12:37 p.m.
Author: ataylor
Date: 2011-03-07 06:37:16 -0500 (Mon, 07 Mar 2011)
New Revision: 10293
Modified:
branches/Branch_2_2_EAP/examples/jms/clustered-static-oneway/readme.html
branches/Branch_2_2_EAP/examples/jms/clustered-static-oneway/server0/hornetq-configuration.xml
branches/Branch_2_2_EAP/examples/jms/clustered-static-oneway/server1/hornetq-configuration.xml
branches/Branch_2_2_EAP/examples/jms/clustered-static-oneway/src/org/hornetq/jms/example/ClusterStaticOnewayExample.java
Log:
fixed one way clustered example and wrote read me
Modified: branches/Branch_2_2_EAP/examples/jms/clustered-static-oneway/readme.html
===================================================================
--- branches/Branch_2_2_EAP/examples/jms/clustered-static-oneway/readme.html 2011-03-07
10:19:59 UTC (rev 10292)
+++ branches/Branch_2_2_EAP/examples/jms/clustered-static-oneway/readme.html 2011-03-07
11:37:16 UTC (rev 10293)
@@ -6,29 +6,35 @@
<script type="text/javascript"
src="../../common/prettify.js"></script>
</head>
<body onload="prettyPrint()">
- <h1>JMS Load Balanced Static Clustered Queue Example</h1>
+ <h1>JMS Load Balanced Static Clustered One Way Queue Example</h1>
- <p>This example demonstrates a JMS queue deployed on two different nodes. The
two nodes are configured to form a cluster
- from a <em>static</em> list of nodes.</p>
+ <p>This example demonstrates a JMS queue deployed on three different nodes.
The three nodes are configured to form a one way cluster
+ from a <em>static</em> list of nodes. </p>
+ <p>A one way cluster is different from a symmetrical cluster in that each node
is only connected to one another node in
+ a chain type fashion, so server 0 -> server 1 -> server 2</p>
<p>We then create a consumer on the queue on each node, and we create a
producer on only one of the nodes.</p>
- <p>We then send some messages via the producer, and we verify that
<b>both</b> consumers receive the sent messages
+ <p>We then send some messages via the producer, and we verify that
<b>all</b> consumers receive the sent messages
in a round-robin fashion.</p>
<p>In other words, HornetQ <b>load balances</b> the sent messages
across all consumers on the cluster</p>
<p>This example uses JNDI to lookup the JMS Queue and ConnectionFactory
objects. If you prefer not to use
JNDI, these could be instantiated directly.</p>
- <p>Here's the relevant snippet from the server configuration, which tells
the server to form a cluster between the two nodes
- and to load balance the messages between the nodes.</p>
+ <p>Here's the relevant snippet from the server configuration, which tells
the server to form a one way cluster between the three nodes
+ and to load balance the messages between the nodes. Note that we have set
<em>allow-direct-connections-only</em> to true,
+ this means that this server will only ever connect the address's specified in
the list of connectors. ALso notice
+ that <em>max-hops</em> is 2, this is because server 0 is not directly
connected to server 2, 2 hops in fact, so we
+ allow any updates from servers up to 2 hops away</p>
<pre class="prettyprint">
- <code><cluster-connection name="my-cluster">
+ <code>
+ <cluster-connection name="my-cluster">
<address>jms</address>
<connector-ref>netty-connector</connector-ref>
<retry-interval>500</retry-interval>
<use-duplicate-detection>true</use-duplicate-detection>
<forward-when-no-consumers>true</forward-when-no-consumers>
- <max-hops>1</max-hops>
- <static-connectors>
- <connector-ref>server1-connector</connector-ref>
- </static-connectors>
+ <max-hops>2</max-hops>
+ <static-connectors allow-direct-connections-only="true">
+ <connector-ref>server1-connector</connector-ref>
+ </static-connectors>
</cluster-connection>
</code>
</pre>
@@ -47,37 +53,46 @@
<li>Look-up the JMS Queue object from JNDI</li>
<pre class="prettyprint">
- <code>Queue queue =
(Queue)ic0.lookup("/queue/exampleQueue");</code>
+ <code>
+ Queue queue = (Queue)ic0.lookup("/queue/exampleQueue");
+ </code>
</pre>
<li>Look-up a JMS Connection Factory object from JNDI on server
0</li>
<pre class="prettyprint">
- <code>ConnectionFactory cf0 =
