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+ <h1>
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+ <a href="." >Apache Karaf</a>
+ </h1>
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+
+ <h1 id="artemis-on-apache-karaf">Artemis on Apache Karaf</h1>
+<p>Apache ActiveMQ Artemis is OSGi ready. Below you can find instruction on how to install and configure broker on Apache Karaf OSGi container.</p>
+<h2 id="installation">Installation</h2>
+<p>Apache ActiveMQ Artemis provides features that makes it easy to install the broker on Apache Karaf (4.x or later). First you need to define the feature URL, like </p>
+<pre><code class="lang-sh">karaf@root()> feature:repo-add mvn:org.apache.activemq/artemis-features/1.3.0-SNAPSHOT/xml/features
+</code></pre>
+<p>This will add Artemis related features </p>
+<pre><code>karaf@root()> feature:list | grep artemis
+artemis | 1.3.0.SNAPSHOT | | Uninstalled | artemis-1.3.0-SNAPSHOT | Full ActiveMQ Artemis broker with default configuration
+netty-core | 4.0.32.Final | | Uninstalled | artemis-1.3.0-SNAPSHOT | Netty libraries
+artemis-core | 1.3.0.SNAPSHOT | | Uninstalled | artemis-1.3.0-SNAPSHOT | ActiveMQ Artemis broker libraries
+artemis-amqp | 1.3.0.SNAPSHOT | | Uninstalled | artemis-1.3.0-SNAPSHOT | ActiveMQ Artemis AMQP protocol libraries
+artemis-stomp | 1.3.0.SNAPSHOT | | Uninstalled | artemis-1.3.0-SNAPSHOT | ActiveMQ Artemis Stomp protocol libraries
+artemis-mqtt | 1.3.0.SNAPSHOT | | Uninstalled | artemis-1.3.0-SNAPSHOT | ActiveMQ Artemis MQTT protocol libraries
+artemis-hornetq | 1.3.0.SNAPSHOT | | Uninstalled | artemis-1.3.0-SNAPSHOT | ActiveMQ Artemis HornetQ protocol libraries
+</code></pre><p>Feature named <code>artemis</code> contains full broker installation, so running </p>
+<pre><code>feature:install artemis
+</code></pre><p>will install and run the broker.</p>
+<h2 id="configuration">Configuration</h2>
+<p>The broker is installed as <code>org.apache.activemq.artemis</code> OSGi component, so it's configured through <code>${KARAF_BASE}/etc/org.apache.activemq.artemis.cfg</code> file. An example of the file looks like</p>
+<pre><code>config=file:etc/artemis.xml
+name=local
+domain=karaf
+rolePrincipalClass=org.apache.karaf.jaas.boot.principal.RolePrincipal
+</code></pre><table>
+<thead>
+<tr>
+<th>Name</th>
+<th>Description</th>
+<th>Default value</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td>config</td>
+<td>Location of the configuration file</td>
+<td>${KARAF_BASE}/etc/artemis.xml</td>
+</tr>
+<tr>
+<td>name</td>
+<td>Name of the broker</td>
+<td>local</td>
+</tr>
+<tr>
+<td>domain</td>
+<td>JAAS domain to use for security</td>
+<td>karaf</td>
+</tr>
+<tr>
+<td>rolePrincipalClass</td>
+<td>Class name used for role authorization purposes</td>
+<td>org.apache.karaf.jaas.boot.principal.RolePrincipal</td>
+</tr>
+</tbody>
+</table>
+<p>The default broker configuration file is located in <code>${KARAF_BASE}/etc/artemis.xml</code> </p>
+
+
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==============================================================================
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@@ -0,0 +1,1268 @@
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+ <h1>
+ <i class="fa fa-circle-o-notch fa-spin"></i>
+ <a href="." >Large Messages</a>
+ </h1>
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+
+ <h1 id="large-messages">Large Messages</h1>
+<p>Apache ActiveMQ Artemis supports sending and receiving of huge messages, even when the
+client and server are running with limited memory. The only realistic
+limit to the size of a message that can be sent or consumed is the
+amount of disk space you have available. We have tested sending and
+consuming messages up to 8 GiB in size with a client and server running
+in just 50MiB of RAM!</p>
+<p>To send a large message, the user can set an <code>InputStream</code> on a message
+body, and when that message is sent, Apache ActiveMQ Artemis will read the
+<code>InputStream</code>. A <code>FileInputStream</code> could be used for example to send a
+huge message from a huge file on disk.</p>
+<p>As the <code>InputStream</code> is read the data is sent to the server as a stream
+of fragments. The server persists these fragments to disk as it receives
+them and when the time comes to deliver them to a consumer they are read
+back of the disk, also in fragments and sent down the wire. When the
+consumer receives a large message it initially receives just the message
+with an empty body, it can then set an <code>OutputStream</code> on the message to
+stream the huge message body to a file on disk or elsewhere. At no time
+is the entire message body stored fully in memory, either on the client
+or the server.</p>
+<h2 id="configuring-the-server">Configuring the server</h2>
+<p>Large messages are stored on a disk directory on the server side, as
+configured on the main configuration file.</p>
+<p>The configuration property <code>large-messages-directory</code> specifies where
+large messages are stored. For JDBC persistence the <code>large-message-table</code>
+should be configured.</p>
+<pre><code><configuration xmlns="urn:activemq"
+ xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+ xsi:schemaLocation="urn:activemq /schema/artemis-server.xsd">
+...
