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<div class="subTitle">org.apache.ignite.igfs</div>
<h2 title="Class IgfsUserContext" class="title">Class IgfsUserContext</h2>
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<pre>public abstract class <span class="strong">IgfsUserContext</span>
extends <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></pre>
<div class="block">Provides ability to execute IGFS code in a context of a specific user.</div>
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<td class="colOne"><code><strong><a href="../../../../org/apache/ignite/igfs/IgfsUserContext.html#IgfsUserContext()">IgfsUserContext</a></strong>()</code>&nbsp;</td>
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<td class="colFirst"><code>static <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></code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/ignite/igfs/IgfsUserContext.html#currentUser()">currentUser</a></strong>()</code>
<div class="block">Gets the current context user.</div>
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<td class="colFirst"><code>static &lt;T&gt;&nbsp;T</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/ignite/igfs/IgfsUserContext.html#doAs(java.lang.String,%20java.util.concurrent.Callable)">doAs</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;user,
<a href="http://docs.oracle.com/javase/7/docs/api/java/util/concurrent/Callable.html?is-external=true" title="class or interface in java.util.concurrent">Callable</a>&lt;T&gt;&nbsp;c)</code>
<div class="block">Same contract that <a href="../../../../org/apache/ignite/igfs/IgfsUserContext.html#doAs(java.lang.String,%20org.apache.ignite.lang.IgniteOutClosure)"><code>doAs(String, IgniteOutClosure)</code></a> has, but accepts
callable that throws checked Exception.</div>
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<td class="colFirst"><code>static &lt;T&gt;&nbsp;T</code></td>
<td class="colLast"><code><strong><a href="../../../../org/apache/ignite/igfs/IgfsUserContext.html#doAs(java.lang.String,%20org.apache.ignite.lang.IgniteOutClosure)">doAs</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;user,
<a href="../../../../org/apache/ignite/lang/IgniteOutClosure.html" title="interface in org.apache.ignite.lang">IgniteOutClosure</a>&lt;T&gt;&nbsp;c)</code>
<div class="block">Executes given callable in the given user context.</div>
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<code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.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/Object.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/Object.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/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#hashCode()" title="class or interface in java.lang">hashCode</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#toString()" title="class or interface in java.lang">toString</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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<pre>public&nbsp;IgfsUserContext()</pre>
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<h4>doAs</h4>
<pre>public static&nbsp;&lt;T&gt;&nbsp;T&nbsp;doAs(<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;user,
<a href="../../../../org/apache/ignite/lang/IgniteOutClosure.html" title="interface in org.apache.ignite.lang">IgniteOutClosure</a>&lt;T&gt;&nbsp;c)</pre>
<div class="block">Executes given callable in the given user context.
The main contract of this method is that <a href="../../../../org/apache/ignite/igfs/IgfsUserContext.html#currentUser()"><code>currentUser()</code></a> method invoked
inside closure always returns 'user' this callable executed with.</div>
<dl><dt><span class="strong">Type Parameters:</span></dt><dd><code>T</code> - The type of closure result.</dd><dt><span class="strong">Parameters:</span></dt><dd><code>user</code> - the user name to invoke closure on behalf of.</dd><dd><code>c</code> - the closure to execute</dd>
<dt><span class="strong">Returns:</span></dt><dd>the result of closure execution.</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 user name is null or empty String or if the closure is null.</dd></dl>
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<pre>public static&nbsp;&lt;T&gt;&nbsp;T&nbsp;doAs(<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;user,
<a href="http://docs.oracle.com/javase/7/docs/api/java/util/concurrent/Callable.html?is-external=true" title="class or interface in java.util.concurrent">Callable</a>&lt;T&gt;&nbsp;c)
throws <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a></pre>
<div class="block">Same contract that <a href="../../../../org/apache/ignite/igfs/IgfsUserContext.html#doAs(java.lang.String,%20org.apache.ignite.lang.IgniteOutClosure)"><code>doAs(String, IgniteOutClosure)</code></a> has, but accepts
callable that throws checked Exception.
The Exception is not ever wrapped anyhow.
If your Callable throws Some specific checked Exceptions, the recommended usage pattern is:
<pre name="code" class="java">
public Foo myOperation() throws MyCheckedException1, MyCheckedException2 {
try {
return IgfsUserContext.doAs(user, new Callable<Foo>() {
&#64;Override public Foo call() throws MyCheckedException1, MyCheckedException2 {
return makeSomeFoo(); // do the job
}
});
}
catch (MyCheckedException1 | MyCheckedException2 | RuntimeException | Error e) {
throw e;
}
catch (Exception e) {
throw new AssertionError("Must never go there.");
}
}
</pre></div>
<dl><dt><span class="strong">Type Parameters:</span></dt><dd><code>T</code> - The type of callable result.</dd><dt><span class="strong">Parameters:</span></dt><dd><code>user</code> - the user name to invoke closure on behalf of.</dd><dd><code>c</code> - the Callable to execute</dd>
<dt><span class="strong">Returns:</span></dt><dd>the result of closure execution.</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 user name is null or empty String or if the closure is null.</dd>
<dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Exception.html?is-external=true" title="class or interface in java.lang">Exception</a></code></dd></dl>
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<h4>currentUser</h4>
<pre>@Nullable
public static&nbsp;<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;currentUser()</pre>
<div class="block">Gets the current context user.
If this method is invoked outside of any <a href="../../../../org/apache/ignite/igfs/IgfsUserContext.html#doAs(java.lang.String,%20org.apache.ignite.lang.IgniteOutClosure)"><code>doAs(String, IgniteOutClosure)</code></a> on the call stack, it will
return null. Otherwise it will return the user name set in the most lower
<a href="../../../../org/apache/ignite/igfs/IgfsUserContext.html#doAs(java.lang.String,%20org.apache.ignite.lang.IgniteOutClosure)"><code>doAs(String, IgniteOutClosure)</code></a> call on the call stack.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>The current user, may be null.</dd></dl>
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