CODEWITHSUNDEEP
javaspringproperties
HafkensitE
HafkensitE

Reputation: 71

Using properties defined by <context:property-placeholder> in a factory method

I have written a factory bean that creates a cache manager based on the properties that are configured in a application specific properties file.

The concept is that multiple implementations can be chosen, each using other configuration properties.

For example:

I think it is nice to not specify all cache-application specific parameters in the application-context.xml, but read them from the existing properties sources.

My attempt was using a EnvironementAware interface to get access to the Environement. But it seems that the property file that is configured using <context:property-placeholder> is not contained in the PropertiesSources.

example.properties

cache.implementation=memcached
cache.memcached.servers=server1:11211,server2:11211

application-context.xml

<context:property-placeholder location="example.properties"/>
<bean id="cacheManager" class="com.example.CacheManagerFactory"/>

In CacheManagerFactory.java

public class CacheManagerFactory implements FactoryBean<CacheManager>, EnvironmentAware {

    private Environement env;

    @Override
    public CacheManager getObject() throws Exception {
        String impl = env.getRequiredProperty("cache.implementation"); // this fails
    //Do something based on impl, which requires more properties.
    }

    @Override
    public void setEnvironment(Environment env) {
        this.env = env;
    }

    @Override
    public Class<?> getObjectType() {
        return CacheManager.class;
    }

    @Override
    public boolean isSingleton() {
        return true;
    }

}

Upvotes: 3

Views: 5951

Answers (1)

NimChimpsky
NimChimpsky

Reputation: 47280

In config file like this :

 <context:property-placeholder location="classpath:your.properties" ignore-unresolvable="true"/>
  ...
 <property name="email" value="${property1.email}"/>
 <!-- or -->
 <property name="email">
   <value>${property1.email}</value>
 </property>

or in code :

@Value("${cities}")
private String cities;

where the your.properties contains this :

cities = my test string 
property1.email = [email protected]

Upvotes: 3

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