+<large-messages-directory>/data/large-messages</large-messages-directory>
+...
+</configuration
+</code></pre><p>By default the large message directory is <code>data/largemessages</code> and <code>large-message-table</code> is
+configured as "LARGE_MESSAGE_TABLE".</p>
+<p>For the best performance we recommend using file store with large messages directory stored
+on a different physical volume to the message journal or paging directory.</p>
+<h2 id="configuring-parameters">Configuring Parameters</h2>
+<p>Any message larger than a certain size is considered a large message.
+Large messages will be split up and sent in fragments. This is
+determined by the URL parameter <code>minLargeMessageSize</code></p>
+<blockquote>
+<p><strong>Note</strong></p>
+<p>Apache ActiveMQ Artemis messages are encoded using 2 bytes per character so if the
+message data is filled with ASCII characters (which are 1 byte) the
+size of the resulting Apache ActiveMQ Artemis message would roughly double. This is
+important when calculating the size of a "large" message as it may
+appear to be less than the <code>minLargeMessageSize</code> before it is sent,
+but it then turns into a "large" message once it is encoded.</p>
+</blockquote>
+<p>The default value is 100KiB.</p>
+<p><a href="configuring-transports.html">Configuring the transport directly from the client side</a>
+will provide more information on how to instantiate the core session factory
+or JMS connection factory.</p>
+<h3 id="compressed-large-messages">Compressed Large Messages</h3>
+<p>You can choose to send large messages in compressed form using
+<code>compressLargeMessages</code> URL parameter.</p>
+<h4 id="compresslargemessages"><code>compressLargeMessages</code></h4>
+<p>If you specify the boolean URL parameter <code>compressLargeMessages</code> as true,
+The system will use the ZIP algorithm to compress the message body as
+the message is transferred to the server's side. Notice that there's no
+special treatment at the server's side, all the compressing and uncompressing
+is done at the client.</p>
+<p>If the compressed size of a large message is below <code>minLargeMessageSize</code>,
+it is sent to server as regular messages. This means that the message won't
+be written into the server's large-message data directory, thus reducing the
+disk I/O.</p>
+<h2 id="streaming-large-messages">Streaming large messages</h2>
+<p>Apache ActiveMQ Artemis supports setting the body of messages using input and output
+streams (<code>java.lang.io</code>)</p>
+<p>These streams are then used directly for sending (input streams) and
+receiving (output streams) messages.</p>
+<p>When receiving messages there are 2 ways to deal with the output stream;
+you may choose to block while the output stream is recovered using the
+method <code>ClientMessage.saveOutputStream</code> or alternatively using the
+method <code>ClientMessage.setOutputstream</code> which will asynchronously write
+the message to the stream. If you choose the latter the consumer must be
+kept alive until the message has been fully received.</p>
+<p>You can use any kind of stream you like. The most common use case is to
+send files stored in your disk, but you could also send things like JDBC
+Blobs, <code>SocketInputStream</code>, things you recovered from <code>HTTPRequests</code>
+etc. Anything as long as it implements <code>java.io.InputStream</code> for sending
+messages or <code>java.io.OutputStream</code> for receiving them.</p>
+<h3 id="streaming-over-core-api">Streaming over Core API</h3>
+<p>The following table shows a list of methods available at <code>ClientMessage</code>
+which are also available through JMS by the use of object properties.</p>
+<table summary="org.hornetq.api.core.client.ClientMessage API" border="1">
+ <colgroup>
+ <col>
+ <col>
+ <col>
+ <col>
+ </colgroup>
+ <thead>
+ <tr>
+ <th>Name</th>
+ <th>Description</th>
+ <th>JMS Equivalent</th>
+ </tr>
+ </thead>
+ <tbody>
+ <tr>
+ <td>setBodyInputStream(InputStream)</td>
+ <td>Set the InputStream used to read a message body when sending it.</td>
+ <td>JMS_AMQ_InputStream</td>
+ </tr>
+ <tr>
+ <td>setOutputStream(OutputStream)</td>
+ <td>Set the OutputStream that will receive the body of a message. This method does not block.</td>
+ <td>JMS_AMQ_OutputStream</td>
+ </tr>
+ <tr>
+ <td>saveOutputStream(OutputStream)</td>
+ <td>Save the body of the message to the `OutputStream`. It will block until the entire content is transferred to the `OutputStream`.</td>
+ <td>JMS_AMQ_SaveStream</td>
+ </tr>
+ </tbody>
+</table>
+
+<p>To set the output stream when receiving a core message:</p>
+<pre><code class="lang-java">ClientMessage msg = consumer.receive(...);
+
+
+<span class="hljs-comment">// This will block here until the stream was transferred</span>
+msg.saveOutputStream(someOutputStream);
+