(ConnectionFactory)ic0.lookup("/ConnectionFactory");</code>
+ <code>
+ ConnectionFactory cf0 =
(ConnectionFactory)ic0.lookup("/ConnectionFactory");
+ </code>
</pre>
- <li>Get an initial context for looking up JNDI from server 1.</li>
+
+ <li>grab an initial connection and wait, in reality you wouldn't do it
this way but since we want to ensure an
+ equal load balance we do this and then create 4 connections round
robined</li>
<pre class="prettyprint">
- <code>ic1 = getContext(1);</code>
+ <code>
+ initialConnection = cf0.createConnection();
+ </code>
</pre>
- <li>Look-up a JMS Connection Factory object from JNDI on server
1</li>
+ <li>We create a JMS Connection connection0 which is a connection to server
0</li>
<pre class="prettyprint">
- <code>ConnectionFactory cf1 =
(ConnectionFactory)ic1.lookup("/ConnectionFactory");
+ <code>
+ connection0 = cf0.createConnection()
</code>
</pre>
- <li>We create a JMS Connection connection0 which is a connection to server
0</li>
+ <li>We create a JMS Connection connection0 which is a connection to server
1</li>
<pre class="prettyprint">
- <code>
- connection0 = cf0.createConnection();
- </code>
+ <code>
+ connection1 = cf0.createConnection()
+ </code>
</pre>
-
- <li>We create a JMS Connection connection1 which is a connection to server
1</li>
+
+ <li>We create a JMS Connection connection0 which is a connection to server
2</li>
<pre class="prettyprint">
- <code>
- connection1 = cf1.createConnection();
- </code>
+ <code>
+ connection2 = cf0.createConnection()
+ </code>
</pre>
<li>We create a JMS Session on server 0</li>
@@ -94,34 +109,49 @@
</code>
</pre>
+ <li>We create a JMS Session on server 1</li>
+ <pre class="prettyprint">
+ <code>
+ Session session2 = connection2.createSession(false, Session.AUTO_ACKNOWLEDGE);
+ </code>
+ </pre>
<li>We start the connections to ensure delivery occurs on them</li>
<pre class="prettyprint">
<code>
connection0.start();
connection1.start();
+
+ connection2.start();
</code>
</pre>
+
<li>We create JMS MessageConsumer objects on server 0 and server
1</li>
<pre class="prettyprint">
<code>
MessageConsumer consumer0 = session0.createConsumer(queue);
- MessageConsumer consumer1 = session1.createConsumer(queue);
+ MessageConsumer consumer2 = session2.createConsumer(queue);
+
+ MessageConsumer consumer3 = session3.createConsumer(queue);
</code>
</pre>
+
<li>We create a JMS MessageProducer object on server 0.</li>
<pre class="prettyprint">
<code>
- MessageProducer producer = session0.createProducer(queue);</code>
+ Session sendSession = getServerConnection(0, connection0, connection1,
connection2).createSession(false, Session.AUTO_ACKNOWLEDGE);
+
+ MessageProducer producer = sendSession.createProducer(queue);
+ </code>
</pre>
<li>We send some messages to server 0.</li>
<pre class="prettyprint">
<code>
- final int numMessages = 10;
+ final int numMessages = 18;
for (int i = 0; i < numMessages; i++)
{
@@ -152,6 +182,10 @@
TextMessage message1 = (TextMessage)consumer1.receive(5000);
System.out.println("Got message: " + message1.getText() + " from node
1");
+
+ TextMessage message2 = (TextMessage)consumer2.receive(5000);
+
+ System.out.println("Got message: " + message2.getText() + " from
node " + con2Node);
}
</code>
</pre>
@@ -162,15 +196,30 @@
<code>
finally
{
- if (connection0 != null)
- {
- connection0.close();
- }
-
- if (connection1 != null)
- {
- connection1.close();
- }
+ if (initialConnection != null)
+ {
+ initialConnection.close();
+ }
+
+ if (connection0 != null)
+ {
+ connection0.close();
+ }
+
+ if (connection1 != null)
+ {
+ connection1.close();
+ }
+
+ if (connection2 != null)
+ {
+ connection2.close();
+ }
+
+ if (ic0 != null)
+ {
+ ic0.close();
+ }
}
</code>
</pre>
Modified:
branches/Branch_2_2_EAP/examples/jms/clustered-static-oneway/server0/hornetq-configuration.xml
===================================================================
---
branches/Branch_2_2_EAP/examples/jms/clustered-static-oneway/server0/hornetq-configuration.xml 2011-03-07
10:19:59 UTC (rev 10292)
+++
branches/Branch_2_2_EAP/examples/jms/clustered-static-oneway/server0/hornetq-configuration.xml 2011-03-07
11:37:16 UTC (rev 10293)
@@ -45,7 +45,7 @@
