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/*
* Copyright (c) 2012, 2018 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package org.glassfish.diagnostics.context.impl;
import org.glassfish.contextpropagation.*;
import org.glassfish.diagnostics.context.Context;
import org.glassfish.contextpropagation.spi.ContextMapHelper;
import org.glassfish.diagnostics.context.ContextManager;
import org.glassfish.hk2.api.Rank;
import org.glassfish.logging.annotation.LogMessageInfo;
import org.jvnet.hk2.annotations.Service;
import java.util.EnumSet;
import java.util.HashSet;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* Default implementation of ContextManager.
*/
@Service
@Rank(500)
public class ContextManagerImpl
implements ContextManager{
private static final String CLASS_NAME = ContextManagerImpl.class.getName();
/**
* Implementation of Location for those (hopfefully) rare occasions
* in which we need to hand back to our fans a Context that could
* not be found or constructed in the usual way.
*/
private static class HackedUnavailableLocation extends Location{
HackedUnavailableLocation()
{
super((View)null);
}
public String getLocationId(){
return "";
}
public String getOrigin(){
return "";
}
}
/**
* Context implementation for those (hopfefully) rare occasions
* in which we need to hand back to our fans a Context that could
* not be found or constructed in the usual way.
*/
private static final Context dummyContextInstance = new Context()
{
private final Location sLocation = new HackedUnavailableLocation();
@Override
public Location getLocation() {
return sLocation;
}
@Override
public T put(String name, String value, boolean propagates) {
return null;
}
@Override
public T put(String name, Number value, boolean propagates) {
return null;
}
@Override
public T remove(String name) {
return null;
}
@Override
public T get(String name) {
return null;
}
};
@LogMessageInfo(
message = "Can not fulfill request to get diagnostics context.",
comment = "A diagnostics context can not be found (or created).",
cause = "",
action = "",
level ="WARNING")
private static final String CAN_NOT_GET_CONTEXT_AS_DIAG_3000 = "NCLS-DIAG-03000";
@LogMessageInfo(
message = "An exception has prevented a diagnostics context from being created.",
comment = "A diagnostics context can not be found or created.",
cause = "(see underlying exception)",
action = "(see underlying exception)",
level = "WARNING")
private static final String EXCEPTION_CREATING_CONTEXT_AS_DIAG_3001 = "NCLS-DIAG-03001";
/**
* Propagation modes for data that is set as propagates in the put
* methods.
*
* This must always match the set of modes returned from
* PropagationMode.defaultSetOneway to guarantee that the data
* of this ViewCapable are propagated over the same set of modes as
* the Location. We do not reference defaultSetOneway because
* we need to avoid propagation modes other than those we specify below.
*/
static final EnumSet sfGlobalPropagationModes =
EnumSet.of(PropagationMode.THREAD,
PropagationMode.RMI,
PropagationMode.JMS_QUEUE,
PropagationMode.SOAP,
PropagationMode.MIME_HEADER,
PropagationMode.ONEWAY);
static final EnumSet sfLocalPropagationModes =
EnumSet.of(PropagationMode.LOCAL);
// Check that PropagationMode.defaultSetOneway() and sfGlobalPropagationModes
// match (if they do not then we lose data integrity).
static
{
Set tmp = new HashSet(PropagationMode.defaultSetOneway());
tmp.removeAll(sfGlobalPropagationModes);
if (!tmp.isEmpty())
{
throw new IllegalStateException(
"Mismatched propagation modes - PropagationMode.defaultSetOneWay()" +
" has more modes than sfGlobalPropagationModes.");
}
tmp = new HashSet(sfGlobalPropagationModes);
tmp.removeAll(PropagationMode.defaultSetOneway());
if (!tmp.isEmpty())
{
throw new IllegalStateException(
"Mismatched propagation modes - sfGlobalPropagationModes has more" +
" modes than PropagationMode.defaultSetOneWay().");
}
}
// Register the DiagnosticContextViewFactory with the contextpropagation
// framework.
static{
LOGGER.entering(CLASS_NAME,
"");
ContextMapHelper.registerContextFactoryForPrefixNamed(
WORK_CONTEXT_KEY,
new DiagnosticContextViewFactory());
LOGGER.exiting(CLASS_NAME,
"");
}
/**
* ContextViewFactory class implementation that fulfills a contract
* with contextpropagation package.
*/
private static class DiagnosticContextViewFactory
implements ContextViewFactory {
@Override // ContextViewFactory
public ContextImpl createInstance(final View view)
{
LOGGER.entering(CLASS_NAME, "createInstance(View)");
final Location location =
ContextMapHelper.getScopeAwareContextMap().getLocation();
ContextImpl retVal = new ContextImpl(view, location);
LOGGER.exiting(CLASS_NAME, "createInstance(View)", retVal.toString());
return retVal;
}
@Override // ContextViewFactory
public EnumSet getPropagationModes(){
return sfGlobalPropagationModes;
}
}
@Override // from ContextManager
public Context getContext()
{
LOGGER.entering(CLASS_NAME, "getContext()");
Context retVal = null;
ContextMap contextMap = ContextMapHelper.getScopeAwareContextMap();
try{
retVal = contextMap.get(WORK_CONTEXT_KEY);
if (retVal == null){
LOGGER.logp(Level.FINEST, CLASS_NAME, "getContext()",
"No ContextImpl found in ContextMap, creating a new one.");
ContextImpl contextImpl = contextMap.createViewCapable(WORK_CONTEXT_KEY);
retVal = contextImpl;
}
}
catch (InsufficientCredentialException isce)
{
// Nothing we can do to remedy isce so log the exception and move on
// Do we return null or a dummy Context implementation?
// Most callers won't be looking too closely at the context and
// they probably won't want to concern themselves with problems
// bubbling up from the contextpropagation layer, so a dummy
// Context is preferred - the buck stops here!
LOGGER.logp(Level.WARNING, CLASS_NAME, "getContext()",
EXCEPTION_CREATING_CONTEXT_AS_DIAG_3001, isce);
retVal = dummyContextInstance;
}
if (retVal == null)
{
LOGGER.logp(Level.WARNING, CLASS_NAME, "getContext()",
CAN_NOT_GET_CONTEXT_AS_DIAG_3000);
retVal = dummyContextInstance;
}
LOGGER.exiting(CLASS_NAME, "getContext()", retVal);
return retVal;
}
}
