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<div class="subTitle">org.osgi.service.log</div>
<h2 title="Interface LogReaderService" class="title">Interface LogReaderService</h2>
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<pre>public interface <span class="typeNameLabel">LogReaderService</span></pre>
<div class="block">Provides methods to retrieve <code>LogEntry</code> objects from the log.
<p>
There are two ways to retrieve <code>LogEntry</code> objects:
<ul>
<li>The primary way to retrieve <code>LogEntry</code> objects is to register a
<code>LogListener</code> object whose <code>LogListener.logged</code> method will be
called for each entry added to the log.</li>
<li>To retrieve past <code>LogEntry</code> objects, the <code>getLog</code> method can
be called which will return an <code>Enumeration</code> of all <code>LogEntry</code>
objects in the log.</li>
</ul></div>
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<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../org/osgi/service/log/LogEntry.html" title="interface in org.osgi.service.log"><code>LogEntry</code></a>,
<a href="../../../../org/osgi/service/log/LogListener.html" title="interface in org.osgi.service.log"><code>LogListener</code></a>,
<a href="../../../../org/osgi/service/log/LogListener.html#logged-org.osgi.service.log.LogEntry-"><code>LogListener.logged(LogEntry)</code></a></dd>
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<h3>Method Summary</h3>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/osgi/service/log/LogReaderService.html#addLogListener-org.osgi.service.log.LogListener-">addLogListener</a></span>(<a href="../../../../org/osgi/service/log/LogListener.html" title="interface in org.osgi.service.log">LogListener</a> listener)</code>
<div class="block">Subscribes to <code>LogEntry</code> objects.</div>
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<td class="colFirst"><code>java.util.Enumeration</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/osgi/service/log/LogReaderService.html#getLog--">getLog</a></span>()</code>
<div class="block">Returns an <code>Enumeration</code> of all <code>LogEntry</code> objects in the
log.</div>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/osgi/service/log/LogReaderService.html#removeLogListener-org.osgi.service.log.LogListener-">removeLogListener</a></span>(<a href="../../../../org/osgi/service/log/LogListener.html" title="interface in org.osgi.service.log">LogListener</a> listener)</code>
<div class="block">Unsubscribes to <code>LogEntry</code> objects.</div>
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<h4>addLogListener</h4>
<pre>void addLogListener(<a href="../../../../org/osgi/service/log/LogListener.html" title="interface in org.osgi.service.log">LogListener</a> listener)</pre>
<div class="block">Subscribes to <code>LogEntry</code> objects.
<p>
This method registers a <code>LogListener</code> object with the Log Reader
Service. The <code>LogListener.logged(LogEntry)</code> method will be called
for each <code>LogEntry</code> object placed into the log.
<p>
When a bundle which registers a <code>LogListener</code> object is stopped or
otherwise releases the Log Reader Service, the Log Reader Service must
remove all of the bundle's listeners.
<p>
If this Log Reader Service's list of listeners already contains a
listener <code>l</code> such that <code>(l==listener)</code>, this method does
nothing.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>listener</code> - A <code>LogListener</code> object to register; the
<code>LogListener</code> object is used to receive <code>LogEntry</code>
objects.</dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../org/osgi/service/log/LogListener.html" title="interface in org.osgi.service.log"><code>LogListener</code></a>,
<a href="../../../../org/osgi/service/log/LogEntry.html" title="interface in org.osgi.service.log"><code>LogEntry</code></a>,
<a href="../../../../org/osgi/service/log/LogListener.html#logged-org.osgi.service.log.LogEntry-"><code>LogListener.logged(LogEntry)</code></a></dd>
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<h4>removeLogListener</h4>
<pre>void removeLogListener(<a href="../../../../org/osgi/service/log/LogListener.html" title="interface in org.osgi.service.log">LogListener</a> listener)</pre>
<div class="block">Unsubscribes to <code>LogEntry</code> objects.
<p>
This method unregisters a <code>LogListener</code> object from the Log Reader
Service.
<p>
If <code>listener</code> is not contained in this Log Reader Service's list of
listeners, this method does nothing.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>listener</code> - A <code>LogListener</code> object to unregister.</dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../org/osgi/service/log/LogListener.html" title="interface in org.osgi.service.log"><code>LogListener</code></a></dd>
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<h4>getLog</h4>
<pre>java.util.Enumeration getLog()</pre>
<div class="block">Returns an <code>Enumeration</code> of all <code>LogEntry</code> objects in the
log.
<p>
Each element of the enumeration is a <code>LogEntry</code> object, ordered
with the most recent entry first. Whether the enumeration is of all
<code>LogEntry</code> objects since the Log Service was started or some recent
past is implementation-specific. Also implementation-specific is whether
informational and debug <code>LogEntry</code> objects are included in the
enumeration.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>An <code>Enumeration</code> of all <code>LogEntry</code> objects in the
log.</dd>
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