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