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Changes to the Spring Data GemFire Reference Guide based on recent improvements and bugs fixes for the Spring Data GemFire 1.3.3 release.

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John Blum
2013-11-12 12:18:00 -08:00
parent ac5527ba52
commit 93ba141e3c
2 changed files with 131 additions and 80 deletions
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67
docs/src/reference/docbook/reference/bootstrap.xml
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@@ -3,7 +3,10 @@
xmlns="http://docbook.org/ns/docbook"
xmlns:xlink="http://www.w3.org/1999/xlink"
xmlns:xi="http://www.w3.org/2001/XInclude"
>
xmlns:ns5="http://www.w3.org/2000/svg"
xmlns:ns4="http://www.w3.org/1998/Math/MathML"
xmlns:ns3="http://www.w3.org/1999/xhtml"
xmlns:ns="http://docbook.org/ns/docbook">
<title>Bootstrapping GemFire through the Spring Container</title>
<para>Spring Data GemFire provides full configuration and initialization of
@@ -25,32 +28,41 @@
<literal>cache.xml</literal></title>
<para xmlns="">As of release 1.2.0, Spring Data GemFire's XML namespace
supports full configuration of the data grid. In fact, the Spring
namespace is considered the preferred way to configure GemFire. GemFire
will continue to support <filename>cache.xml</filename> for legacy
reasons, but you can now do everything in Spring XML and take advantage of
the many wonderful things Spring has to offer such as modular XML
configuration, property placeholders, SpEL, and environment profiles.
Behind the namespace, Spring Data GemFire makes extensive use of Spring's
<interfacename>FactoryBean</interfacename> pattern to simplify the
creation and initialization of GemFire components.</para>
supports full configuration of the data grid. In fact, the Spring Data
GemFire namespace is considered the preferred way to configure GemFire.
GemFire will continue to support native <filename>
<literal xmlns="http://docbook.org/ns/docbook">cache.xml</literal>
</filename> for legacy reasons, but you can now do everything in Spring
XML and take advantage of the many wonderful things Spring has to offer
such as modular XML configuration, property placeholders, SpEL, and
environment profiles. Behind the namespace, Spring Data GemFire makes
extensive use of Spring's <interfacename>FactoryBean</interfacename>
pattern to simplify the creation and initialization of GemFire
components.</para>
<para xmlns=""> For example, GemFire provides several callback interfaces
such as <interfacename>CacheListener</interfacename>,
<interfacename>CacheWriter</interfacename>,
<interfacename>CacheLoader</interfacename> to allow developers to add
custom event handlers. Using the Spring IoC container, these may
configured as normal Spring beans and injected into GemFire components.
This is a significant improvement over cache.xml which provides relatively
limited configuration options and requires callbacks to implement
GemFire's <literal>Declarable</literal> interface (see <xref
linkend="apis:declarable" xmlns="http://docbook.org/ns/docbook"/> to see
how you can still use Declarables within Spring's DI container).</para>
such as <interfacename>
<literal xmlns="http://docbook.org/ns/docbook">CacheListener</literal>
</interfacename>, <interfacename>
<literal xmlns="http://docbook.org/ns/docbook">CacheWriter</literal>
</interfacename>, <interfacename>
<literal xmlns="http://docbook.org/ns/docbook">CacheLoader</literal>
</interfacename> to allow developers to add custom event handlers. Using
the Spring IoC container, these may configured as normal Spring beans and
injected into GemFire components. This is a significant improvement over
native <literal xmlns="http://docbook.org/ns/docbook">cache.xml</literal>
which provides relatively limited configuration options and requires
callbacks to implement GemFire's <literal>
<literal xmlns="http://docbook.org/ns/docbook">Declarable</literal>
</literal> interface (see <xref linkend="apis:declarable"
xmlns="http://docbook.org/ns/docbook"/> to see how you can still use
<literal xmlns="http://docbook.org/ns/docbook">Declarables</literal>
