transaction.html

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<A NAME="AUTO_COMMIT"><!-- --></A><H3>
AUTO_COMMIT</H3>
<PRE>
public static final <A HREF="../../../org/geotools/data/Transaction.html" title="interface in org.geotools.data">Transaction</A> <B>AUTO_COMMIT</B></PRE>
<DL>
<DD>Represents AUTO_COMMIT Mode
<P>
<DL>
</DL>
</DL>

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<A NAME="getProperty(java.lang.Object)"><!-- --></A><H3>
getProperty</H3>
<PRE>
public <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A> <B>getProperty</B>(<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A>&nbsp;key)</PRE>
<DL>
<DD>Retrive a Transaction property held by this transaction.

 <p>
 This may be used to provide hints to DataStore implementations, it
 opperates as a blackboard for client, FeatureSource communication.
 </p>

 <p>
 If this proves successful addAuthorization/getAuthorization will be
 replaced with this mechanism.
 </p>
<P>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="getAuthorizations()"><!-- --></A><H3>
getAuthorizations</H3>
<PRE>
public <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/util/Set.html" title="class or interface in java.util">Set</A> <B>getAuthorizations</B>()</PRE>
<DL>
<DD>List of Authorizations IDs held by this transaction.

 <p>
 This list is reset by the next call to commit() or rollback().
 </p>

 <p>
 Authorization IDs are used to provide FeatureLock support.
 </p>
<P>
<DD><DL>

<DT><B>Returns:</B><DD>List of Authorization IDs</DL>
</DD>
</DL>
<HR>

<A NAME="putState(java.lang.Object, org.geotools.data.Transaction.State)"><!-- --></A><H3>
putState</H3>
<PRE>
public void <B>putState</B>(<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A>&nbsp;key,
                     <A HREF="../../../org/geotools/data/Transaction.State.html" title="interface in org.geotools.data">Transaction.State</A>&nbsp;state)</PRE>
<DL>
<DD>Allows FeatureSource to squirel away information( and callbacks ) for
 later.

 <p>
 The most common example is a JDBC DataStore saving the required
 connection for later opperations.
 </p>
 <pre><code>
 ConnectionState implements State {
     public Connection conn;
     public addAuthorization() {}
     public commit(){ conn.commit(); }
     public rollback(){ conn.rollback(); }
 }
 </code></pre>

 <p>
 putState will call State.setTransaction( transaction ) to allow State a
 chance to configure itself.
 </p>
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>key</CODE> - Key used to externalize State<DD><CODE>state</CODE> - Externalized State</DL>
</DD>
</DL>
<HR>

<A NAME="removeState(java.lang.Object)"><!-- --></A><H3>
removeState</H3>
<PRE>
public void <B>removeState</B>(<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A>&nbsp;key)</PRE>
<DL>
<DD>Allows FeatureSources to clean up information ( and callbacks ) they
 earlier provided.

 <p>
 Care should be taken when using shared State to not remove State
 required by another FeatureSources.
 </p>

 <p>
 removeState will call State.setTransaction( null ) to allow State a
 chance cleanup after itself.
 </p>
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>key</CODE> - Key that was used to externalize State</DL>
</DD>
</DL>
<HR>

<A NAME="getState(java.lang.Object)"><!-- --></A><H3>
getState</H3>
<PRE>
public <A HREF="../../../org/geotools/data/Transaction.State.html" title="interface in org.geotools.data">Transaction.State</A> <B>getState</B>(<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A>&nbsp;key)</PRE>
<DL>
<DD>Allows DataStores to squirel away information( and callbacks ) for
 later.

 <p>
 The most common example is a JDBC DataStore saving the required
 connection for later opperations.
 </p>
<P>
<DD><DL>

<DT><B>Returns:</B><DD>Current State externalized by key, or <code>null</code> if not
         found</DL>
</DD>
</DL>
<HR>

<A NAME="commit()"><!-- --></A><H3>
commit</H3>
<PRE>
public void <B>commit</B>()
            throws <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/io/IOException.html" title="class or interface in java.io">IOException</A></PRE>
<DL>
<DD>Makes all transactions made since the previous commit/rollback
 permanent.

