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Code Issues Wiki Activity

[181939] Deferred class loading for keystoreProviders

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This commit is contained in:
Martin Oberhuber 2007-05-11 21:48:12 +00:00
parent 8f161352bd
commit 4bf1cf9199
2 changed files with 121 additions and 36 deletions
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43
rse/plugins/org.eclipse.rse.core/src/org/eclipse/rse/core/RSECorePlugin.java
View file

@ -14,6 +14,7 @@
* David Dykstal (IBM) - added utility method for finding qualifiedHostNames
* Martin Oberhuber (Wind River) - [177523] Unify singleton getter methods
* Martin Oberhuber (Wind River) - [186525] Move keystoreProviders to core
* Martin Oberhuber (Wind River) - [181939] Deferred class loading for keystoreProviders
********************************************************************************/
package org.eclipse.rse.core;
@ -24,7 +25,6 @@ import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.IExtensionRegistry;
import org.eclipse.core.runtime.Platform;
import org.eclipse.core.runtime.Plugin;
import org.eclipse.rse.core.comm.ISystemKeystoreProvider;
import org.eclipse.rse.core.comm.SystemKeystoreProviderManager;
import org.eclipse.rse.core.model.ISystemRegistry;
import org.eclipse.rse.internal.core.RSECoreRegistry;
@ -119,7 +119,7 @@ public class RSECorePlugin extends Plugin {
}
/**
* Returns a qualified hostname given a potentially unqualified hostname
* Returns a qualified host name given a potentially unqualified host name
*/
public static String getQualifiedHostName(String hostName) {
try {
@ -220,8 +220,11 @@ public class RSECorePlugin extends Plugin {
private void log(Throwable t) {
getLogger().logError("Unexpected Exception", t); //$NON-NLS-1$
}
protected void registerKeystoreProviders()
/**
* Register declared keystore providers.
*/
private void registerKeystoreProviders()
{
// Get reference to the plug-in registry
IExtensionRegistry registry = Platform.getExtensionRegistry();
@ -231,28 +234,16 @@ public class RSECorePlugin extends Plugin {
for (int i = 0; i < systemTypeExtensions.length; i++)
{
try
{
// get the name space of the declaring extension
String nameSpace = systemTypeExtensions[i].getDeclaringExtension().getNamespaceIdentifier();
String keystoreProviderType = systemTypeExtensions[i].getAttribute("class"); //$NON-NLS-1$
// use the name space to get the bundle
Bundle bundle = Platform.getBundle(nameSpace);
if (bundle.getState() != Bundle.UNINSTALLED)
{
Class keystoreProvider = bundle.loadClass(keystoreProviderType);
ISystemKeystoreProvider extension = (ISystemKeystoreProvider)keystoreProvider.getConstructors()[0].newInstance(null);
SystemKeystoreProviderManager.getInstance().registerKeystoreProvider(extension);
}
}
catch (Exception e)
{
e.printStackTrace();
}
// get the name space of the declaring extension
String nameSpace = systemTypeExtensions[i].getDeclaringExtension().getNamespaceIdentifier();
String keystoreProviderType = systemTypeExtensions[i].getAttribute("class"); //$NON-NLS-1$
// use the name space to get the bundle
Bundle bundle = Platform.getBundle(nameSpace);
if (bundle.getState() != Bundle.UNINSTALLED)
{
SystemKeystoreProviderManager.getInstance().registerKeystoreProvider(bundle, keystoreProviderType);
}
}
}

114
rse/plugins/org.eclipse.rse.core/src/org/eclipse/rse/core/comm/SystemKeystoreProviderManager.java
View file