within Spring's DI container).</para>
<para xmlns=""> In addition, IDEs such as the Spring Tool Suite (STS)
provide excellent support for Spring XML namespaces, such as code
completion, pop-up annotations, and real time validation, making them easy
to use. </para>
to use.</para>
</section>
<section id="bootstrap:namespace">
@@ -58,7 +70,7 @@
<para>To simplify configuration, Spring Data GemFire provides a dedicated
XML namespace for configuring core GemFire components. It is also possible
to configure the beans directly through Springs standard &lt;bean&gt;
to configure the beans directly through Spring's standard &lt;bean&gt;
definition. However, as of Spring Data GemFire 1.2.0, all bean properties
are exposed via the namespace so there is little benefit to using raw bean
definitions. For more information about XML Schema-based configuration in
@@ -73,7 +85,7 @@
</note>
<para>To use the Spring Data GemFire namespace, simply declare it in your
Spring XML configuration:</para>
Spring XML configuration meta-data:</para>
<programlisting language="xml">&lt;?xml version="1.0" encoding="UTF-8"?&gt;
&lt;beans xmlns="http://www.springframework.org/schema/beans"
@@ -193,7 +205,10 @@
cache declaration but one can customize it accordingly or use a pool (if
need be) - see the namespace schema for the full set of options.</para>
</section>
<xi:include href="diskstore.xml"/>
<xi:include href="function.xml"/>
<xi:include href="gateway.xml"/>
<xi:include href="diskstore.xml"/>
<xi:include href="function.xml"/>
<xi:include href="gateway.xml"/>
</chapter>

144
docs/src/reference/docbook/reference/region.xml
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@@ -10,9 +10,9 @@
<title>Configuring a GemFire Region</title>
<para xmlns="">A region is required to store and retrieve data from the
cache. <interfacename>Region</interfacename> is an interface extends
<interfacename>java.util.map</interfacename> used to perform basic data
access using familiar key-value semantics. The
cache. <interfacename>Region</interfacename> is an interface extending
<interfacename>java.util.Map</interfacename> and enables basic data access
using familiar key-value semantics. The
<interfacename>Region</interfacename> interface is wired into classes that
require it so the actual region type is decoupled from the programming model
. Typically each region is associated with one domain object, similar to a
@@ -42,11 +42,11 @@
<listitem>
<para><emphasis>Client</emphasis> - Technically a client region is a
local region that acts as a proxy to a replicated or partitioned region
hosted on cache servers. It may hold data created or fetched locally,
alternately it can be empty. Local updates are synchronized to the cache
server. Also, a client region may subscribe to events in order to stay
synchronized with changes originating from remote processes that access
the same region.</para>
hosted on cache servers. It may hold data created or fetched locally.
Alternately, it can be empty. Local updates are synchronized to the
cache server. Also, a client region may subscribe to events in order to
stay synchronized with changes originating from remote processes that
access the same region.</para>
</listitem>
</itemizedlist>
@@ -60,10 +60,10 @@
<section id="bootstrap:region:lookup">
<title>Using an externally configured Region</title>
<para>For referencing Regions already configured through GemFire native
<para>For referencing regions already configured through GemFire native
configuration, e.g., a <literal>cache.xml</literal> file, use the
<literal>lookup-region</literal> element. Simply declare the target region
name with the<literal> name</literal> attribute; for example to declare a
name with the<literal> name</literal> attribute; for example, to declare a
bean definition, named <literal>region-bean</literal> for an existing
region named <literal>orders</literal> one can use the following
definition:</para>
@@ -161,7 +161,8 @@
<entry>close</entry>
<entry spanname="values">
<emphasis>boolean, default:false (Note: The default was true prior to 1.3.0)</emphasis>
