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Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements. See the NOTICE file
distributed with this work for additional information
regarding copyright ownership. The ASF licenses this file
to you under the Apache License, Version 2.0 (the
"License"); you may not use this file except in compliance
with the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing,
software distributed under the License is distributed on an
"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
KIND, either express or implied. See the License for the
specific language governing permissions and limitations
under the License.
-->
<chapter id="Java-Broker-Management-Managing-Entities">
<title>Managing Entities</title>
<para>This section describes how to manage entities within the Broker. The principles underlying
entity management are the same regardless of entity type. For this reason, this section begins
with a general description that applies to all.</para>
<para>Since not all channels support the management of all entity type, this section commences
with a table showing which entity type is supported by each channel.</para>
<section id="Java-Broker-Management-Managing-Entities-General">
<title>General Description</title>
<para>The following description applies to all entities within the Broker regardless of their
type.</para>
<para>
<itemizedlist>
<listitem>
<para>All entities have a parent, and may have children. The parent of the Broker is
called the System Context. It has no parent.</para>
</listitem>
<listitem>
<para>Entities have one or more attributes. For example a <literal>name</literal>, an
<literal>id</literal> or a <literal>maximumQueueDepth</literal></para>
</listitem>
<listitem>
<para>Entities can be durable or non-durable. Durable entities survive a restart.
Non-durable entities will not.</para>
</listitem>
<listitem>
<para>Attributes may have a default value. If an attribute value is not specified the
default value is used.</para>
</listitem>
<listitem>
<para>Attributes values can be expressed as a simple value (e.g. <literal>myName</literal>
or <literal>1234</literal>), in terms of context variables
(e.g.<literal>${foo}</literal> or <literal>/data/${foo}/</literal>).</para>
</listitem>
<listitem>
<para>Each entity has zero or more context variables.</para>
</listitem>
<listitem>
<para>The System Context entity (the ultimate ancestor of all object) has a context too.
It is read only and is populated with all Java System Properties. Thus it can be
influenced from the Broker's external environment. See <link
linkend="Java-Broker-Appendix-Environment-Variables-Qpid-Opts">QPID_OPTS </link>
environment variable.</para>
</listitem>
<listitem>
<para>When resolving an attribute's value, if the value contains a variable
(e.g.<literal>${foo}</literal>), the variable is first resolved using the entity's own
context variables. If the entity has no definition for the context variable, the
entity's parent is tried, then its grandparent and so forth, all the way until the
SystemContext is reached.</para>
</listitem>
<listitem>
<para>Some entities support state and have a lifecycle.</para>
</listitem>
</itemizedlist>
</para>
<para>What follows now is a section dedicated to each entity type. For each entity type key
features are described along with the entities key attributes, key context variables, details
of the entities lifecycle and any other operations.</para>
</section>
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</chapter>
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