Comments (4)
Comment author: Lars Vogel <[email protected]>
The synchronized data structure HashTable is not recommened to be used, by several tools, e.g. Sonar shows this as warning. Would be nice if we could register services without creating warnings in our code.
Example:
Dictionary<String, String> props = new Hashtable<>();
props.put(Constants.SERVICE_VENDOR, "Eclipse"); //$NON-NLS-1$
props.put(Constants.SERVICE_PID, SimpleConfiguratorConstants.TARGET_CONFIGURATOR_NAME);
ServiceFactory<?> configurationFactory = new SimpleConfiguratorFactory(context);
configuratorRegistration = context.registerService(Configurator.class.getName(), configurationFactory, props);
from design.
Comment author: Lars Vogel <[email protected]>
The synchronized data structure HashTable is not recommened to be used, by several tools, e.g. Sonar shows this as warning.
Even the Java-doc of Dictionary says that Map should be used instead.
Dictionary
is referenced in the following classes (at least in the eclipse implementation org.eclipse.osgi
) :
org.osgi.framework.Bundle
org.osgi.framework.BundleContext
org.osgi.framework.Constants
org.osgi.framework.Filter
org.osgi.framework.FrameworkUtil
org.osgi.framework.ServiceEvent
org.osgi.framework.ServiceReference
org.osgi.framework.ServiceRegistration
org.osgi.service.condpermadmin.Condition
Some of them define API using Dictionary, some only consume it. But all of them should be considered when Dictionary is replaced some day.
from design.
See the new FrameworkUtil.asDictionary(Map)
helper method which can be used here. This method was recently added as a bridge from Maps to the OSGi API.
Map<String, String> props = new HashMap<>();
props.put(Constants.SERVICE_VENDOR, "Eclipse"); //$NON-NLS-1$
props.put(Constants.SERVICE_PID, SimpleConfiguratorConstants.TARGET_CONFIGURATOR_NAME);
ServiceFactory<?> configurationFactory = new SimpleConfiguratorFactory(context);
configuratorRegistration = context.registerService(Configurator.class.getName(), configurationFactory, FrameworkUtil.asDictionary(props));
from design.
I can see your problems with the dictionary. But in most cases of using dictionaries it might be better to use newer patterns.
e.g. use @ Component and other ComponentPropertType annotations and do not try to register everything by hand in the BundleActivator.
The only way i really use an dictionary is in tests. But there I use the powerfully Dictionaries class. Maybe more of the functionally should be available in the framework package.
Btw.
The javadoc does not say that you should use maps instead of dictionarys. It says only to not do new implementations.
New implementations should implement the Map interface, rather than extending this class.
from design.
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from design.