120 lines
6.8 KiB
HTML
120 lines
6.8 KiB
HTML
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<meta name="DC.Type" content="reference" />
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<meta name="DC.Title" content="ClusteredHashTable classes" />
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<meta name="abstract" content="The ClusteredHashTable classes enable your Java programs to use highly available clustered hash tables to share and replicate data to nonpersistent storage among the nodes in a cluster." />
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<title>ClusteredHashTable classes</title>
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</head>
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<body id="clusteredhshtbl"><a name="clusteredhshtbl"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">ClusteredHashTable classes</h1>
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<div><p>The ClusteredHashTable classes enable your Java™ programs
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to use highly available clustered hash tables to share and replicate data
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to nonpersistent storage among the nodes in a cluster. </p>
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<div class="section"><p>To use the ClusteredHashTable classes, ensure that you can use
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nonpersistent storage for the data. Replicated data is not encrypted.</p>
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<div class="note"><span class="notetitle">Note:</span> The
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following information assumes that you understand the concepts and terminology
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common to iSeries™ clustering.
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For more information about clusters and how to use them, see <a href="../rzaig/rzaigicclust.htm">Clusters</a>.</div>
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<p>Using
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the ClusteredHashTable class requires that you have defined and activated
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a cluster on the iSeries systems. You must also start a clustered
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has table server. For more information, see <a href="../rzaig/rzaigconfigure.htm">Configure clusters</a> and <a href="../apis/clust4a1TOC.htm">Clustered Hash Table APIs</a>.</p>
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<p>Required parameters
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are the name of the clustered hash table server and the AS400 object, which
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represents the system that contains the clustered hash table server.</p>
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<p>In
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order to store data in a clustered hash table server, you need a connection
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handle and a key:</p>
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<ul><li> When you open a connection, the clustered hash table server assigns the
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connection handle that you must specify on subsequent requests to the clustered
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hash table server. This connection handle is good only for the instantiated
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AS400 object, so you must open another connection if you use a different
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AS400 object.</li>
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<li>You must specify the key to access and change data in the clustered hash
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table. Duplicate keys are not supported.</li>
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</ul>
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<p>The <a href="javadoc/com/ibm/as400/access/ClusteredHashTable.html">ClusteredHashTable</a> class provides methods that enable
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you to perform the following actions:</p>
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<ul><li><a href="javadoc/com/ibm/as400/access/ClusteredHashTable.html#OPEN()">Open a connection</a> to the clustered hash table server
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job</li>
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<li><a href="javadoc/com/ibm/as400/access/ClusteredHashTable.html#GENERATEKEY()">Generate a unique key</a> to store data into the clustered
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hash table</li>
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<li><a href="javadoc/com/ibm/as400/access/ClusteredHashTable.html#CLOSE()">Close the active connection</a> to the clustered hash table
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server job</li>
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</ul>
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<p>Some methods in the ClusteredHashTable class use the <a href="javadoc/com/ibm/as400/access/ClusteredHashTableEntry.html">ClusteredHashTableEntry</a>
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class to perform the following actions:</p>
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<ul><li><a href="javadoc/com/ibm/as400/access/ClusteredHashTable.html#GET(BYTE[])">Get an entry</a> from the clustered hash table</li>
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<li><a href="javadoc/com/ibm/as400/access/ClusteredHashTable.html#PUT(COM.IBM.AS400.ACCESS.CLUSTEREDHASHTABLEENTRY)">Store an entry</a> in the clustered hash table</li>
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<li><a href="javadoc/com/ibm/as400/access/ClusteredHashTable.html#ELEMENTS()">Get a list of entries</a> from the clustered hash table for
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all user profiles</li>
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</ul>
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</div>
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<div class="section" id="clusteredhshtbl__useclhashtbl"><a name="clusteredhshtbl__useclhashtbl"><!-- --></a><h4 class="sectiontitle">Example: Using ClusteredHashTable</h4><p>The
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following example operates on clustered hash table server named CHTSVR01.
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It assumes a cluster and a clustered hash table server is already active.
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It opens a connection, generates a key, puts an entry using the new key in
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the clustered hash table, gets an entry from the clustered hash table, and
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closes the connection.</p>
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<pre> ClusteredHashTableEntry myEntry = null;
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String myData = new String("This is my data.");
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System.out.println("Data to be stored: " + myData);
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AS400 system = new AS400();
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ClusteredHashTable cht = new ClusteredHashTable(system,"CHTSVR01");
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// Open a connection.
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cht.open();
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// Get a key to the hash table.
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byte[] key = null;
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key = cht.generateKey();
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// Prepare some data that you want to store into the hash table.
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// ENTRY_AUTHORITY_ANY_USER means that any user can access the
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// entry in the clustered hash table.
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// DUPLICATE_KEY_FAIL means that if the specified key already exists,
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// the ClusteredHashTable.put() request will not succeed.
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int timeToLive = 500;
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myEntry = new ClusteredHashTableEntry(key,myData.getBytes(),timeToLive,
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ClusteredHashTableEntry.ENTRY_AUTHORITY_ANY_USER,
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ClusteredHashTableEntry.DUPLICATE_KEY_FAIL);
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// Store (or put) the entry into the hash table.
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cht.put(myEntry);
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// Get an entry from the hash table.
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ClusteredHashTableEntry output = cht.get(key);
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// Close the connection.
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cht.close();</pre>
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<p>Using the ClusteredHashTable class causes
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the AS400 object to connect to the server. For more information, see <a href="mngcon.htm#mngcon">Managing connections</a>. </p>
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</div>
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</div>
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</body>
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</html> |