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| <div class="container top-buffer" id="Gora_Gora DynamoDB Module"> |
| |
| <h2 id="overview">Overview<a class="headerlink" href="#overview" title="Permalink">¶</a></h2> |
| <p>This is the main documentation for the gora-dynamodb module. |
| gora-dynamodb module enables <a href="http://aws.amazon.com/dynamodb/">Amazon DynamoDB</a> backend support for Gora.</p> |
| <div id="toc"><ul><li><a class="toc-href" href="#gora-dynamodb-properties-goraproperties" title="Gora DynamoDB Properties - gora.properties">Gora DynamoDB Properties - gora.properties</a><ul><li><a class="toc-href" href="#accepted-list-of-endpoints" title="Accepted list of endpoints">Accepted list of endpoints</a></li></ul></li><li><a class="toc-href" href="#gora-dynamodb-mapppings-gora-dynamodb-mappingxml" title="Gora DynamoDB mapppings - gora-dynamodb-mapping.xml">Gora DynamoDB mapppings - gora-dynamodb-mapping.xml</a><ul><li><a class="toc-href" href="#table" title="Table">Table</a></li><li><a class="toc-href" href="#attributes" title="Attributes">Attributes</a></li></ul></li></ul></div> |
| <h2 id="gora-dynamodb-properties-goraproperties">Gora DynamoDB Properties - gora.properties<a class="headerlink" href="#gora-dynamodb-properties-goraproperties" title="Permalink">¶</a></h2> |
| <pre><code>gora.datastore.default=org.apache.gora.dynamodb.store.DynamoDBStore |
| gora.datastore.autocreateschema=true |
| preferred.schema.name=Person |
| gora.dynamodb.mapping.file=/path/to/gora-dynamodb-mapping.xml |
| gora.dynamodb.client=sync |
| gora.dynamodb.consistent.reads=true |
| gora.dynamodb.endpoint=http://dynamodb.ap-northeast-1.amazonaws.com/ |
| gora.dynamodb.serialization.type=dynamo |
| </code></pre> |
| <table class="table"> |
| <thead> |
| <tr> |
| <th>Property Key</th> |
| <th>Property Value</th> |
| <th>Required</th> |
| <th>Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td>gora.datastore.default</td> |
| <td>org.apache.gora.dynamodb.store.DynamoDBStore</td> |
| <td>Yes</td> |
| <td>Implementation of the storage class</td> |
| </tr> |
| <tr> |
| <td>gora.datastore.autocreateschema</td> |
| <td>true</td> |
| <td>No</td> |
| <td>Create the table if it doesn’t exist</td> |
| </tr> |
| <tr> |
| <td>preferred.schema.name</td> |
| <td>Person</td> |
| <td>Yes</td> |
| <td>Name of the DynamoDB table/schema</td> |
| </tr> |
| <tr> |
| <td>gora.dynamodb.mapping.file</td> |
| <td>/path/to/gora-dynamodb-mapping.xml</td> |
| <td>No</td> |
| <td>The XML mapping file to be used. Defaults to gora-dynamodb-mapping.xml</td> |
| </tr> |
| <tr> |
| <td>gora.dynamodb.client</td> |
| <td>sync</td> |
| <td>No</td> |
| <td>DynamoDB client type. It could be sync or async.</td> |
| </tr> |
| <tr> |
| <td>gora.dynamodb.consistent.reads</td> |
| <td>true</td> |
| <td>No</td> |
| <td>Default is eventual consistence i.e. false.</td> |
| </tr> |
| <tr> |
| <td>gora.dynamodb.endpoint</td> |
| <td>http://dynamodb.us-east-1.amazonaws.com/</td> |
| <td>Yes</td> |
| <td>Set to geographically closest service endpoint. For accepted list, see <a href="#Accepted">here</a></td> |
| </tr> |
| <tr> |
| <td>gora.dynamodb.serialization.type</td> |
| <td>dynamo</td> |
| <td>No</td> |
| <td>Data store serialization type. It could be 'dynamo' or 'avro'</td> |
| </tr></tbody></table> |
| <h4 id="accepted-list-of-endpoints">Accepted list of endpoints<a class="headerlink" href="#accepted-list-of-endpoints" title="Permalink">¶</a></h4> |
| <ul> |
| <li>http://dynamodb.ap-northeast-1.amazonaws.com/</li> |
| <li>http://dynamodb.ap-northeast-2.amazonaws.com/</li> |
| <li>http://dynamodb.eu-west-1.amazonaws.com/</li> |
| <li>http://dynamodb.us-east-1.amazonaws.com/</li> |
| <li>http://dynamodb.us-west-1.amazonaws.com/</li> |
| <li>http://dynamodb.us-west-2.amazonaws.com/</li> |
| </ul> |
| <h2 id="gora-dynamodb-mapppings-gora-dynamodb-mappingxml">Gora DynamoDB mapppings - gora-dynamodb-mapping.xml<a class="headerlink" href="#gora-dynamodb-mapppings-gora-dynamodb-mappingxml" title="Permalink">¶</a></h2> |
| <p>Say we wished to map some user data and store it into DynamoDB.</p> |
| <pre><code><gora-otd> |
| <table name="Person" readcunit="1" writecunit="1" package="org.apache.gora.dynamodb.example.generated"> |
| <attribute name="ssn" type="N" key="hash"/> |
| <attribute name="date" type="S" key="hashrange"/> |
| <attribute name="firstName" type="S"/> |
| <attribute name="lastName" type="S"/> |
| <attribute name="salary" type="N"/> |
| <attribute name="visitedplaces" type="SS"/> |
| </gora-otd> |
| </code></pre> |
| <p>Within the <code>gora-otd</code> mapping configuration, only the 'table' child element is required.</p> |
| <h3 id="table">Table<a class="headerlink" href="#table" title="Permalink">¶</a></h3> |
| <ul> |
| <li>a parameter containing the DynamoDB table <code>name</code> (String) e.g. Person</li> |
| <li>a parameter containing the read capacity - <code>readcunit</code> (Number) e.g. 1 More about them <a href="https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Limits.html#default-limits-throughput">here</a></li> |
| <li>a parameter containing the write capacity - <code>writecunit</code> (Number) e.g. 1</li> |
| <li>a parameter containing the name of the <code>package</code> having the table (String)</li> |
| </ul> |
| <h3 id="attributes">Attributes<a class="headerlink" href="#attributes" title="Permalink">¶</a></h3> |
| <ul> |
| <li>a parameter containing the <code>name</code> e.g. name, dateOfBirth, ssn and salary</li> |
| <li>a parameter containing the column <code>type</code> to which they belong e.g. (B/L/M/N/S/SS). For more, refer <a href="https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_AttributeValue.html">here</a></li> |
| <li>an optional parameter <code>key</code>. The key can be a hash key (partition key/primary key) or a hashrange key (sort key) (in case of composite primary key). The key parameter is left blank for non-key attributes. For more, refer <a href="https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/HowItWorks.CoreComponents.html#HowItWorks.CoreComponents.PrimaryKey">here</a></li> |
| </ul> |
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