@ -12,6 +12,7 @@
*
* Contributors:
* Martin Oberhuber (Wind River) - [186525] Move keystoreProviders to core
* Martin Oberhuber (Wind River) - [181939] Deferred class loading for keystoreProviders
********************************************************************************/
package org.eclipse.rse.core.comm;
@ -19,48 +20,141 @@ package org.eclipse.rse.core.comm;
import java.util.ArrayList;
import java.util.List;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.rse.core.RSECorePlugin;
import org.osgi.framework.Bundle;
/**
* A Registry of keystore providers, with the ability to instantiate
* providers lazily when needed.
*/
public class SystemKeystoreProviderManager
{
private static SystemKeystoreProviderManager _instance = new SystemKeystoreProviderManager();
private List _extensions;
private static class ExtensionInfo {
public Bundle bundle;
public String className;
public ExtensionInfo(Bundle bundle, String className) {
this.bundle = bundle;
this.className = className;
}
}
private SystemKeystoreProviderManager()
{
_extensions= new ArrayList();
}
/**
* Return the SystemKeystoreProviderManager Instance.
* @return the singleton instance.
*/
public static SystemKeystoreProviderManager getInstance()
{
return _instance;
}
/**
* Register a keystore provider.
* @param ext keystore provider to register.
*/
public void registerKeystoreProvider(ISystemKeystoreProvider ext)
{
_extensions.add(ext);
}
/**
* Register a keystore provider for deferred (lazy) loading.
*
* @param bundle the bundle that declares the extension. The bundle
* must be installed and will be activated lazily when trying
* to load the given class name.
* @param className fully qualified classname of the keystore provider
* declared in the given bundle.
*/
public void registerKeystoreProvider(Bundle bundle, String className)
{
_extensions.add(new ExtensionInfo(bundle, className));
}
public boolean hasProvider()
{
return !_extensions.isEmpty();
}
/**
* Return the keystore provider at the given index in the registry,
* or <code>null</code> if there is no provider at the given index
* or it cannot be loaded.
* @return An ISystemKeystoreProvider instance, or <code>null</code>
* if no provider is found at the given index.
*/
public ISystemKeystoreProvider getProviderAt(int idx)
{
if (idx >= 0 && idx < _extensions.size()) {
Object o = _extensions.get(idx);
if (o instanceof ISystemKeystoreProvider) {
return (ISystemKeystoreProvider)o;
} else if (o instanceof ExtensionInfo) {
ExtensionInfo info = (ExtensionInfo)o;
try {
Class keystoreProvider = info.bundle.loadClass(info.className);
ISystemKeystoreProvider extension = (ISystemKeystoreProvider)keystoreProvider.getConstructors()[0].newInstance(null);
_extensions.set(idx, extension);
return extension;
} catch(Exception e) {
RSECorePlugin.getDefault().getLog().log(
new Status(IStatus.ERROR, info.bundle.getSymbolicName(), -1, e.getMessage(), e));
}
}
}
return null;
}
/**
* Return the default keystore provider.
* The default provider is the one which was added last by the
* extension registry, and loads properly.
* @return An ISystemKeystoreProvider instance, or <code>null</code>
* if no provider is found at the given index.
*/
public ISystemKeystoreProvider getDefaultProvider()
{
if (_extensions.size() > 0)
{
return (ISystemKeystoreProvider)_extensions.get(_extensions.size() - 1);
}
int idx = _extensions.size()-1;
while (idx>=0) {
ISystemKeystoreProvider provider = getProviderAt(idx);
if (provider!=null) {
return provider;
}
_extensions.remove(idx);
idx--;
}
return null;
}
/**
* Return an array of all registered keystore providers.
* The default provider is the one which was added last by the
* extension registry, and loads properly.
* @return An array of all registered keystore providers
* that load properly.
*/
public ISystemKeystoreProvider[] getProviders()
{
ISystemKeystoreProvider[] providers = new ISystemKeystoreProvider[_extensions.size()];
for (int i = 0; i < _extensions.size(); i++)
{
providers[i] = (ISystemKeystoreProvider)_extensions.get(i);
List providers = new ArrayList();
for (int i = _extensions.size()-1; i>=0; i--) {
ISystemKeystoreProvider provider = getProviderAt(i);
if (provider!=null) {
providers.add(0, provider);
} else {
_extensions.remove(i);
}
}
return providers;
ISystemKeystoreProvider[] result = (ISystemKeystoreProvider[])providers.toArray(new ISystemKeystoreProvider[providers.size()]);
return result;
}
}