[英]How to overwrite some pairs in java.util.Properties with all pairs from another java.util.Properties?
[英]Populate java.util.Properties from camel property placeholder
我刚刚开始学习OSGi和骆驼,并且正在从事一些已经实现的服务。 我有一个配置为借助OSGi蓝图在Servicemix上运行的捆绑软件,如下所示:
<blueprint xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:camel-cxf="http://camel.apache.org/schema/blueprint/cxf"
xmlns:jaxrs="http://cxf.apache.org/jaxrs" xmlns:cxf="http://cxf.apache.org/blueprint/core"
xsi:schemaLocation="
http://cxf.apache.org/jaxrs http://cxf.apache.org/schemas/jaxrs.xsd
http://camel.apache.org/schema/cxf http://camel.apache.org/schema/cxf/camel-cxf.xsd
http://cxf.apache.org/blueprint/core http://cxf.apache.org/schemas/blueprint/core.xsd
http://camel.apache.org/schema/blueprint/cxf http://camel.apache.org/schema/blueprint/cxf/camel-cxf.xsd">
<camelContext id="ctx1"
xmlns="http://camel.apache.org/schema/blueprint"
xsi:schemaLocation="http://camel.apache.org/schema/blueprint http://camel.apache.org/schema/blueprint/camel-blueprint.xsd">
<propertyPlaceholder location="properties/config.properties"/>
<routeBuilder ref="..." />
</camelContext>
当前, config.properties
位于捆绑包内,但我正在尝试将其外部化。
因此,我将蓝图更改为:
<blueprint xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:camel-cxf="http://camel.apache.org/schema/blueprint/cxf"
xmlns:jaxrs="http://cxf.apache.org/jaxrs" xmlns:cxf="http://cxf.apache.org/blueprint/core"
xsi:schemaLocation="
http://cxf.apache.org/jaxrs http://cxf.apache.org/schemas/jaxrs.xsd
http://camel.apache.org/schema/cxf http://camel.apache.org/schema/cxf/camel-cxf.xsd
http://cxf.apache.org/blueprint/core http://cxf.apache.org/schemas/blueprint/core.xsd
http://camel.apache.org/schema/blueprint/cxf http://camel.apache.org/schema/blueprint/cxf/camel-cxf.xsd">
<camelContext id="ctx1"
xmlns="http://camel.apache.org/schema/blueprint"
xsi:schemaLocation="http://camel.apache.org/schema/blueprint http://camel.apache.org/schema/blueprint/camel-blueprint.xsd">
<propertyPlaceholder location="${karaf.home}/etc/config.properties"/>
<routeBuilder ref="..." />
</camelContext>
...并且此配置工作正常。
我面临的问题是,该属性文件还通过java.util.properties在多个位置使用,该java.util.properties作为简单文件加载到util文件中的静态代码块中。
我可以在Java代码中使用骆驼上下文中加载的属性(骆驼代码除外)吗?
如果这不可能,那么我应该如何加载位于servicemix类路径中的属性文件以在骆驼上下文和Java代码中使用, 而在当前实现中的代码更改最少 。
我不建议在OSGI环境中使用对属性文件的静态访问。
对我而言,最好的方法是创建一个OSGI服务,该服务公开验证方法或属性本身(使用getter / setter方法),如下所示:
<service ref="myConfig">
<interfaces>
<value>org.osgi.service.cm.ManagedService</value>
<value>com.mycompany.services.common.api.MyConfig</value>
</interfaces>
<service-properties>
<entry key="service.pid" value="config.properties" />
</service-properties>
</service>
<bean id="myConfig" class="com.mycompany.services.common.config.MyConfigImpl" />
在需要访问该属性的任何OSGI捆绑包之后,可以通过以下方式引用它:
<reference id="myConfig" interface="com.mycompany.services.common.api.MyConfig"
activation="eager" availability="mandatory" />
在使用这种方法之前,由于静态方法和LOCK的使用,我们在束之间存在很多死锁。 由于我们使用OSGI服务,因此在刷新/部署捆绑软件时,它可以很好地正常工作。
我假设您想通过任何其他OSGI捆绑包访问属性文件,而不是通过OSGI上下文的外部代码访问。 如果要在OSGI上下文之外访问属性文件,建议在上述接口( <reference>
)上创建(REST)Web服务。
实施示例:
public class MyConfigImpl implements MyConfig, ManagedService {
// This is just the property keys
private final static String COLORS = "my.valid.colors";
private final static String PROP1 = "my.property.1";
private final static String PROP2 = "my.property.2";
private final static String PROP3 = "my.property.3";
// For validating against some properties
private List<String> colors = new ArrayList<>();
// For extracting a subset of properties
private String prop1;
private String prop2;
private String prop3;
// The whole set os properties published as Dictionary (could be transformed in Map as well)
private Dictionary props;
@Override // Implements MyConfig.isValidColor(String color)
public Boolean isValidColor(String color) {
if (colors.contains(color)) {
return true;
} else {
return false;
}
}
@Override // Implements MyConfig.getPropertyOne()
public String getPropertyOne(){
return prop1;
}
@Override // Implements MyConfig.getPropertyTwo()
public String getPropertyTwo(){
return prop2;
}
@Override // Implements MyConfig.getPropertyThree()
public String getPropertyThree(){
return prop3;
}
@Override // Implements MyConfig.getProperties()
public Dictionary getProperties(){
return props;
}
// This implements the ManagedService.updated()
@Override
public void updated(@SuppressWarnings("rawtypes") Dictionary properties) throws ConfigurationException {
log.debug("Reading properties: {}", properties);
if (properties == null) {
return;
}
updateConfiguration(properties);
}
private void updateConfiguration(Dictionary properties) {
// MyUtil.asListOfString is just a helper to convert comma separated string to list of String
// This is just an example
this.colors = MyUtil.asListOfStrings((String) properties.get(COLORS));
this.prop1 = properties.get(PROP1);
this.prop2 = properties.get(PROP2);
this.prop3 = properties.get(PROP3);
this.props = properties;
}
}
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