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[CONF] Apache CXF Documentation > FailoverFeature

Sergey Beryozkin (Confluence) Thu, 01 Aug 2013 04:15:26 -0700

FailoverFeature

Page added by Sergey Beryozkin

Failover and Load Distributor Features

Failover
Load Distribution
Configuring JAX-RS clients

JAX-RS

Failover

The CXF Failover feature allows to configure CXF frontend clients to retry a call when the target endpoint becomes unavailable.
A number of retry strategies available: a client can iterate sequentially over the alternative addresses or chose them randomly.


<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:jaxws="http://cxf.apache.org/jaxws"
       xmlns:clustering="http://cxf.apache.org/clustering"
       xmlns:util="http://www.springframework.org/schema/util"
       xsi:schemaLocation="
http://cxf.apache.org/jaxws http://cxf.apache.org/schemas/jaxws.xsd
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd">
    <bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"/>
    
    <util:list id="addressList">
        <value>http://localhost:${testutil.ports.Server.1}/services1</value>
        <value>http://localhost:${testutil.ports.Server.2}/services2</value>
        <value>http://localhost:${testutil.ports.Server.3}/services3</value>
    </util:list>

    <bean id="SequentialAddresses" class="org.apache.cxf.clustering.SequentialStrategy">
        <property name="alternateAddresses">
            <ref bean="addressList"/>
        </property>
    </bean>

    <bean id="RandomAddresses" class="org.apache.cxf.clustering.RandomStrategy">
        <property name="alternateAddresses">
            <ref bean="addressList"/>
        </property>
    </bean>

    <!-- other jaxws:client attributes and elements are omitted for brewity -->
    
    <jaxws:client id="clientWithSeqFailoverSupport" address="http://localhost:8080/services">
       <jaxws:features>
           <clustering:failover>
                <clustering:strategy>
                    <ref bean="SequentialAddresses"/>
                </clustering:strategy>
            </clustering:failover>
       </jaxws:features>
    </jaxws:client>

    <!-- other jaxws:client attributes and elements are omitted for brewity -->

    <jaxws:client id="clientWithRandomFailoverSupport" address="http://localhost:8080/initialAddress">
       <jaxws:features>
           <clustering:failover>
                <clustering:strategy>
                    <ref bean="RandomAddresses"/>
                </clustering:strategy>
            </clustering:failover>
       </jaxws:features>
    </jaxws:client>

</beans>

Load Distribution

Load Distributor Feature is a Failover feature which can allow the clients to iterate over alternative addresses on every new call, irrespectively of whether the last call has reached its target or not. It can help with the controlling the traffic originating from CXF clients at individual servers.


<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:jaxws="http://cxf.apache.org/jaxws"
       xmlns:clustering="http://cxf.apache.org/clustering"
       xmlns:util="http://www.springframework.org/schema/util"
       xsi:schemaLocation="
http://cxf.apache.org/jaxws http://cxf.apache.org/schemas/jaxws.xsd
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd">
    <bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"/>
    
    <util:list id="addressList">
        <value>http://localhost:${testutil.ports.Server.1}/services1</value>
        <value>http://localhost:${testutil.ports.Server.2}/services2</value>
        <value>http://localhost:${testutil.ports.Server.3}/services3</value>
    </util:list>

    <bean id="SequentialAddresses" class="org.apache.cxf.clustering.SequentialStrategy">
        <property name="alternateAddresses">
            <ref bean="addressList"/>
        </property>
    </bean>

    <!-- other jaxws:client attributes and elements are omitted for brewity -->
    
    <jaxws:client id="clientWithLoadDistributor" address="http://localhost:8080/services">
       <jaxws:features>
           <clustering:loadDistributor>
                <clustering:strategy>
                    <ref bean="SequentialAddresses"/>
                </clustering:strategy>
            </clustering:loadDistributor>
       </jaxws:features>
    </jaxws:client>
</beans>

Configuring JAX-RS clients

JAX-RS

JAX-RS clients are configured exactly as JAX-WS clients are, please see this page for more info.

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