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 <div class="subTitle">org.apache.river.mercury</div>
 <h2 title="Interface EventLog" class="title">Interface EventLog</h2>
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 <dt>All Known Implementing Classes:</dt>
 <dd><a href="../../../../org/apache/river/mercury/PersistentEventLog.html" title="class in org.apache.river.mercury">PersistentEventLog</a>, <a href="../../../../org/apache/river/mercury/TransientEventLog.html" title="class in org.apache.river.mercury">TransientEventLog</a></dd>
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 <br>
 <pre>interface <span class="typeNameLabel">EventLog</span></pre>
 <div class="block">Interface implemented by event storage objects.
  This class encapsulates the details of reading/writing events from/to
  some underlying persistence mechanism.

  This interface makes certain assumptions. First, the <tt>next</tt> and
  <tt>remove</tt> methods are intended to be called in pairs. If
  <tt>remove</tt> is not called, then subsequent calls to <tt>next</tt>
  will attempt to return the same object. Calling <tt>remove</tt>
  essentially advances the read pointer to the next object, if any.
  Second, if any <tt>IOExceptions</tt> are encountered during the reading
  or writing of an event the associated read/write pointer is advanced
  past the offending event. This means that events can be lost if I/O
  errors are encountered.</div>
 <dl>
 <dt><span class="simpleTagLabel">Since:</span></dt>
 <dd>1.1</dd>
 <dt><span class="simpleTagLabel">Author:</span></dt>
 <dd>Sun Microsystems, Inc.</dd>
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 <h3>Method Summary</h3>
 <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation">
 <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd">&nbsp;</span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t3" class="tableTab"><span><a href="javascript:show(4);">Abstract Methods</a></span><span class="tabEnd">&nbsp;</span></span></caption>
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 <th class="colFirst" scope="col">Modifier and Type</th>
 <th class="colLast" scope="col">Method and Description</th>
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 <tr id="i0" class="altColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/river/mercury/EventLog.html#add-net.jini.core.event.RemoteEvent-">add</a></span>(<a href="../../../../net/jini/core/event/RemoteEvent.html" title="class in net.jini.core.event">RemoteEvent</a>&nbsp;event)</code>
 <div class="block">Writes the given <tt>RemoteEvent</tt> to the underlying
  storage mechanism, if possible.</div>
 </td>
 </tr>
 <tr id="i1" class="rowColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/river/mercury/EventLog.html#close--">close</a></span>()</code>
 <div class="block">Close this log and release any associated runtime resources.</div>
 </td>
 </tr>
 <tr id="i2" class="altColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/river/mercury/EventLog.html#delete--">delete</a></span>()</code>
 <div class="block">Delete associated storage resources for this log.</div>
 </td>
 </tr>
 <tr id="i3" class="rowColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/river/mercury/EventLog.html#init--">init</a></span>()</code>
 <div class="block">Initializes the state of this <tt>EventLog</tt> object.</div>
 </td>
 </tr>
 <tr id="i4" class="altColor">
 <td class="colFirst"><code>boolean</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/river/mercury/EventLog.html#isEmpty--">isEmpty</a></span>()</code>
 <div class="block">Returns <tt>true</tt> if this log contains no events and
  false otherwise.</div>
 </td>
 </tr>
 <tr id="i5" class="rowColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/river/mercury/EventLog.html#moveAhead-java.lang.Object-">moveAhead</a></span>(<a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&nbsp;cookie)</code>
 <div class="block">Effectively removes the last set of read events from the log.</div>
 </td>
 </tr>
 <tr id="i6" class="altColor">
 <td class="colFirst"><code><a href="../../../../net/jini/core/event/RemoteEvent.html" title="class in net.jini.core.event">RemoteEvent</a></code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/river/mercury/EventLog.html#next--">next</a></span>()</code>
 <div class="block">Return the next <tt>RemoteEvent</tt> to be read.</div>
 </td>
 </tr>
 <tr id="i7" class="rowColor">
 <td class="colFirst"><code><a href="../../../../org/apache/river/mercury/RemoteEventData.html" title="class in org.apache.river.mercury">RemoteEventData</a>[]</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/river/mercury/EventLog.html#readAhead-int-">readAhead</a></span>(int&nbsp;maxEvents)</code>
 <div class="block">Return an array of <tt>RemoteEventData</tt> with a limit of
  <tt>maxEvents</tt> elements.</div>
 </td>
 </tr>
 <tr id="i8" class="altColor">
 <td class="colFirst"><code>void</code></td>
 <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/river/mercury/EventLog.html#remove--">remove</a></span>()</code>
 <div class="block">Effectively removes the last read event from the log.</div>
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 <pre>void&nbsp;init()
    throws <a href="http://docs.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
 <div class="block">Initializes the state of this <tt>EventLog</tt> object.
