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<div class="subTitle">org.apache.ignite.configuration</div>
<h2 title="Enum DeploymentMode" class="title">Enum DeploymentMode</h2>
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<li><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</a></li>
<li>
<ul class="inheritance">
<li><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Enum.html?is-external=true" title="class or interface in java.lang">java.lang.Enum</a>&lt;<a href="../../../../org/apache/ignite/configuration/DeploymentMode.html" title="enum in org.apache.ignite.configuration">DeploymentMode</a>&gt;</li>
<li>
<ul class="inheritance">
<li>org.apache.ignite.configuration.DeploymentMode</li>
</ul>
</li>
</ul>
</li>
</ul>
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<dl>
<dt>All Implemented Interfaces:</dt>
<dd><a href="http://docs.oracle.com/javase/7/docs/api/java/io/Serializable.html?is-external=true" title="class or interface in java.io">Serializable</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Comparable.html?is-external=true" title="class or interface in java.lang">Comparable</a>&lt;<a href="../../../../org/apache/ignite/configuration/DeploymentMode.html" title="enum in org.apache.ignite.configuration">DeploymentMode</a>&gt;</dd>
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<pre>public enum <span class="strong">DeploymentMode</span>
extends <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Enum.html?is-external=true" title="class or interface in java.lang">Enum</a>&lt;<a href="../../../../org/apache/ignite/configuration/DeploymentMode.html" title="enum in org.apache.ignite.configuration">DeploymentMode</a>&gt;</pre>
<div class="block">Grid deployment mode. Deployment mode is specified at grid startup via
<a href="../../../../org/apache/ignite/configuration/IgniteConfiguration.html#getDeploymentMode()"><code>IgniteConfiguration.getDeploymentMode()</code></a> configuration property
(it can also be specified in Spring XML configuration file). The main
difference between all deployment modes is how classes are loaded on remote nodes via peer-class-loading mechanism.
<p>
The following deployment modes are supported:
<ul>
<li><a href="../../../../org/apache/ignite/configuration/DeploymentMode.html#PRIVATE"><code>PRIVATE</code></a></li>
<li><a href="../../../../org/apache/ignite/configuration/DeploymentMode.html#ISOLATED"><code>ISOLATED</code></a></li>
<li><a href="../../../../org/apache/ignite/configuration/DeploymentMode.html#SHARED"><code>SHARED</code></a></li>
<li><a href="../../../../org/apache/ignite/configuration/DeploymentMode.html#CONTINUOUS"><code>CONTINUOUS</code></a></li>
</ul>
<h1 class="header">User Version</h1>
User version comes into play whenever you would like to redeploy tasks deployed
in <a href="../../../../org/apache/ignite/configuration/DeploymentMode.html#SHARED"><code>SHARED</code></a> or <a href="../../../../org/apache/ignite/configuration/DeploymentMode.html#CONTINUOUS"><code>CONTINUOUS</code></a> modes. By default, Ignite will
automatically detect if class-loader changed or a node is restarted. However,
if you would like to change and redeploy code on a subset of nodes, or in
case of <a href="../../../../org/apache/ignite/configuration/DeploymentMode.html#CONTINUOUS"><code>CONTINUOUS</code></a> mode to kill the ever living deployment, you should
change the user version.
<p>
User version is specified in <code>META-INF/ignite.xml</code> file as follows:
<pre name="code" class="xml">
&lt;!-- User version. --&gt;
&lt;bean id="userVersion" class="java.lang.String"&gt;
&lt;constructor-arg value="0"/&gt;
&lt;/bean>
</pre>
By default, all ignite startup scripts (<code>ignite.sh</code> or <code>ignite.bat</code>)
pick up user version from <code>IGNITE_HOME/config/userversion</code> folder. Usually, it
is just enough to update user version under that folder, however, in case of <code>GAR</code>
or <code>JAR</code> deployment, you should remember to provide <code>META-INF/ignite.xml</code>
file with desired user version in it.
