/*
* Copyright (c) 2005, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* 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).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package sun.tools.attach;
import com.sun.tools.attach.VirtualMachineDescriptor;
import com.sun.tools.attach.VirtualMachine;
import com.sun.tools.attach.AttachPermission;
import com.sun.tools.attach.AttachNotSupportedException;
import com.sun.tools.attach.spi.AttachProvider;
import java.io.IOException;
import java.util.List;
import java.util.Iterator;
import java.util.ArrayList;
import java.util.Set;
import java.net.URISyntaxException;
import sun.jvmstat.monitor.HostIdentifier;
import sun.jvmstat.monitor.Monitor;
import sun.jvmstat.monitor.MonitoredHost;
import sun.jvmstat.monitor.MonitoredVm;
import sun.jvmstat.monitor.MonitoredVmUtil;
import sun.jvmstat.monitor.VmIdentifier;
import sun.jvmstat.monitor.MonitorException;
/*
* Platform specific provider implementations extend this
*/
public abstract class HotSpotAttachProvider extends AttachProvider {
// perf count name for the JVM version
private static final String JVM_VERSION = "java.property.java.vm.version";
public HotSpotAttachProvider() {
}
public void checkAttachPermission() {
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
sm.checkPermission(
new AttachPermission("attachVirtualMachine")
);
}
}
/*
* This listVirtualMachines implementation is based on jvmstat. Can override
* this in platform implementations when there is a more efficient mechanism
* available.
*/
public List<VirtualMachineDescriptor> listVirtualMachines() {
ArrayList<VirtualMachineDescriptor> result =
new ArrayList<VirtualMachineDescriptor>();
MonitoredHost host;
Set vms;
try {
host = MonitoredHost.getMonitoredHost(new HostIdentifier((String)null));
vms = host.activeVms();
} catch (Throwable t) {
if (t instanceof ExceptionInInitializerError) {
t = t.getCause();
}
if (t instanceof ThreadDeath) {
throw (ThreadDeath)t;
}
if (t instanceof SecurityException) {
return result;
}
throw new InternalError(); // shouldn't happen
}
for (Object vmid: vms) {
if (vmid instanceof Integer) {
String pid = vmid.toString();
String name = pid; // default to pid if name not available
boolean isAttachable = false;
MonitoredVm mvm = null;
try {
mvm = host.getMonitoredVm(new VmIdentifier(pid));
try {
isAttachable = MonitoredVmUtil.isAttachable(mvm);
// use the command line as the display name
name = MonitoredVmUtil.commandLine(mvm);
} catch (Exception e) {
}
if (isAttachable) {
result.add(new HotSpotVirtualMachineDescriptor(this, pid, name));
}
} catch (Throwable t) {
if (t instanceof ThreadDeath) {
throw (ThreadDeath)t;
}
} finally {
if (mvm != null) {
mvm.detach();
}
}
}
}
return result;
}
Test if a VM is attachable. If it's not attachable,
an AttachNotSupportedException will be thrown. For example,
1.4.2 or 5.0 VM are not attachable. There are cases that
we can't determine if a VM is attachable or not and this method
will just return.
This method uses the jvmstat counter to determine if a VM
is attachable. If the target VM does not have a jvmstat
share memory buffer, this method returns.
Throws: - AttachNotSupportedException – if it's not attachable
/**
* Test if a VM is attachable. If it's not attachable,
* an AttachNotSupportedException will be thrown. For example,
* 1.4.2 or 5.0 VM are not attachable. There are cases that
* we can't determine if a VM is attachable or not and this method
* will just return.
*
* This method uses the jvmstat counter to determine if a VM
* is attachable. If the target VM does not have a jvmstat
* share memory buffer, this method returns.
*
* @exception AttachNotSupportedException if it's not attachable
*/
void testAttachable(String id) throws AttachNotSupportedException {
MonitoredVm mvm = null;
boolean isKernelVM = false;
try {
VmIdentifier vmid = new VmIdentifier(id);
MonitoredHost host = MonitoredHost.getMonitoredHost(vmid);
mvm = host.getMonitoredVm(vmid);
if (MonitoredVmUtil.isAttachable(mvm)) {
// it's attachable; so return false
return;
}
isKernelVM = MonitoredVmUtil.isKernelVM(mvm);
} catch (Throwable t) {
if (t instanceof ThreadDeath) {
ThreadDeath td = (ThreadDeath)t;
throw td;
}
// we do not know what this id is
return;
} finally {
if (mvm != null) {
mvm.detach();
}
}
// we're sure it's not attachable; throw exception
if (isKernelVM) {
throw new AttachNotSupportedException("Kernel VM does not support the attach mechanism");
} else {
throw new AttachNotSupportedException("The VM does not support the attach mechanism");
}
}
A virtual machine descriptor to describe a HotSpot virtual machine.
/**
* A virtual machine descriptor to describe a HotSpot virtual machine.
*/
static class HotSpotVirtualMachineDescriptor extends VirtualMachineDescriptor {
HotSpotVirtualMachineDescriptor(AttachProvider provider,
String id,
String displayName) {
super(provider, id, displayName);
}
public boolean isAttachable() {
return true;
}
}
}