<emphasis>boolean, default:false (Note: The default was true
prior to 1.3.0)</emphasis>
</entry>
<entry spanname="description">Indicates whether the region
@@ -358,7 +359,7 @@
using the <literal>cache-listener</literal> element enclosed in a
<literal>*-region</literal> element. In the example below, there are two
<interfacename>CacheListener</interfacename>s declared. The first
references a top level named Spring bean; the second is an anonymous
references a top-level named Spring bean; the second is an anonymous
inner bean definition. <programlisting language="xml">
&lt;gfe:replicated-region id="region-with-listeners"&gt;
&lt;gfe:cache-listener&gt;
@@ -370,7 +371,7 @@
&lt;bean id="c-listener" class="some.pkg.SimpleCacheListener"/&gt;
&lt;/gfe:replicated-region&gt;
</programlisting> The following example uses an alternate form of the
</programlisting>The following example uses an alternate form of the
<literal>cache-listener</literal> element with a <literal>ref</literal>
attribute. This allows for more concise configuration for a single cache
listener. Note that the namespace only allows a single
@@ -418,9 +419,9 @@
<literal>cache-writer</literal> elements to register these respective
components for a region. A <interfacename>CacheLoader</interfacename> is
invoked on a cache miss to allow an entry to be loaded from an external
source, a database for example. A
<interfacename>CacheWriter</interfacename> is invoked afer an entry is
created or updated,intended for synchronizing to an external data
data source, a database for example. A
<interfacename>CacheWriter</interfacename> is invoked after an entry is
created or updated, intended for synchronizing to an external data
source. The difference is GemFire only supports at most a single
instance of each for each region. However, either declaration style may
be used. See <ulink
@@ -475,7 +476,7 @@
region. This allows data to be recovered after a machine or process
failure or after an orderly shutdown and restart of GemFire.</para>
<para>With Spring Data GemFire, to enable persistence, simply set the
<para>To enable persistence with Spring Data GemFire, simply set the
<literal>persistent</literal> attribute to true:</para>
<programlisting language="xml">&lt;gfe:partitioned-region id="persitent-partition" persistent="true"/&gt;</programlisting>
@@ -486,6 +487,21 @@
initialization exception.</para>
</important>
<para>Persistence may also be configured using the
<literal>data-policy</literal> attribute, set to one of <link
linkend="https://www.vmware.com/support/developer/vfabric-gemfire/700-api/com/gemstone/gemfire/cache/DataPolicy.html">GemFire's
data policy settings</link>. For instance...</para>
<para>
<programlisting language="xml">&lt;gfe:partitioned-region id="persitent-partition" data-policy="PERSISTENT_PARTITION"/&gt;</programlisting>
</para>
<para>The data policy must match the region type and must also agree with
the <literal>persistent</literal> attribute if explicitly set. An
initialization exception will be thrown if, for instance, the
<literal>persistent</literal> attribute is set to false, yet a persistent
data policy was specified.</para>
<para>When persisting regions, it is recommended to configure the storage
through the <literal>disk-store</literal> element for maximum efficiency.
The diskstore is referenced using the disk-store-ref attribute.
@@ -497,24 +513,28 @@
<para>This is discussed further in <xref
linkend="bootstrap-diskstore"/></para>
</section>
<section id="bootstrap:region:subscription">
<section id="bootstrap:region:subscription">
<title>Subscription Interest Policy</title>
<para>GemFire allows configuration of subscriptions to control <ulink url="http://pubs.vmware.com//vfabricNoSuite/topic/com.vmware.vfabric.gemfire.7.0/developing/events/configure_p2p_event_messaging.html">peer to peer event handling</ulink>.
Spring Data GemFire provides a <tag>&lt;gfe:subscription/&gt;</tag> to set the interest policy on replicated and partitioned regions to either <literal>ALL</literal> or <literal>CACHE_CONTENT</literal>.
