Omaha #3132 - removing duplicated com.raytheon.uf.viz.core
Former-commit-id: 94468f09bd626bd2ff26e7312ceede154f427664
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Steve Harris
parent
5d58625abc
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c49eabbb45
2 changed files with 0 additions and 179 deletions
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/**
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* This software was developed and / or modified by Raytheon Company,
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* pursuant to Contract DG133W-05-CQ-1067 with the US Government.
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*
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* U.S. EXPORT CONTROLLED TECHNICAL DATA
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* This software product contains export-restricted data whose
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* export/transfer/disclosure is restricted by U.S. law. Dissemination
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* to non-U.S. persons whether in the United States or abroad requires
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* an export license or other authorization.
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*
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* Contractor Name: Raytheon Company
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* Contractor Address: 6825 Pine Street, Suite 340
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* Mail Stop B8
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* Omaha, NE 68106
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* 402.291.0100
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*
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* See the AWIPS II Master Rights File ("Master Rights File.pdf") for
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* further licensing information.
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**/
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package com.raytheon.uf.viz.core.reflect;
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import org.eclipse.osgi.framework.internal.core.AbstractBundle;
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import org.eclipse.osgi.framework.internal.core.BundleHost;
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import org.eclipse.osgi.internal.loader.BundleLoader;
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import org.eclipse.osgi.internal.loader.BundleLoaderProxy;
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import org.eclipse.osgi.service.resolver.BundleDescription;
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import org.osgi.framework.Bundle;
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import org.osgi.framework.BundleReference;
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/**
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* Utility class to get the BundleLoader object associated with a Bundle, to
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* potentially synchronize against that object.
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*
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* <pre>
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*
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* SOFTWARE HISTORY
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*
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* Date Ticket# Engineer Description
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* ------------ ---------- ----------- --------------------------
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* Aug 13, 2014 3500 bclement Initial creation
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*
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* </pre>
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*
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* @author bclement
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* @version 1.0
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* @see BundleSynchronizer
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*/
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public class BundleLoaderGetter {
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private BundleLoaderGetter() {
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}
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/**
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* Attempts to retrieve the BundleLoader associated with the bundle. Returns
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* the BundleLoader or null if it could not be retrieved.
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*
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* @param bundle
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* the bundle to retrieve the associated BundleLoader for
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* @return the BundleLoader or null
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*/
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@SuppressWarnings("restriction")
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protected static BundleLoader getBundleLoader(Bundle bundle) {
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BundleLoader rval = null;
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if (bundle instanceof AbstractBundle) {
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BundleDescription bundleDesc = ((AbstractBundle) bundle)
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.getBundleDescription();
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if (bundleDesc != null) {
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Object o = bundleDesc.getUserObject();
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if (!(o instanceof BundleLoaderProxy)) {
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if (o instanceof BundleReference)
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o = ((BundleReference) o).getBundle();
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if (o instanceof BundleHost)
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o = ((BundleHost) o).getLoaderProxy();
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}
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if (o instanceof BundleLoaderProxy) {
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rval = ((BundleLoaderProxy) o).getBundleLoader();
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}
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}
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}
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return rval;
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}
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}
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@ -1,96 +0,0 @@
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/**
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* This software was developed and / or modified by Raytheon Company,
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* pursuant to Contract DG133W-05-CQ-1067 with the US Government.
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*
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* U.S. EXPORT CONTROLLED TECHNICAL DATA
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* This software product contains export-restricted data whose
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* export/transfer/disclosure is restricted by U.S. law. Dissemination
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* to non-U.S. persons whether in the United States or abroad requires
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* an export license or other authorization.
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*
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* Contractor Name: Raytheon Company
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* Contractor Address: 6825 Pine Street, Suite 340
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* Mail Stop B8
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* Omaha, NE 68106
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* 402.291.0100
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*
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* See the AWIPS II Master Rights File ("Master Rights File.pdf") for
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* further licensing information.
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**/
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package com.raytheon.uf.viz.core.reflect;
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import org.eclipse.osgi.framework.internal.core.BundleRepository;
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import org.eclipse.osgi.internal.loader.BundleLoader;
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import org.osgi.framework.Bundle;
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/**
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* If a call to BundleWiring.getClassLoader() is invoked on a thread other than
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* main/UI thread, then there is a possible deadlock if the application shuts
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* down while the BundleWiring.getClassLoader() call is still going. The
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* BundleLoader and BundleRepository of the Framework are the primary resources
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* that are in contention in this deadlock scenario, due to the BundleRepository
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* being used as a synchronization lock both deep in
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* bundleWiring.getClassloader() and in Framework shutdown code. The other
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* resource used as a synchronization lock and causing the deadlock is the
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* BundleLoader associated with the bundle. When BundleLoader.findClass() is
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* called, it results in a lock on the BundleLoader and then a lock on the
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* BundleRepository. This happens when the DefaultClassLoader loads a class.
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*
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* Therefore to avoid this deadlock, if you are going to call
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* BundleWiring.getClassLoader() you should attempt synchronize against the
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* BundleLoader and the BundleRepository. This will ensure the call to
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* getClassLoader() can finish and then release synchronization locks of both
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* the BundleRepository and BundleLoader.
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*
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* If we fail to get the BundleLoader or BundleRepository, then you should
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* proceed onwards anyway because the odds of the application shutting down at
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* the same time as the call to BundleWiring.getClassLoader() is still running
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* is low. Even if that occurs, the odds are further reduced that the two
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* threads will synchronize against the BundleLoader and the BundleRepository at
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* the same time and deadlock.
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*
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* <pre>
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*
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* SOFTWARE HISTORY
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*
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* Date Ticket# Engineer Description
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* ------------ ---------- ----------- --------------------------
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* Aug 13, 2014 3500 bclement Initial creation
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*
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* </pre>
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*
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* @author bclement
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* @version 1.0
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*/
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public class BundleSynchronizer {
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private BundleSynchronizer() {
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}
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/**
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* Attempts to synchronize with the bundle's BundleLoader and
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* BundleRepository objects before running the runner. If either the
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* BundleLoader or the BundleRepository are unable to be retrieved from the
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* bundle, the runner is ran anyway since the likelihood of a deadlock is
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* relatively small.
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*
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* @param runner
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* @param bundle
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* @see BundleLoaderGetter#getBundleLoader(Bundle)
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* @see BundleRepositoryGetter#getFrameworkBundleRepository(Bundle)
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*/
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protected static void runSynchedWithBundle(Runnable runner, Bundle bundle) {
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BundleRepository repo = BundleRepositoryGetter
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.getFrameworkBundleRepository(bundle);
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BundleLoader loader = BundleLoaderGetter.getBundleLoader(bundle);
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if (repo != null && loader != null) {
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synchronized (loader) {
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synchronized (repo) {
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runner.run();
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}
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}
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} else {
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runner.run();
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}
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}
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}
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