+ClientMessage msg2 = consumer.receive(...);
+
+<span class="hljs-comment">// This will not wait the transfer to finish</span>
+msg2.setOutputStream(someOtherOutputStream);
+</code></pre>
+<p>Set the input stream when sending a core message:</p>
+<pre><code class="lang-java">ClientMessage msg = session.createMessage();
+msg.setInputStream(dataInputStream);
+</code></pre>
+<p>Notice also that for messages with more than 2GiB the getBodySize() will
+return invalid values since this is an integer (which is also exposed to
+the JMS API). On those cases you can use the message property
+_AMQ_LARGE_SIZE.</p>
+<h3 id="streaming-over-jms">Streaming over JMS</h3>
+<p>When using JMS, Apache ActiveMQ Artemis maps the streaming methods on the core API (see
+ClientMessage API table above) by setting object properties . You can use the method
+<code>Message.setObjectProperty</code> to set the input and output streams.</p>
+<p>The <code>InputStream</code> can be defined through the JMS Object Property
+JMS_AMQ_InputStream on messages being sent:</p>
+<pre><code class="lang-java">BytesMessage message = session.createBytesMessage();
+
+FileInputStream fileInputStream = <span class="hljs-keyword">new</span> FileInputStream(fileInput);
+
+BufferedInputStream bufferedInput = <span class="hljs-keyword">new</span> BufferedInputStream(fileInputStream);
+
+message.setObjectProperty(<span class="hljs-string">"JMS_AMQ_InputStream"</span>, bufferedInput);
+
+someProducer.send(message);
+</code></pre>
+<p>The <code>OutputStream</code> can be set through the JMS Object Property
+JMS_AMQ_SaveStream on messages being received in a blocking way.</p>
+<pre><code class="lang-java">BytesMessage messageReceived = (BytesMessage)messageConsumer.receive(<span class="hljs-number">120000</span>);
+
+File outputFile = <span class="hljs-keyword">new</span> File(<span class="hljs-string">"huge_message_received.dat"</span>);
+
+FileOutputStream fileOutputStream = <span class="hljs-keyword">new</span> FileOutputStream(outputFile);
+
+BufferedOutputStream bufferedOutput = <span class="hljs-keyword">new</span> BufferedOutputStream(fileOutputStream);
+
+<span class="hljs-comment">// This will block until the entire content is saved on disk</span>
+messageReceived.setObjectProperty(<span class="hljs-string">"JMS_AMQ_SaveStream"</span>, bufferedOutput);
+</code></pre>
+<p>Setting the <code>OutputStream</code> could also be done in a non blocking way
+using the property JMS_AMQ_OutputStream.</p>
+<pre><code class="lang-java"><span class="hljs-comment">// This won't wait the stream to finish. You need to keep the consumer active.</span>
+messageReceived.setObjectProperty(<span class="hljs-string">"JMS_AMQ_OutputStream"</span>, bufferedOutput);
+</code></pre>
+<blockquote>
+<p><strong>Note</strong></p>
+<p>When using JMS, Streaming large messages are only supported on
+<code>StreamMessage</code> and <code>BytesMessage</code>.</p>
+</blockquote>
+<h2 id="streaming-alternative">Streaming Alternative</h2>
+<p>If you choose not to use the <code>InputStream</code> or <code>OutputStream</code> capability
+of Apache ActiveMQ Artemis You could still access the data directly in an alternative
+fashion.</p>
+<p>On the Core API just get the bytes of the body as you normally would.</p>
+<pre><code class="lang-java">ClientMessage msg = consumer.receive();
+
+<span class="hljs-keyword">byte</span>[] bytes = <span class="hljs-keyword">new</span> <span class="hljs-keyword">byte</span>[<span class="hljs-number">1024</span>];
+<span class="hljs-keyword">for</span> (<span class="hljs-keyword">int</span> i = <span class="hljs-number">0</span> ; i < msg.getBodySize(); i += bytes.length)
+{
+ msg.getBody().readBytes(bytes);
+ <span class="hljs-comment">// Whatever you want to do with the bytes</span>
+}
+</code></pre>
+<p>If using JMS API, <code>BytesMessage</code> and <code>StreamMessage</code> also supports it
+transparently.</p>
+<pre><code class="lang-java">BytesMessage rm = (BytesMessage)cons.receive(<span class="hljs-number">10000</span>);
+
+<span class="hljs-keyword">byte</span> data[] = <span class="hljs-keyword">new</span> <span class="hljs-keyword">byte</span>[<span class="hljs-number">1024</span>];
+
+<span class="hljs-keyword">for</span> (<span class="hljs-keyword">int</span> i = <span class="hljs-number">0</span>; i < rm.getBodyLength(); i += <span class="hljs-number">1024</span>)
+{
+ <span class="hljs-keyword">int</span> numberOfBytes = rm.readBytes(data);
+ <span class="hljs-comment">// Do whatever you want with the data</span>
+}
+</code></pre>
+<h2 id="large-message-example">Large message example</h2>
+<p>Please see the <a href="examples.html">examples</a> chapter for an example which shows
+how large message is configured and used with JMS.</p>
+
+
+ </section>
+
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