</para>
<para>GemFire allows configuration of subscriptions to control <ulink
url="http://pubs.vmware.com//vfabricNoSuite/topic/com.vmware.vfabric.gemfire.7.0/developing/events/configure_p2p_event_messaging.html">peer
to peer event handling</ulink>. Spring Data GemFire provides a
<tag>&lt;gfe:subscription/&gt;</tag> to set the interest policy on
replicated and partitioned regions to either <literal>ALL</literal> or
<literal>CACHE_CONTENT</literal>.</para>
<programlisting language="xml">&lt;gfe:partitioned-region id="subscription-partition"&gt;
&lt;gfe:subscription type="CACHE_CONTENT"/&gt;
&lt;/gfe:partitioned-region&gt;</programlisting>
</section>
<section id="bootstrap:region:eviction">
<title>Data Eviction and Overflowing</title>
<para>Based on various constraints, each region can have an eviction
policy in place for <literal>evicting</literal> data from memory.
Currently, in GemFire eviction applies to the least recently used entry
(also known as <ulink
policy in place for evicting data from memory. Currently, in GemFire,
eviction applies to the least recently used entry (also known as <ulink
url="http://en.wikipedia.org/wiki/Cache_algorithms#Least_Recently_Used">LRU</ulink>).
Evicted entries are either destroyed or paged to disk (also known as
<emphasis>overflow</emphasis>).</para>
@@ -537,9 +557,9 @@
information.</para>
</important>
<para>When configuring regions for oveflow, it is recommended to configure
the storage through the <literal>disk-store</literal> element for maximum
efficiency.</para>
<para>When configuring regions for overflow, it is recommended to
configure the storage through the <literal>disk-store</literal> element
for maximum efficiency.</para>
<para>For a detailed description of eviction policies, see the GemFire
documentation (such as <ulink
@@ -569,8 +589,8 @@
The idle timeout counter for a region is reset whenever the idle
timeout is reset for one of its entries.</para>
</listitem>
</itemizedlist> <para> Each of these may be applied to the region itself
or entries in the region. Spring Data GemFire provides
</itemizedlist><para> Each of these may be applied to the region itself or
entries in the region. Spring Data GemFire provides
<literal>&lt;region-ttl&gt;</literal>,
<literal>&lt;region-tti&gt;</literal>, <literal>&lt;entry-ttl&gt;</literal>
and <literal>&lt;entry-tti&gt;</literal> region child elements to specify
@@ -619,7 +639,7 @@
<title>Partitioned Region</title>
<para>Another region type supported out of the box by the Spring Data
GemFire namespace, is the partitioned region. To quote the GemFire
GemFire namespace is the partitioned region. To quote the GemFire
docs:</para>
<para>"A partitioned region is a region where data is divided between peer
@@ -790,7 +810,7 @@ and a nested resolver declaration --&gt;
client region while the latter defines connection pools to be used/shared
by the various client regions.</para>
<para>Below is a typical client region configuration:G</para>
<para>Below is a typical client region configuration:</para>
<programlisting language="xml">&lt;!-- client region using the default client-cache pool --&gt;
&lt;gfe:client-region id="simple"&gt;
@@ -810,8 +830,9 @@ and a nested resolver declaration --&gt;
&lt;/gfe:pool&gt;</programlisting>
<para>As with the other region types, <literal>client-region</literal>
supports <interfacename>CacheListener</interfacename>s (but not
CacheLoaders or CacheWriters). It also requires a connection
supports <interfacename>CacheListener</interfacename><literal>s</literal>
as well as a single <literal>CacheLoader</literal> or
<literal>CacheWriter</literal>. It also requires a connection
<literal>pool</literal> for connecting to a server. Each client can have
its own pool or they can share the same one.</para>
@@ -860,28 +881,43 @@ and a nested resolver declaration --&gt;
<title>JSON Support</title>
<para>Gemfire 7.0 introduced support for caching JSON documents with OQL
query support. These are stored internally as <ulink url="http://www.vmware.com/support/developer/vfabric-gemfire/700-api/com/gemstone/gemfire/pdx/PdxInstance.html">PdxInstance</ulink> types using the
<ulink url="http://www.vmware.com/support/developer/vfabric-gemfire/700-api/com/gemstone/gemfire/pdx/JSONFormatter.html">JSONFormatter</ulink> to perform conversion to and from JSON strings. Spring Data
GemFire provides a <tag>&lt;gfe-data:json-region-autoproxy/&gt;</tag> tag to enable a
<ulink url="http://static.springsource.org/spring/docs/current/spring-framework-reference/htmlsingle/#aop-introduction">Spring AOP</ulink> component to advise appropropriate region operations, effectively
encapsulating the JSONFormatter, allowing your application to work directly
with JSON strings. In addition, Java objects written to JSON configured regions will
be automatically converted to JSON using the Jackson ObjectMapper. Reading these values will return a JSON string.
