extension points that you are
+ using. By default, you would at least need to configure:
+ <ul>
+ <li>The JDBC connection information for the data source catalog.</li>
+ <li>The paths to the directories where the XML policy files are stored for the
+ validation layer and for the repository manager. A good default location is to
+ place these files within /usr/local/filemgr/policy.</li>
+ </ul>
+ </li>
+ </ul>
+ </li>
+ </ol>
+
+ <p>Other configuration options are possible: check the <a href="../apidocs">API documentation</a>,
+ as well as the comments within the filemgr.properties file to find out the rest of the configurable
+ properties for the extension points you choose. A full listing of all the extension point factory
+ class names are provided in the Appendix. After step 7, you are officially done configuring the File
+ Manager for deployment.</p>
+
+ </subsection>
+ <subsection name="Running the File Manager">
+ <p>To run the filemgr, cd to <code>/usr/local/filemgr/bin</code> and type:</p>
+
+ <source># ./filemgr start</source>
+
+ <p>This will startup the file manager XML-RPC server interface. Your File Manager
+ is now ready to run! You can test out the file manager by running a simple ingest
+ command using the filemgr-client command below. First create a simple text file
+ called "blah.txt" and place it inside /usr/local/filemgr/bin. Then, create a blank
+ metadata file for the product, using the <a href="http://oodt.jpl.nasa.gov/vc/svn/cas-metadata/trunk/src/conf/cas.metadata.xsd">schema</a>
+ or <a href="http://oodt.jpl.nasa.gov/vc/svn/cas-metadata/trunk/src/conf/cas.metadata.dtd">DTD</a>
+ provided in the cas-metadata project. An example XML file might be:</p>
+
+ <source>
+ <cas:metadata xmlns:cas="http://oodt.jpl.nasa.gov/1.0/cas">
+ </cas:metadata>
+ </source>
+
+ <p>Call this metadata file <code>blah.txt.met</code>, and place it also in <code>/usr/local/filemgr/bin</code>.
+ Then, run the below command, assuming that you started the File Manager on the default port of <code>9000</code>:</p>
+
+ <source># ./filemgr-client --url http://localhost:9000 --operation --ingestProduct --productName Blah.txt \
+ --productStructure Flat --productTypeName GenericFile --metadataFile file:/usr/local/filemgr/bin/blah.txt.met \
+ --clientTransfer --dataTransfer gov.nasa.jpl.oodt.cas.filemgr.datatransfer.LocalDataTransferFactory \
+ --refs file:/usr/local/filemgr/bin/blah.txt
+ </source>
+
+ <p>You should see a response message at the end similar to:</p>
+
+ <source>
+ Jul 15, 2006 10:37:53 PM gov.nasa.jpl.oodt.cas.filemgr.system.XmlRpcFileManagerClient <init><br/>
+ INFO: Loading File Manager Configuration Properties from: [../etc/filemgr.properties]<br/>
+ Jul 15, 2006 10:37:54 PM gov.nasa.jpl.oodt.cas.filemgr.system.XmlRpcFileManagerClient ingestProduct<br/>
+ FINEST: File Manager Client: clientTransfer enabled: transfering product [Blah.txt]<br/>
+ Jul 15, 2006 10:37:54 PM gov.nasa.jpl.oodt.cas.filemgr.versioning.VersioningUtils <br/>
+ createBasicDataStoreRefsFlat<br/>
+ FINE: VersioningUtils: Generated data store ref: file:/tmp/files/Blah.txt/blah.txt from<br/>
+ origRef: file:/usr/local/filemgr/bin/blah.txt<br/>
+ Jul 15, 2006 10:37:54 PM gov.nasa.jpl.oodt.cas.filemgr.datatransfer.LocalDataTransferer <br/>
+ moveFilesToProductRepo<br/>
+ INFO: LocalDataTransfer: Moving File: file:/usr/local/filemgr/bin/blah.txt to <br/>
+ file:/tmp/files/Blah.txt/blah.txt<br/>
+ ingestProduct: Result: 3a812d86-148d-11db-a25a-f388f524a371
+ </source>
+
+ <p>which means that everything installed okay!</p>
+
+
+
+ </subsection>
+
+ </section>
+ <section name="Use Cases">
+ <p>
+ The File Manager was built to support several of the above capabilities outlined in
+ Section 3. In particular there were several use cases that we wanted to support, some
+ of which are described below.
+ </p>
+
+ <img src="../images/fm_use_case1.png" alt="File Manager Ingest Use Case"/>
+
+ <p>The red numbers in the above Figure correspond to a sequence of steps that occurs and a
+ series of interactions between the different File Manager extension points in order to
+ perform the file ingestion activity. In Step 1, a File Manager client is invoked for the
+ ingest operation, which sends Metadata and References for a particular Product to ingest
+ to the File Manager serverâs System Interface extension point. The System Interface uses
+ the information about Product Type policy made available by the Repository Manager in order
+ to understand whether or not the product should be transferred, where itâs root repository
+ path should be, and so on. The System Interface then catalogs the file References and Metadata
+ using the Catalog extension point. During this catalog process, the Catalog extension point
+ uses the Validation Layer to determine which Elements should be extracted for the particular
+ Product, based upon its Product Type. After that, Data Transfer is initiated either at the
+ client or server end, and the first step to Data Transfer is using the Productâs associated
+ Versioner to generate final file References. After final file References have been determined,
+ the file data is transferred by the server or by the client, using the Data Transfer extension
+ point.</p>
+
+ </section>
+ <section name="Appendix">
+ <p>
+ Full list of File Manager extension point classes and their associated property names from the
+ filemgr.properties file:
+ </p>
+
+ <table>
+ <tr>
+ <td>filemgr.catalog.factory</td>
+ <td>gov.nasa.jpl.oodt.cas.filemgr.catalog.DataSourceCatalogFactory<br/>
+ gov.nasa.jpl.oodt.cas.filemgr.catalog.LuceneCatalogFactory
+ </td>
+ </tr>
+ <tr>
+ <td>filemgr.repository.factory</td>
+ <td>gov.nasa.jpl.oodt.cas.filemgr.repository.DataSourceRepositoryManagerFactory<br/>
+ gov.nasa.jpl.oodt.cas.filemgr.repository.XMLRepositoryManagerFactory
+ </td>
+ </tr>
+ <tr>
+ <td>filemgr.datatransfer.factory</td>
+ <td>gov.nasa.jpl.oodt.cas.filemgr.datatransfer.LocalDataTransferFactory<br/>
+ gov.nasa.jpl.oodt.cas.filemgr.datatransfer.RemoteDataTransferFactory<br/>
+ gov.nasa.jpl.oodt.cas.filemgr.datatransfer.InPlaceDataTransferFactory
+ </td>
+ </tr>
+ <tr>
+ <td>filemgr.validationLayer.factory</td>
+ <td>gov.nasa.jpl.oodt.cas.filemgr.validation.DataSourceValidationLayerFactory<br/>
+ gov.nassa.jpl.oodt.cas.filemgr.validation.XMLValidationLayerFactory
+ </td>
+ </tr>
+ </table>
+
+ </section>
+ </body>
+
+</document>
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