| [SOLVED] Using P2 garbage collector [message #1403723] |
Fri, 25 July 2014 14:47  |
 Alex Mising name
Messages: 149
Registered: March 2010 |
Senior Member |
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Hi,
I have a problem with the instructions in the Equinox/p2 FAQ, which provides this snippet for running the garbage collector from code:
IProvisioningAgentProvider provider = // obtain the IProvisioningAgentProvider using OSGi services
IProvisioningAgent agent = provider.createAgent(null); // null = location for running system
if(agent == null) throw new RuntimeException("Location was not provisioned by p2");
IProfileRegistry profileRegistry = (IProfileRegistry) agent.getService(IProfileRegistry.SERVICE_NAME);
if (profileRegistry == null) throw new RuntimeException("Unable to acquire the profile registry service.");
// can also use IProfileRegistry.SELF for the current profile
IProfile profile = profileRegistry.getProfile("SDKProfile");
GarbageCollector gc = (GarbageCollector) agent.getService(GarbageCollector.SERVICE_NAME);
gc.runGC(profile);
I want to use this code to explicitly invoke the GarbageCollector, but his class is inaccessible due to an access restriction (the "org.eclipse.equinox.p2.garbagecollector" plugin exports package "org.eclipse.equinox.internal.p2.garbagecollector" with an "x-friends" restriction for "org.eclipse.equinox.p2.touchpoint.eclipse" and "org.eclipse.pde.core". Here is the MANIFEST.MF snippet:
Export-Package: org.eclipse.equinox.internal.p2.garbagecollector;x-fri
ends:="org.eclipse.equinox.p2.touchpoint.eclipse,org.eclipse.pde.core
"
So what is the "proper" way to invoke the GC from code? (would be a nice update for the FAQ page as well)
[Updated on: Thu, 07 August 2014 13:14] Report message to a moderator |
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| Re: Using P2 garbage collector [message #1405162 is a reply to message #1403723] |
Wed, 06 August 2014 18:25  |
Alex Mising name
Messages: 149
Registered: March 2010 |
Senior Member |
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|
The only way I've managed to run the garbage collector in a "clean" way, is to mock an application context and fire up a "nested" application like this:
public static final String P2_GC_PLUGIN_ID = "org.eclipse.equinox.p2.garbagecollector";
public static final String APPLICATION_EXT_POINT = "org.eclipse.core.runtime.applications";
IApplication app = null;
IExtensionRegistry reg = Platform.getExtensionRegistry();
IExtensionPoint ep = reg.getExtensionPoint(APPLICATION_EXT_POINT);
IExtension[] extensions = ep.getExtensions();
found: for (int i = 0; i < extensions.length; i++) {
IExtension ext = extensions[i];
IConfigurationElement[] ce = ext.getConfigurationElements();
for (int j = 0; j < ce.length; j++) {
IContributor contributor = ext.getContributor();
String name = contributor.getName();
if (P2_GC_PLUGIN_ID.equals(name)) {
Object obj = ce[j].createExecutableExtension("run");
app = (IApplication) obj;
break found;
}
}
}
if (app == null) {
throw new RuntimeException(
"Could not find P2 garbage collection application extension.");
} else {
app.start(getP2AppContextForProfile("profile"));
}
The mock context simple returns the "-profile" argument that specifies the profile name:
private static IApplicationContext getP2AppContextForProfile(final String profileName) {
return new IApplicationContext() {
@Override
public Map<?,?> getArguments() {
Map<String, Object> m = new HashMap<String, Object>();
m.put(IApplicationContext.APPLICATION_ARGS, new String[] {
"-profile", profileName });
return m;
}
// all other methods do nothing and return null
};
}
[Updated on: Wed, 06 August 2014 19:16] Report message to a moderator |
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