<p>
<h1 class="header">Always-Local Development</h1>
Ignite deployment (regardless of mode) allows you to develop everything as you would
locally. You never need to specifically write any kind of code for remote nodes. For
example, if you need to use a distributed cache from your <a href="../../../../org/apache/ignite/compute/ComputeJob.html" title="interface in org.apache.ignite.compute"><code>ComputeJob</code></a>, then you can
the following:
<ol>
<li>
Simply startup stand-alone Ignite nodes by executing
<code>IGNITE_HOME/ignite.{sh|bat}</code> scripts.
</li>
<li>
Now, all jobs executing locally or remotely can have a single instance of cache
on every node, and all jobs can access instances stored by any other job without
any need for explicit deployment.
</li>
</ol></div>
</li>
</ul>
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<table class="overviewSummary" border="0" cellpadding="3" cellspacing="0" summary="Enum Constant Summary table, listing enum constants, and an explanation">
<caption><span>Enum Constants</span><span class="tabEnd">&nbsp;</span></caption>
<tr>
<th class="colOne" scope="col">Enum Constant and Description</th>
</tr>
<tr class="altColor">
<td class="colOne"><code><strong><a href="../../../../org/apache/ignite/configuration/DeploymentMode.html#CONTINUOUS">CONTINUOUS</a></strong></code>
<div class="block">Same as <a href="../../../../org/apache/ignite/configuration/DeploymentMode.html#SHARED"><code>SHARED</code></a> deployment mode, but resources will not be undeployed even after all master
nodes left grid.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><code><strong><a href="../../../../org/apache/ignite/configuration/DeploymentMode.html#ISOLATED">ISOLATED</a></strong></code>
<div class="block">Unlike <a href="../../../../org/apache/ignite/configuration/DeploymentMode.html#PRIVATE"><code>PRIVATE</code></a> mode, where different deployed tasks will
never use the same instance of resources, in <code>ISOLATED</code>
mode, tasks or classes deployed within the same class loader
will share the same instances of resources.</div>
</td>
</tr>
<tr class="altColor">
<td class="colOne"><code><strong><a href="../../../../org/apache/ignite/configuration/DeploymentMode.html#PRIVATE">PRIVATE</a></strong></code>
<div class="block">In this mode deployed classes do not share resources.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><code><strong><a href="../../../../org/apache/ignite/configuration/DeploymentMode.html#SHARED">SHARED</a></strong></code>
<div class="block">Same as <a href="../../../../org/apache/ignite/configuration/DeploymentMode.html#ISOLATED"><code>ISOLATED</code></a>, but now tasks from
different master nodes with the same user version and same
class loader will share the same class loader on remote
nodes.</div>
</td>
</tr>
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<caption><span>Methods</span><span class="tabEnd">&nbsp;</span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static <a href="../../../../org/apache/ignite/configuration/DeploymentMode.html" title="enum in org.apache.ignite.configuration">DeploymentMode</a></code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/ignite/configuration/DeploymentMode.html#fromOrdinal(int)">fromOrdinal</a></strong>(int&nbsp;ord)</code>
<div class="block">Efficiently gets enumerated value from its ordinal.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static <a href="../../../../org/apache/ignite/configuration/DeploymentMode.html" title="enum in org.apache.ignite.configuration">DeploymentMode</a></code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/ignite/configuration/DeploymentMode.html#valueOf(java.lang.String)">valueOf</a></strong>(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;name)</code>
<div class="block">Returns the enum constant of this type with the specified name.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static <a href="../../../../org/apache/ignite/configuration/DeploymentMode.html" title="enum in org.apache.ignite.configuration">DeploymentMode</a>[]</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/ignite/configuration/DeploymentMode.html#values()">values</a></strong>()</code>
<div class="block">Returns an array containing the constants of this enum type, in
the order they are declared.</div>
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<code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Enum.html?is-external=true#clone()" title="class or interface in java.lang">clone</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Enum.html?is-external=true#compareTo(E)" title="class or interface in java.lang">compareTo</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Enum.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang">equals</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Enum.html?is-external=true#finalize()" title="class or interface in java.lang">finalize</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Enum.html?is-external=true#getDeclaringClass()" title="class or interface in java.lang">getDeclaringClass</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Enum.html?is-external=true#hashCode()" title="class or interface in java.lang">hashCode</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Enum.html?is-external=true#name()" title="class or interface in java.lang">name</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Enum.html?is-external=true#ordinal()" title="class or interface in java.lang">ordinal</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Enum.html?is-external=true#toString()" title="class or interface in java.lang">toString</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Enum.html?is-external=true#valueOf(java.lang.Class,%20java.lang.String)" title="class or interface in java.lang">valueOf</a></code></li>
