275 lines
12 KiB
Java
275 lines
12 KiB
Java
/*
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* Copyright (c) 2005, 2013, 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 com.sun.tools.attach.spi;
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import java.io.IOException;
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import java.util.Collections;
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import java.util.Iterator;
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import java.util.ArrayList;
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import java.util.List;
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import com.sun.tools.attach.VirtualMachine;
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import com.sun.tools.attach.VirtualMachineDescriptor;
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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 java.util.ServiceLoader;
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/**
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* Attach provider class for attaching to a Java virtual machine.
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*
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* <p> An attach provider is a concrete subclass of this class that has a
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* zero-argument constructor and implements the abstract methods specified
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* below. </p>
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*
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* <p> An attach provider implementation is typically tied to a Java virtual
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* machine implementation, version, or even mode of operation. That is, a specific
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* provider implementation will typically only be capable of attaching to
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* a specific Java virtual machine implementation or version. For example, Sun's
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* JDK implementation ships with provider implementations that can only attach to
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* Sun's <i>HotSpot</i> virtual machine. In general, if an environment
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* consists of Java virtual machines of different versions and from different
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* vendors then there will be an attach provider implementation for each
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* <i>family</i> of implementations or versions. </p>
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*
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* <p> An attach provider is identified by its {@link #name <i>name</i>} and
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* {@link #type <i>type</i>}. The <i>name</i> is typically, but not required to
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* be, a name that corresponds to the VM vendor. The Sun JDK implementation,
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* for example, ships with attach providers that use the name <i>"sun"</i>. The
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* <i>type</i> typically corresponds to the attach mechanism. For example, an
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* implementation that uses the Doors inter-process communication mechanism
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* might use the type <i>"doors"</i>. The purpose of the name and type is to
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* identify providers in environments where there are multiple providers
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* installed. </p>
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*
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* <p> AttachProvider implementations are loaded and instantiated at the first
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* invocation of the {@link #providers() providers} method. This method
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* attempts to load all provider implementations that are installed on the
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* platform. </p>
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*
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* <p> All of the methods in this class are safe for use by multiple
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* concurrent threads. </p>
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*
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* @since 1.6
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*/
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@jdk.Exported
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public abstract class AttachProvider {
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private static final Object lock = new Object();
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private static List<AttachProvider> providers = null;
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/**
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* Initializes a new instance of this class. </p>
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*
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* @throws SecurityException
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* If a security manager has been installed and it denies
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* {@link com.sun.tools.attach.AttachPermission AttachPermission}
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* <tt>("createAttachProvider")</tt>
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*/
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protected AttachProvider() {
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SecurityManager sm = System.getSecurityManager();
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if (sm != null)
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sm.checkPermission(new AttachPermission("createAttachProvider"));
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}
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/**
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* Return this provider's name. </p>
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*
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* @return The name of this provider
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*/
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public abstract String name();
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/**
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* Return this provider's type. </p>
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*
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* @return The type of this provider
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*/
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public abstract String type();
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/**
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* Attaches to a Java virtual machine.
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*
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* <p> A Java virtual machine is identified by an abstract identifier. The
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* nature of this identifier is platform dependent but in many cases it will be the
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* string representation of the process identifier (or pid). </p>
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*
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* <p> This method parses the identifier and maps the identifier to a Java
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* virtual machine (in an implementation dependent manner). If the identifier
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* cannot be parsed by the provider then an {@link
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* com.sun.tools.attach.AttachNotSupportedException AttachNotSupportedException}
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* is thrown. Once parsed this method attempts to attach to the Java virtual machine.
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* If the provider detects that the identifier corresponds to a Java virtual machine
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* that does not exist, or it corresponds to a Java virtual machine that does not support
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* the attach mechanism implemented by this provider, or it detects that the
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* Java virtual machine is a version to which this provider cannot attach, then
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* an <code>AttachNotSupportedException</code> is thrown. </p>
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*
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* @param id
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* The abstract identifier that identifies the Java virtual machine.
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*
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* @return VirtualMachine representing the target virtual machine.
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*
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* @throws SecurityException
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* If a security manager has been installed and it denies
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* {@link com.sun.tools.attach.AttachPermission AttachPermission}
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* <tt>("attachVirtualMachine")</tt>, or other permission
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* required by the implementation.
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*
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* @throws AttachNotSupportedException
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* If the identifier cannot be parsed, or it corresponds to
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* to a Java virtual machine that does not exist, or it
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* corresponds to a Java virtual machine which this
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* provider cannot attach.
