/*
* Copyright (c) 2008, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
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* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
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* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
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package sun.tracing;
import java.lang.reflect.Method;
import java.lang.reflect.InvocationTargetException;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Set;
import com.sun.tracing.ProviderFactory;
import com.sun.tracing.Provider;
import com.sun.tracing.Probe;
/**
* Factory class to create tracing Providers.
*
* This factory creates a "multiplex provider", which is a provider that
* encapsulates a list of providers and whose probes trigger a corresponding
* trigger in each of the encapsulated providers' probes.
*
* This is used when there are multiple tracing frameworks activated at once.
* A user-defined provider gets implementation for each of the activated
* frameworks and this multiplex framework is what is ultimately passed
* back to the user. All probe triggers are multiplexed to each
* active framework.
*
* @since 1.7
*/
public class MultiplexProviderFactory extends ProviderFactory {
private Set<ProviderFactory> factories;
public MultiplexProviderFactory(Set<ProviderFactory> factories) {
this.factories = factories;
}
public <T extends Provider> T createProvider(Class<T> cls) {
HashSet<Provider> providers = new HashSet<Provider>();
for (ProviderFactory factory : factories) {
providers.add(factory.createProvider(cls));
}
MultiplexProvider provider = new MultiplexProvider(cls, providers);
provider.init();
return provider.newProxyInstance();
}
}
class MultiplexProvider extends ProviderSkeleton {
private Set<Provider> providers;
protected ProbeSkeleton createProbe(Method m) {
return new MultiplexProbe(m, providers);
}
MultiplexProvider(Class<? extends Provider> type, Set<Provider> providers) {
super(type);
this.providers = providers;
}
public void dispose() {
for (Provider p : providers) {
p.dispose();
}
super.dispose();
}
}
class MultiplexProbe extends ProbeSkeleton {
private Set<Probe> probes;
MultiplexProbe(Method m, Set<Provider> providers) {
super(m.getParameterTypes());
probes = new HashSet<Probe>();
for (Provider p : providers) {
Probe probe = p.getProbe(m);
if (probe != null) {
probes.add(probe);
}
}
}
public boolean isEnabled() {
for (Probe p : probes) {
if (p.isEnabled()) {
return true;
}
}
return false;
}
public void uncheckedTrigger(Object[] args) {
for (Probe p : probes) {
try {
// try the fast path
ProbeSkeleton ps = (ProbeSkeleton)p;
ps.uncheckedTrigger(args);
} catch (ClassCastException e) {
// Probe.trigger takes an "Object ..." varargs parameter,
// so we can't call it directly.
try {
Method m = Probe.class.getMethod(
"trigger", Class.forName("[java.lang.Object"));
m.invoke(p, args);
} catch (Exception e1) {
assert false; // This shouldn't happen
}
}
}
}
}