  The required functionality can potentially throw an
  <tt>IOException</tt> and has therefore been separated from
  from object construction.</div>
 <dl>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <dd><code><a href="http://docs.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code> - if an I/O error occurs</dd>
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 <a name="add-net.jini.core.event.RemoteEvent-">
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 <h4>add</h4>
 <pre>void&nbsp;add(<a href="../../../../net/jini/core/event/RemoteEvent.html" title="class in net.jini.core.event">RemoteEvent</a>&nbsp;event)
   throws <a href="http://docs.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
 <div class="block">Writes the given <tt>RemoteEvent</tt> to the underlying
  storage mechanism, if possible. If an <tt>IOException</tt>
  occurs, then the write cannot be guaranteed.</div>
 <dl>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <dd><code><a href="http://docs.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code> - if an I/O error occurs</dd>
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 <h4>next</h4>
 <pre><a href="../../../../net/jini/core/event/RemoteEvent.html" title="class in net.jini.core.event">RemoteEvent</a>&nbsp;next()
           throws <a href="http://docs.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a>,
                  <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/ClassNotFoundException.html?is-external=true" title="class or interface in java.lang">ClassNotFoundException</a></pre>
 <div class="block">Return the next <tt>RemoteEvent</tt> to be read. Note that
  <tt>next</tt> is meant to be used in conjunction with
  <tt>remove</tt>. Subsequent calls to <tt>next</tt> will
  return the same event until <tt>remove</tt> is called, which
  actually updates the read pointer to the next event (indicating
  that the previously read event was successfully processed).</div>
 <dl>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <dd><code><a href="http://docs.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code> - if an I/O error occurs</dd>
 <dd><code><a href="http://docs.oracle.com/javase/6/docs/api/java/lang/ClassNotFoundException.html?is-external=true" title="class or interface in java.lang">ClassNotFoundException</a></code> - if a class for the serialized
                 object could not be found</dd>
 <dd><code><a href="http://docs.oracle.com/javase/6/docs/api/java/util/NoSuchElementException.html?is-external=true" title="class or interface in java.util">NoSuchElementException</a></code> - if no event is available</dd>
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 <pre>boolean&nbsp;isEmpty()
          throws <a href="http://docs.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
 <div class="block">Returns <tt>true</tt> if this log contains no events and
  false otherwise.</div>
 <dl>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <dd><code><a href="http://docs.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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 <h4>remove</h4>
 <pre>void&nbsp;remove()
      throws <a href="http://docs.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
 <div class="block">Effectively removes the last read event from the log.
  It does this by advancing the read pointer to the
  next available event, if any.</div>
 <dl>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <dd><code><a href="http://docs.oracle.com/javase/6/docs/api/java/util/NoSuchElementException.html?is-external=true" title="class or interface in java.util">NoSuchElementException</a></code> - if no events are available</dd>
 <dd><code><a href="http://docs.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
 </dl>
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 <!--   -->
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 <h4>readAhead</h4>
 <pre><a href="../../../../org/apache/river/mercury/RemoteEventData.html" title="class in org.apache.river.mercury">RemoteEventData</a>[]&nbsp;readAhead(int&nbsp;maxEvents)
                      throws <a href="http://docs.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a>,
                             <a href="http://docs.oracle.com/javase/6/docs/api/java/lang/ClassNotFoundException.html?is-external=true" title="class or interface in java.lang">ClassNotFoundException</a></pre>
 <div class="block">Return an array of <tt>RemoteEventData</tt> with a limit of
  <tt>maxEvents</tt> elements. Note that
  <tt>readAhead</tt> is meant to be used in conjunction with
  <tt>moveAhead</tt>. Subsequent calls to <tt>readAhead</tt> with
  the same argument value will return the same set of events until
  <tt>moveAhead</tt> is called, which
  actually updates the read pointer to the next unread event (indicating
  that the previously read events were successfully processed).</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>maxEvents</code> - maximum number of events/elements to return</dd>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <dd><code><a href="http://docs.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code> - if an I/O error occurs</dd>
 <dd><code><a href="http://docs.oracle.com/javase/6/docs/api/java/lang/ClassNotFoundException.html?is-external=true" title="class or interface in java.lang">ClassNotFoundException</a></code> - if a class for the serialized
                 object could not be found</dd>
 <dd><code><a href="http://docs.oracle.com/javase/6/docs/api/java/util/NoSuchElementException.html?is-external=true" title="class or interface in java.util">NoSuchElementException</a></code> - if no event is available</dd>
 </dl>
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 <a name="moveAhead-java.lang.Object-">
 <!--   -->
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 <h4>moveAhead</h4>
 <pre>void&nbsp;moveAhead(<a href="http://docs.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a>&nbsp;cookie)
         throws <a href="http://docs.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
 <div class="block">Effectively removes the last set of read events from the log.
  It does this by advancing the read pointer to the
  next available event after the event associated with the provided
  cookie object.</div>
 <dl>
 <dt><span class="paramLabel">Parameters:</span></dt>
 <dd><code>cookie</code> - object associated with event to read past. This object
  should have been obtained from a call to
  <code>getCookie()</code> on a <code>RemoteEventData</code> object
  obtained from a call to <code>readAhead</code> on this event log.</dd>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <dd><code><a href="http://docs.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code> - if there was a problem advancing the read pointer.</dd>
 <dd><code><a href="http://docs.oracle.com/javase/6/docs/api/java/lang/NullPointerException.html?is-external=true" title="class or interface in java.lang">NullPointerException</a></code> - if <code>cookie</code> is null.</dd>
 <dd><code><a href="http://docs.oracle.com/javase/6/docs/api/java/lang/ClassCastException.html?is-external=true" title="class or interface in java.lang">ClassCastException</a></code> - if <code>cookie</code>
  is not an expected type.</dd>
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 <pre>void&nbsp;close()
     throws <a href="http://docs.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
 <div class="block">Close this log and release any associated runtime resources.</div>
 <dl>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <dd><code><a href="http://docs.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd>
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 <pre>void&nbsp;delete()
      throws <a href="http://docs.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre>
 <div class="block">Delete associated storage resources for this log.</div>
 <dl>
 <dt><span class="throwsLabel">Throws:</span></dt>
 <dd><code><a href="http://docs.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code> - if an IO error occurs</dd>
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