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<h3>Methods inherited from class&nbsp;java.lang.<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></h3>
<code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang">getClass</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang">notify</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang">notifyAll</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang">wait</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang">wait</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait(long,%20int)" title="class or interface in java.lang">wait</a></code></li>
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<div class="details">
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<h4>PRIVATE</h4>
<pre>public static final&nbsp;<a href="../../../../org/apache/ignite/configuration/DeploymentMode.html" title="enum in org.apache.ignite.configuration">DeploymentMode</a> PRIVATE</pre>
<div class="block">In this mode deployed classes do not share resources. Basically, resources are created
once per deployed task class and then get reused for all executions.
<p>
Note that classes deployed within the same class loader on master
node, will still share the same class loader remotely on worker nodes.
However, tasks deployed from different master nodes will not
share the same class loader on worker nodes, which is useful in
development when different developers can be working on different
versions of the same classes.
<p>
Also note that resources are associated with task deployment,
not task execution. If the same deployed task gets executed multiple
times, then it will keep reusing the same user resources
every time.</div>
</li>
</ul>
<a name="ISOLATED">
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<h4>ISOLATED</h4>
<pre>public static final&nbsp;<a href="../../../../org/apache/ignite/configuration/DeploymentMode.html" title="enum in org.apache.ignite.configuration">DeploymentMode</a> ISOLATED</pre>
<div class="block">Unlike <a href="../../../../org/apache/ignite/configuration/DeploymentMode.html#PRIVATE"><code>PRIVATE</code></a> mode, where different deployed tasks will
never use the same instance of resources, in <code>ISOLATED</code>
mode, tasks or classes deployed within the same class loader
will share the same instances of resources.
This means that if multiple tasks classes are loaded by the same
class loader on master node, then they will share instances
of resources on worker nodes. In other words, user resources
get initialized once per class loader and then get reused for all
consecutive executions.
<p>
Note that classes deployed within the same class loader on master
node, will still share the same class loader remotely on worker nodes.
However, tasks deployed from different master nodes will not
share the same class loader on worker nodes, which is especially
useful when different developers can be working on different versions
of the same classes.</div>
</li>
</ul>
<a name="SHARED">
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<h4>SHARED</h4>
<pre>public static final&nbsp;<a href="../../../../org/apache/ignite/configuration/DeploymentMode.html" title="enum in org.apache.ignite.configuration">DeploymentMode</a> SHARED</pre>
<div class="block">Same as <a href="../../../../org/apache/ignite/configuration/DeploymentMode.html#ISOLATED"><code>ISOLATED</code></a>, but now tasks from
different master nodes with the same user version and same
class loader will share the same class loader on remote
nodes. Classes will be undeployed whenever all master
nodes leave grid or user version changes.
<p>
The advantage of this approach is that it allows tasks coming from
different master nodes share the same instances of resources on worker nodes. This allows for all
tasks executing on remote nodes to reuse, for example, the same instances of
connection pools or caches. When using this mode, you can
startup multiple stand-alone Ignite worker nodes, define resources
on master nodes and have them initialize once on worker nodes regardless
of which master node they came from.
<p>
This method is specifically useful in production as, in comparison
to <a href="../../../../org/apache/ignite/configuration/DeploymentMode.html#ISOLATED"><code>ISOLATED</code></a> deployment mode, which has a scope of single
class loader on a single master node, this mode broadens the
deployment scope to all master nodes.