</para>
<para>
By default, <tag>&lt;gfe-data:json-region-autoproxy/&gt;</tag> will perform the conversion on all regions. To apply this feature to selected regions, provide a comma delimited list of
their ids via the <literal>region-refs</literal> attribute. Other attributes include a
<literal>pretty-print</literal> flag (false by default) and <literal>convert-returned-collections</literal>. By default the results of region
operations getAll() and values() will be converted for configured
regions. This is done by creating a parallel structure in local memory. This can incur significant overhead for large collections. Set this
flag to false to disable automatic conversion for these operation.
<note>Certain region operations, specifically those that use GemFire's proprietary Region.Entry such as entries(boolean), entrySet(boolean) and getEntry()
type are not targeted for AOP advice. In addition, the entrySet() method which returns a Set&lt;java.util.Map.Entry&lt;?,?&gt;&gt; is not affected.</note>
</para>
<programlisting language="xml">
query support. These are stored internally as <ulink
url="http://www.vmware.com/support/developer/vfabric-gemfire/700-api/com/gemstone/gemfire/pdx/PdxInstance.html">PdxInstance</ulink>
types using the <ulink
url="http://www.vmware.com/support/developer/vfabric-gemfire/700-api/com/gemstone/gemfire/pdx/JSONFormatter.html">JSONFormatter</ulink>
to perform conversion to and from JSON strings. Spring Data GemFire
provides a <tag>&lt;gfe-data:json-region-autoproxy/&gt;</tag> tag to
enable a <ulink
url="http://static.springsource.org/spring/docs/current/spring-framework-reference/htmlsingle/#aop-introduction">Spring
AOP</ulink> component to advise appropropriate region operations,
effectively encapsulating the JSONFormatter, allowing your application to
work directly with JSON strings. In addition, Java objects written to JSON
configured regions will be automatically converted to JSON using the
Jackson ObjectMapper. Reading these values will return a JSON
string.</para>
<para>By default, <tag>&lt;gfe-data:json-region-autoproxy/&gt;</tag> will
perform the conversion on all regions. To apply this feature to selected
regions, provide a comma delimited list of their ids via the
<literal>region-refs</literal> attribute. Other attributes include a
<literal>pretty-print</literal> flag (false by default) and
<literal>convert-returned-collections</literal>. By default the results of
region operations getAll() and values() will be converted for configured
regions. This is done by creating a parallel structure in local memory.
This can incur significant overhead for large collections. Set this flag
to false to disable automatic conversion for these operation.
<note>Certain region operations, specifically those that use GemFire's
proprietary Region.Entry such as entries(boolean), entrySet(boolean) and
getEntry() type are not targeted for AOP advice. In addition, the
entrySet() method which returns a
Set&lt;java.util.Map.Entry&lt;?,?&gt;&gt; is not affected.</note></para>
<programlisting language="xml">
&lt;gfe-data:json-region-autoproxy pretty-print="true" region-refs="myJsonRegion" convert-returned-collections="true"/&gt;
</programlisting>
<para>This feature also works with seamlessly with GemfireTemplate operations, provided that the template is declared as a Spring bean. Currently native QueryService operations are not supported.
</para>
<para>This feature also works with seamlessly with GemfireTemplate
operations, provided that the template is declared as a Spring bean.
Currently native QueryService operations are not supported.</para>
</section>
</section>