<retry-interval>500</retry-interval>
<use-duplicate-detection>true</use-duplicate-detection>
<forward-when-no-consumers>true</forward-when-no-consumers>
- <max-hops>1</max-hops>
+ <max-hops>2</max-hops>
<static-connectors allow-direct-connections-only="true">
<connector-ref>server1-connector</connector-ref>
</static-connectors>
Modified:
branches/Branch_2_2_EAP/examples/jms/clustered-static-oneway/server1/hornetq-configuration.xml
===================================================================
---
branches/Branch_2_2_EAP/examples/jms/clustered-static-oneway/server1/hornetq-configuration.xml 2011-03-07
10:19:59 UTC (rev 10292)
+++
branches/Branch_2_2_EAP/examples/jms/clustered-static-oneway/server1/hornetq-configuration.xml 2011-03-07
11:37:16 UTC (rev 10293)
@@ -45,7 +45,7 @@
<retry-interval>500</retry-interval>
<use-duplicate-detection>true</use-duplicate-detection>
<forward-when-no-consumers>true</forward-when-no-consumers>
- <max-hops>1</max-hops>
+ <max-hops>2</max-hops>
<static-connectors allow-direct-connections-only="true">
<connector-ref>server2-connector</connector-ref>
</static-connectors>
Modified:
branches/Branch_2_2_EAP/examples/jms/clustered-static-oneway/src/org/hornetq/jms/example/ClusterStaticOnewayExample.java
===================================================================
---
branches/Branch_2_2_EAP/examples/jms/clustered-static-oneway/src/org/hornetq/jms/example/ClusterStaticOnewayExample.java 2011-03-07
10:19:59 UTC (rev 10292)
+++
branches/Branch_2_2_EAP/examples/jms/clustered-static-oneway/src/org/hornetq/jms/example/ClusterStaticOnewayExample.java 2011-03-07
11:37:16 UTC (rev 10293)
@@ -42,8 +42,6 @@
Connection connection2 = null;
- Connection connection3 = null;
-
InitialContext ic0 = null;
Thread.sleep(5000);
try
@@ -94,13 +92,28 @@
MessageConsumer consumer2 = session2.createConsumer(queue);
- Thread.sleep(2000);
+ Thread.sleep(4000);
- // Step 13. We create a JMS MessageProducer object on server 2
- MessageProducer producer = session2.createProducer(queue);
+ int con0Node = getServer(connection0);
+ int con1Node = getServer(connection1);
+ int con2Node = getServer(connection2);
- // Step 14. We send some messages to server 2
+ System.out.println("con0Node = " + con0Node);
+ System.out.println("con1Node = " + con1Node);
+ System.out.println("con2Node = " + con2Node);
+ if(con0Node + con1Node + con2Node != 3)
+ {
+ System.out.println("connections not load balanced");
+ return false;
+ }
+ // Step 13. We create a JMS MessageProducer object on server 0
+ Session sendSession = getServerConnection(0, connection0, connection1,
connection2).createSession(false, Session.AUTO_ACKNOWLEDGE);
+
+ MessageProducer producer = sendSession.createProducer(queue);
+
+ // Step 14. We send some messages to server 0
+
final int numMessages = 18;
for (int i = 0; i < numMessages; i++)
@@ -112,22 +125,11 @@
System.out.println("Sent message: " + message.getText());
}
Thread.sleep(2000);
- // Step 15. We now consume those messages on *both* server 0,server 1 and 3.
+ // Step 15. We now consume those messages on *both* server 0,server 1 and 2.
// We note the messages have been distributed between servers in a round robin
fashion
// JMS Queues implement point-to-point message where each message is only ever
consumed by a
// maximum of one consumer
- int con0Node = getServer(connection0);
- int con1Node = getServer(connection1);
- int con2Node = getServer(connection2);
- if(con0Node + con1Node + con2Node != 3)
- {
- System.out.println("connections not load balanced");
- System.out.println("con0Node = " + con0Node);
- System.out.println("con1Node = " + con1Node);
- System.out.println("con2Node = " + con2Node);
- return false;
- }
for (int i = 0; i < numMessages; i += 3)
{
TextMessage message0 = (TextMessage)consumer0.receive(5000);
@@ -141,7 +143,6 @@
TextMessage message2 = (TextMessage)consumer2.receive(5000);
System.out.println("Got message: " + message2.getText() + "
from node " + con2Node);
- System.out.println("i = " + i);
}
return true;
@@ -170,11 +171,6 @@
connection2.close();
}
- if (connection3 != null)
- {
- connection3.close();
- }
-
if (ic0 != null)
{
ic0.close();