<p>
Note that classes deployed in this mode will be undeployed if
all master nodes left grid or if user version changed. User version can
be specified in <code>META-INF/ignite.xml</code> file as a Spring bean
property with name <code>userVersion</code>. This file has to be in the class
path of the class used for task execution.
<p>
<code>SHARED</code> deployment mode is default mode used by the grid.</div>
</li>
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<h4>CONTINUOUS</h4>
<pre>public static final&nbsp;<a href="../../../../org/apache/ignite/configuration/DeploymentMode.html" title="enum in org.apache.ignite.configuration">DeploymentMode</a> CONTINUOUS</pre>
<div class="block">Same as <a href="../../../../org/apache/ignite/configuration/DeploymentMode.html#SHARED"><code>SHARED</code></a> deployment mode, but resources will not be undeployed even after all master
nodes left grid. Tasks from different master nodes with the same user
version and same class loader will share the same class loader on remote
worker nodes. Classes will be undeployed whenever user version changes.
<p>
The advantage of this approach is that it allows tasks coming from
different master nodes share the same instances of resources on worker nodes. This allows for all
tasks executing on remote nodes to reuse, for example, the same instances of
connection pools or caches. When using this mode, you can
startup multiple stand-alone Ignite worker nodes, define resources
on master nodes and have them initialize once on worker nodes regardless
of which master node they came from.
<p>
This method is specifically useful in production as, in comparison
to <a href="../../../../org/apache/ignite/configuration/DeploymentMode.html#ISOLATED"><code>ISOLATED</code></a> deployment mode, which has a scope of single
class loader on a single master node, <tt>CONTINUOUS</tt> mode broadens
the deployment scope to all master nodes.
<p>
Note that classes deployed in <tt>CONTINUOUS</tt> mode will be undeployed
only if user version changes. User version can be specified in
<code>META-INF/ignite.xml</code> file as a Spring bean property with name
<code>userVersion</code>. This file has to be in the class
path of the class used for task execution.</div>
</li>
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</li>
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<a name="values()">
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<h4>values</h4>
<pre>public static&nbsp;<a href="../../../../org/apache/ignite/configuration/DeploymentMode.html" title="enum in org.apache.ignite.configuration">DeploymentMode</a>[]&nbsp;values()</pre>
<div class="block">Returns an array containing the constants of this enum type, in
the order they are declared. This method may be used to iterate
over the constants as follows:
<pre>
for (DeploymentMode c : DeploymentMode.values())
&nbsp; System.out.println(c);
</pre></div>
<dl><dt><span class="strong">Returns:</span></dt><dd>an array containing the constants of this enum type, in the order they are declared</dd></dl>
</li>
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<h4>valueOf</h4>
<pre>public static&nbsp;<a href="../../../../org/apache/ignite/configuration/DeploymentMode.html" title="enum in org.apache.ignite.configuration">DeploymentMode</a>&nbsp;valueOf(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a>&nbsp;name)</pre>
<div class="block">Returns the enum constant of this type with the specified name.
The string must match <i>exactly</i> an identifier used to declare an
enum constant in this type. (Extraneous whitespace characters are
not permitted.)</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>name</code> - the name of the enum constant to be returned.</dd>
<dt><span class="strong">Returns:</span></dt><dd>the enum constant with the specified name</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang">IllegalArgumentException</a></code> - if this enum type has no constant with the specified name</dd>
<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/NullPointerException.html?is-external=true" title="class or interface in java.lang">NullPointerException</a></code> - if the argument is null</dd></dl>
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<h4>fromOrdinal</h4>
<pre>@Nullable
public static&nbsp;<a href="../../../../org/apache/ignite/configuration/DeploymentMode.html" title="enum in org.apache.ignite.configuration">DeploymentMode</a>&nbsp;fromOrdinal(int&nbsp;ord)</pre>
<div class="block">Efficiently gets enumerated value from its ordinal.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>ord</code> - Ordinal value.</dd>
<dt><span class="strong">Returns:</span></dt><dd>Enumerated value.</dd></dl>
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