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MqttClientPersistence (MQTT v3 Client API)
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org.eclipse.paho.client.mqttv3</FONT>
<BR>
Interface MqttClientPersistence</H2>
<DL>
<DT><B>All Known Implementing Classes:</B> <DD><A HREF="../../../../../org/eclipse/paho/client/mqttv3/MqttDefaultFilePersistence.html" title="class in org.eclipse.paho.client.mqttv3">MqttDefaultFilePersistence</A></DD>
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<DT>public interface <B>MqttClientPersistence</B></DL>

<P>
Represents a persistent data store, used to store outbound and inbound messages while they
 are in flight, enabling delivery to the QOS specified. You can specify an implementation
 of this interface using <A HREF="../../../../../org/eclipse/paho/client/mqttv3/MqttClient.html#MqttClient(java.lang.String, java.lang.String, org.eclipse.paho.client.mqttv3.MqttClientPersistence)"><CODE>MqttClient.MqttClient(String, String, MqttClientPersistence)</CODE></A>,
 which the <A HREF="../../../../../org/eclipse/paho/client/mqttv3/MqttClient.html" title="class in org.eclipse.paho.client.mqttv3"><CODE>MqttClient</CODE></A> will use to persist QoS 1 and 2 messages.
 <p>
 If the methods defined throw the MqttPersistenceException then the state of the data persisted
 should remain as prior to the method being called. For example, if <A HREF="../../../../../org/eclipse/paho/client/mqttv3/MqttClientPersistence.html#put(java.lang.String, org.eclipse.paho.client.mqttv3.MqttPersistable)"><CODE>put(String, MqttPersistable)</CODE></A>
 throws an exception at any point then the data will be assumed to not be in the persistent store.
 Similarly if <A HREF="../../../../../org/eclipse/paho/client/mqttv3/MqttClientPersistence.html#remove(java.lang.String)"><CODE>remove(String)</CODE></A> throws an exception then the data will be
 assumed to still be held in the persistent store.</p>
 <p>
 It is up to the persistence interface to log any exceptions or error information 
 which may be required when diagnosing a persistence failure.</p>
<P>

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<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/eclipse/paho/client/mqttv3/MqttClientPersistence.html#clear()">clear</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Clears persistence, so that it no longer contains any persisted data.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/eclipse/paho/client/mqttv3/MqttClientPersistence.html#close()">close</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Close the persistent store that was previously opened.
 </TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/eclipse/paho/client/mqttv3/MqttClientPersistence.html#containsKey(java.lang.String)">containsKey</A></B>(java.lang.String&nbsp;key)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns whether or not data is persisted using the specified key.</TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;<A HREF="../../../../../org/eclipse/paho/client/mqttv3/MqttPersistable.html" title="interface in org.eclipse.paho.client.mqttv3">MqttPersistable</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/eclipse/paho/client/mqttv3/MqttClientPersistence.html#get(java.lang.String)">get</A></B>(java.lang.String&nbsp;key)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Gets the specified data out of the persistent store.</TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;java.util.Enumeration</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/eclipse/paho/client/mqttv3/MqttClientPersistence.html#keys()">keys</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns an Enumeration over the keys in this persistent data store.</TD>
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<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/eclipse/paho/client/mqttv3/MqttClientPersistence.html#open(java.lang.String, java.lang.String)">open</A></B>(java.lang.String&nbsp;clientId,
     java.lang.String&nbsp;serverURI)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Initialise the persistent store.
 </TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/eclipse/paho/client/mqttv3/MqttClientPersistence.html#put(java.lang.String, org.eclipse.paho.client.mqttv3.MqttPersistable)">put</A></B>(java.lang.String&nbsp;key,
    <A HREF="../../../../../org/eclipse/paho/client/mqttv3/MqttPersistable.html" title="interface in org.eclipse.paho.client.mqttv3">MqttPersistable</A>&nbsp;persistable)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Puts the specified data into the persistent store.</TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../org/eclipse/paho/client/mqttv3/MqttClientPersistence.html#remove(java.lang.String)">remove</A></B>(java.lang.String&nbsp;key)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Remove the data for the specified key.</TD>
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<A NAME="open(java.lang.String, java.lang.String)"><!-- --></A><H3>
open</H3>
<PRE>
public void <B>open</B>(java.lang.String&nbsp;clientId,
                 java.lang.String&nbsp;serverURI)
          throws <A HREF="../../../../../org/eclipse/paho/client/mqttv3/MqttPersistenceException.html" title="class in org.eclipse.paho.client.mqttv3">MqttPersistenceException</A></PRE>
<DL>
<DD>Initialise the persistent store.
 If a persistent store exists for this client ID then open it, otherwise 
 create a new one. If the persistent store is already open then just return.
 An application may use the same client ID to connect to many different 
 servers, so the client ID in conjunction with the
 connection will uniquely identify the persistence store required.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>clientId</CODE> - The client for which the persistent store should be opened.<DD><CODE>serverURI</CODE> - The connection string as specified when the MQTT client instance was created.
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../../org/eclipse/paho/client/mqttv3/MqttPersistenceException.html" title="class in org.eclipse.paho.client.mqttv3">MqttPersistenceException</A></CODE> - if there was a problem opening the persistent store.</DL>
</DD>
</DL>
<HR>