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*
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* @throws IOException
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* If some other I/O error occurs
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*
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* @throws NullPointerException
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* If <code>id</code> is <code>null</code>
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*/
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public abstract VirtualMachine attachVirtualMachine(String id)
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throws AttachNotSupportedException, IOException;
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/**
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* Attaches to a Java virtual machine.
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*
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* <p> A Java virtual machine can be described using a {@link
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* com.sun.tools.attach.VirtualMachineDescriptor VirtualMachineDescriptor}.
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* This method invokes the descriptor's {@link
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* com.sun.tools.attach.VirtualMachineDescriptor#provider() provider()} method
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* to check that it is equal to this provider. It then attempts to attach to the
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* Java virtual machine.
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*
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* @param vmd
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* The virtual machine descriptor
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*
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* @return VirtualMachine representing the target virtual machine.
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*
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* @throws SecurityException
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* If a security manager has been installed and it denies
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* {@link com.sun.tools.attach.AttachPermission AttachPermission}
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* <tt>("attachVirtualMachine")</tt>, or other permission
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* required by the implementation.
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*
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* @throws AttachNotSupportedException
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* If the descriptor's {@link
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* com.sun.tools.attach.VirtualMachineDescriptor#provider() provider()} method
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* returns a provider that is not this provider, or it does not correspond
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* to a Java virtual machine to which this provider can attach.
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*
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* @throws IOException
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* If some other I/O error occurs
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*
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* @throws NullPointerException
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* If <code>vmd</code> is <code>null</code>
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*/
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public VirtualMachine attachVirtualMachine(VirtualMachineDescriptor vmd)
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throws AttachNotSupportedException, IOException
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{
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if (vmd.provider() != this) {
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throw new AttachNotSupportedException("provider mismatch");
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}
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return attachVirtualMachine(vmd.id());
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}
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/**
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* Lists the Java virtual machines known to this provider.
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*
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* <p> This method returns a list of {@link
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* com.sun.tools.attach.VirtualMachineDescriptor} elements. Each
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* <code>VirtualMachineDescriptor</code> describes a Java virtual machine
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* to which this provider can <i>potentially</i> attach. There isn't any
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* guarantee that invoking {@link #attachVirtualMachine(VirtualMachineDescriptor)
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* attachVirtualMachine} on each descriptor in the list will succeed.
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*
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* @return The list of virtual machine descriptors which describe the
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* Java virtual machines known to this provider (may be empty).
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*/
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public abstract List<VirtualMachineDescriptor> listVirtualMachines();
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/**
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* Returns a list of the installed attach providers.
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*
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* <p> An AttachProvider is installed on the platform if:
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*
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* <ul>
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* <li><p>It is installed in a JAR file that is visible to the defining
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* class loader of the AttachProvider type (usually, but not required
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* to be, the {@link java.lang.ClassLoader#getSystemClassLoader system
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* class loader}).</p></li>
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*
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* <li><p>The JAR file contains a provider configuration named
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* <tt>com.sun.tools.attach.spi.AttachProvider</tt> in the resource directory
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* <tt>META-INF/services</tt>. </p></li>
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*
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* <li><p>The provider configuration file lists the full-qualified class
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* name of the AttachProvider implementation. </p></li>
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* </ul>
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*
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* <p> The format of the provider configuration file is one fully-qualified
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* class name per line. Space and tab characters surrounding each class name,
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* as well as blank lines are ignored. The comment character is
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* <tt>'#'</tt> (<tt>0x23</tt>), and on each line all characters following
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* the first comment character are ignored. The file must be encoded in
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* UTF-8. </p>
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*
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* <p> AttachProvider implementations are loaded and instantiated
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* (using the zero-arg constructor) at the first invocation of this method.
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* The list returned by the first invocation of this method is the list
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* of providers. Subsequent invocations of this method return a list of the same
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* providers. The list is unmodifable.</p>
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*
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* @return A list of the installed attach providers.
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*/
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public static List<AttachProvider> providers() {
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synchronized (lock) {
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if (providers == null) {
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providers = new ArrayList<AttachProvider>();
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ServiceLoader<AttachProvider> providerLoader =
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ServiceLoader.load(AttachProvider.class,
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AttachProvider.class.getClassLoader());
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Iterator<AttachProvider> i = providerLoader.iterator();
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while (i.hasNext()) {
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try {
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providers.add(i.next());
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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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// Ignore errors and exceptions
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System.err.println(t);
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}
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}
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}
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return Collections.unmodifiableList(providers);
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}
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}
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}
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