 <p>
 FeatureSources will need to issue any changes notifications using a
 FeatureEvent.FEATURES_CHANGED to all FeatureSources with the same
 typeName and a different Transaction. FeatureSources with the same
 Transaction will of been notified of changes as the FeaureWriter made
 them.
 </p>
<P>
<DD><DL>

<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../org/geotools/data/DataSourceException.html" title="class in org.geotools.data">DataSourceException</A></CODE> - if there are any datasource errors.
<DD><CODE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/io/IOException.html" title="class or interface in java.io">IOException</A></CODE><DT><B>See Also:</B><DD><CODE>#setAutoCommit(boolean)</CODE></DL>
</DD>
</DL>
<HR>

<A NAME="rollback()"><!-- --></A><H3>
rollback</H3>
<PRE>
public void <B>rollback</B>()
              throws <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/io/IOException.html" title="class or interface in java.io">IOException</A></PRE>
<DL>
<DD>Undoes all transactions made since the last commit or rollback.

 <p>
 FeatureSources will need to issue any changes notifications using a
 FeatureEvent.FEATURES_CHANGED. This will need to be issued to all
 FeatureSources with the same typeName and Transaction.
 </p>
<P>
<DD><DL>

<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../org/geotools/data/DataSourceException.html" title="class in org.geotools.data">DataSourceException</A></CODE> - if there are problems with the datasource.
<DD><CODE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/UnsupportedOperationException.html" title="class or interface in java.lang">UnsupportedOperationException</A></CODE> - if the rollback method is not
         supported by this datasource.
<DD><CODE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/io/IOException.html" title="class or interface in java.io">IOException</A></CODE><DT><B>See Also:</B><DD><CODE>#setAutoCommit(boolean)</CODE></DL>
</DD>
</DL>
<HR>

<A NAME="addAuthorization(java.lang.String)"><!-- --></A><H3>
addAuthorization</H3>
<PRE>
public void <B>addAuthorization</B>(<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/String.html" title="class or interface in java.lang">String</A>&nbsp;authID)
                      throws <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/io/IOException.html" title="class or interface in java.io">IOException</A></PRE>
<DL>
<DD>Provides an Authorization ID for this Transaction.

 <p>
 All proceeding modifyFeatures,removeFeature, unLockFeatures, refreshLock
 and ReleaseLock operations will make use of the provided authorization.
 </p>

 <p>
 Authorization is only maintained until the this Transaction is commited
 or rolledback.
 </p>

 <p>
 That is operations will only succeed if affected features either:
 </p>

 <ul>
 <li>
 not locked
 </li>
 <li>
 locked with the provided authID
 </li>
 </ul>

 <p>
 Authorization ID is provided as a String, rather than a FeatureLock, to
 account for across process lock use.
 </p>
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>authID</CODE> - 
<DT><B>Throws:</B>
<DD><CODE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/io/IOException.html" title="class or interface in java.io">IOException</A></CODE></DL>
</DD>
</DL>
<HR>

<A NAME="putProperty(java.lang.Object, java.lang.Object)"><!-- --></A><H3>
putProperty</H3>
<PRE>
public void <B>putProperty</B>(<A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A>&nbsp;key,
                        <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A>&nbsp;value)
                 throws <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/io/IOException.html" title="class or interface in java.io">IOException</A></PRE>
<DL>
<DD>Provides a Transaction property for this Transasction.

 <p>
 All proceeding FeatureSource (for FeatureReader/Writer) opperations may
 make use of the provided property.
 </p>
<P>
<DD><DL>

<DT><B>Throws:</B>
<DD><CODE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/io/IOException.html" title="class or interface in java.io">IOException</A></CODE></DL>
</DD>
</DL>
<HR>

<A NAME="close()"><!-- --></A><H3>
close</H3>
<PRE>
public void <B>close</B>()
           throws <A HREF="http://java.sun.com/j2se/1.4/docs/api/java/io/IOException.html" title="class or interface in java.io">IOException</A></PRE>
<DL>
<DD>Provides an oppertunity for a Transaction to free an State it maintains.
 <p>
 This method should call State.setTransaction( null ) on all State it
 maintains.
 </p>
 <p>
 It is hoped that FeatureStore implementations that have externalized
 their State with the transaction take the oppertunity to revert to
 Transction.AUTO_COMMIT.
 </p>
<P>
<DD><DL>

<DT><B>Throws:</B>
<DD><CODE><A HREF="http://java.sun.com/j2se/1.4/docs/api/java/io/IOException.html" title="class or interface in java.io">IOException</A></CODE></DL>
</DD>
</DL>
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