<A NAME="close()"><!-- --></A><H3>
close</H3>
<PRE>
public void <B>close</B>()
           throws <A HREF="../../../../../org/eclipse/paho/client/mqttv3/MqttPersistenceException.html" title="class in org.eclipse.paho.client.mqttv3">MqttPersistenceException</A></PRE>
<DL>
<DD>Close the persistent store that was previously opened.
 This will be called when a client application disconnects from the broker.
<P>
<DD><DL>

<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../../org/eclipse/paho/client/mqttv3/MqttPersistenceException.html" title="class in org.eclipse.paho.client.mqttv3">MqttPersistenceException</A></CODE></DL>
</DD>
</DL>
<HR>

<A NAME="put(java.lang.String, org.eclipse.paho.client.mqttv3.MqttPersistable)"><!-- --></A><H3>
put</H3>
<PRE>
public void <B>put</B>(java.lang.String&nbsp;key,
                <A HREF="../../../../../org/eclipse/paho/client/mqttv3/MqttPersistable.html" title="interface in org.eclipse.paho.client.mqttv3">MqttPersistable</A>&nbsp;persistable)
         throws <A HREF="../../../../../org/eclipse/paho/client/mqttv3/MqttPersistenceException.html" title="class in org.eclipse.paho.client.mqttv3">MqttPersistenceException</A></PRE>
<DL>
<DD>Puts the specified data into the persistent store.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>key</CODE> - the key for the data, which will be used later to retrieve it.<DD><CODE>persistable</CODE> - the data to persist
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../../org/eclipse/paho/client/mqttv3/MqttPersistenceException.html" title="class in org.eclipse.paho.client.mqttv3">MqttPersistenceException</A></CODE> - if there was a problem putting the data
 into the persistent store.</DL>
</DD>
</DL>
<HR>

<A NAME="get(java.lang.String)"><!-- --></A><H3>
get</H3>
<PRE>
public <A HREF="../../../../../org/eclipse/paho/client/mqttv3/MqttPersistable.html" title="interface in org.eclipse.paho.client.mqttv3">MqttPersistable</A> <B>get</B>(java.lang.String&nbsp;key)
                    throws <A HREF="../../../../../org/eclipse/paho/client/mqttv3/MqttPersistenceException.html" title="class in org.eclipse.paho.client.mqttv3">MqttPersistenceException</A></PRE>
<DL>
<DD>Gets the specified data out of the persistent store.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>key</CODE> - the key for the data, which was used when originally saving it.
<DT><B>Returns:</B><DD>the un-persisted data
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../../org/eclipse/paho/client/mqttv3/MqttPersistenceException.html" title="class in org.eclipse.paho.client.mqttv3">MqttPersistenceException</A></CODE> - if there was a problem getting the data
 from the persistent store.</DL>
</DD>
</DL>
<HR>

<A NAME="remove(java.lang.String)"><!-- --></A><H3>
remove</H3>
<PRE>
public void <B>remove</B>(java.lang.String&nbsp;key)
            throws <A HREF="../../../../../org/eclipse/paho/client/mqttv3/MqttPersistenceException.html" title="class in org.eclipse.paho.client.mqttv3">MqttPersistenceException</A></PRE>
<DL>
<DD>Remove the data for the specified key.
<P>
<DD><DL>

<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../../org/eclipse/paho/client/mqttv3/MqttPersistenceException.html" title="class in org.eclipse.paho.client.mqttv3">MqttPersistenceException</A></CODE></DL>
</DD>
</DL>
<HR>

<A NAME="keys()"><!-- --></A><H3>
keys</H3>
<PRE>
public java.util.Enumeration <B>keys</B>()
                           throws <A HREF="../../../../../org/eclipse/paho/client/mqttv3/MqttPersistenceException.html" title="class in org.eclipse.paho.client.mqttv3">MqttPersistenceException</A></PRE>
<DL>
<DD>Returns an Enumeration over the keys in this persistent data store.
<P>
<DD><DL>

<DT><B>Returns:</B><DD>an enumeration of <CODE>String</CODE> objects.
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../../org/eclipse/paho/client/mqttv3/MqttPersistenceException.html" title="class in org.eclipse.paho.client.mqttv3">MqttPersistenceException</A></CODE></DL>
</DD>
</DL>
<HR>

<A NAME="clear()"><!-- --></A><H3>
clear</H3>
<PRE>
public void <B>clear</B>()
           throws <A HREF="../../../../../org/eclipse/paho/client/mqttv3/MqttPersistenceException.html" title="class in org.eclipse.paho.client.mqttv3">MqttPersistenceException</A></PRE>
<DL>
<DD>Clears persistence, so that it no longer contains any persisted data.
<P>
<DD><DL>

<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../../org/eclipse/paho/client/mqttv3/MqttPersistenceException.html" title="class in org.eclipse.paho.client.mqttv3">MqttPersistenceException</A></CODE></DL>
</DD>
</DL>
<HR>

<A NAME="containsKey(java.lang.String)"><!-- --></A><H3>
containsKey</H3>
<PRE>
public boolean <B>containsKey</B>(java.lang.String&nbsp;key)
                    throws <A HREF="../../../../../org/eclipse/paho/client/mqttv3/MqttPersistenceException.html" title="class in org.eclipse.paho.client.mqttv3">MqttPersistenceException</A></PRE>
<DL>
<DD>Returns whether or not data is persisted using the specified key.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>key</CODE> - the key for data, which was used when originally saving it.
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../../org/eclipse/paho/client/mqttv3/MqttPersistenceException.html" title="class in org.eclipse.paho.client.mqttv3">MqttPersistenceException</A></CODE></DL>
</DD>
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