/*
* Copyright (c) 1998, 2011, 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.
*/
/*
* This source code is provided to illustrate the usage of a given feature
* or technique and has been deliberately simplified. Additional steps
* required for a production-quality application, such as security checks,
* input validation and proper error handling, might not be present in
* this sample code.
*/
package com.sun.tools.example.debug.tty;
import com.sun.jdi.*;
import com.sun.jdi.request.EventRequest;
import com.sun.jdi.request.ExceptionRequest;
import com.sun.jdi.request.ClassPrepareRequest;
import com.sun.jdi.event.ClassPrepareEvent;
import java.util.ArrayList;
abstract class EventRequestSpec {
final ReferenceTypeSpec refSpec;
int suspendPolicy = EventRequest.SUSPEND_ALL;
EventRequest resolved = null;
ClassPrepareRequest prepareRequest = null;
EventRequestSpec(ReferenceTypeSpec refSpec) {
this.refSpec = refSpec;
}
/**
* The 'refType' is known to match, return the EventRequest.
*/
abstract EventRequest resolveEventRequest(ReferenceType refType)
throws Exception;
/**
* @return If this EventRequestSpec matches the 'refType'
* return the cooresponding EventRequest. Otherwise
* return null.
*/
synchronized EventRequest resolve(ClassPrepareEvent event) throws Exception {
if ((resolved == null) &&
(prepareRequest != null) &&
prepareRequest.equals(event.request())) {
resolved = resolveEventRequest(event.referenceType());
prepareRequest.disable();
Env.vm().eventRequestManager().deleteEventRequest(prepareRequest);
prepareRequest = null;
if (refSpec instanceof PatternReferenceTypeSpec) {
PatternReferenceTypeSpec prs = (PatternReferenceTypeSpec)refSpec;
if (! prs.isUnique()){
/*
* Class pattern event requests are never
* considered "resolved", since future class loads
* might also match.
* Create and enable a new ClassPrepareRequest to
* keep trying to resolve.
*/
resolved = null;
prepareRequest = refSpec.createPrepareRequest();
prepareRequest.enable();
}
}
}
return resolved;
}
synchronized void remove() {
if (isResolved()) {
Env.vm().eventRequestManager().deleteEventRequest(resolved());
}
if (refSpec instanceof PatternReferenceTypeSpec) {
PatternReferenceTypeSpec prs = (PatternReferenceTypeSpec)refSpec;
if (! prs.isUnique()){
/*
* This is a class pattern. Track down and delete
* all EventRequests matching this spec.
* Note: Class patterns apply only to ExceptionRequests,
* so that is all we need to examine.
*/
ArrayList<ExceptionRequest> deleteList = new ArrayList<ExceptionRequest>();
for (ExceptionRequest er :
Env.vm().eventRequestManager().exceptionRequests()) {
if (prs.matches(er.exception())) {
deleteList.add (er);
}
}
Env.vm().eventRequestManager().deleteEventRequests(deleteList);
}
}
}
private EventRequest resolveAgainstPreparedClasses() throws Exception {
for (ReferenceType refType : Env.vm().allClasses()) {
if (refType.isPrepared() && refSpec.matches(refType)) {
resolved = resolveEventRequest(refType);
}
}
return resolved;
}
synchronized EventRequest resolveEagerly() throws Exception {
try {
if (resolved == null) {
/*
* Not resolved. Schedule a prepare request so we
* can resolve later.
*/
prepareRequest = refSpec.createPrepareRequest();
prepareRequest.enable();
// Try to resolve in case the class is already loaded.
resolveAgainstPreparedClasses();
if (resolved != null) {
prepareRequest.disable();
Env.vm().eventRequestManager().deleteEventRequest(prepareRequest);
prepareRequest = null;
}
}
if (refSpec instanceof PatternReferenceTypeSpec) {
PatternReferenceTypeSpec prs = (PatternReferenceTypeSpec)refSpec;
if (! prs.isUnique()){
/*
* Class pattern event requests are never
* considered "resolved", since future class loads
* might also match. Create a new
* ClassPrepareRequest if necessary and keep
* trying to resolve.
*/
resolved = null;
if (prepareRequest == null) {
prepareRequest = refSpec.createPrepareRequest();
prepareRequest.enable();
}
}
}
} catch (VMNotConnectedException e) {
// Do nothing. Another resolve will be attempted when the
// VM is started.
}
return resolved;
}
/**
* @return the eventRequest this spec has been resolved to,
* null if so far unresolved.
*/
EventRequest resolved() {
return resolved;
}
/**
* @return true if this spec has been resolved.
*/
boolean isResolved() {
return resolved != null;
}
protected boolean isJavaIdentifier(String s) {
if (s.length() == 0) {
return false;
}
int cp = s.codePointAt(0);
if (! Character.isJavaIdentifierStart(cp)) {
return false;
}
for (int i = Character.charCount(cp); i < s.length(); i += Character.charCount(cp)) {
cp = s.codePointAt(i);
if (! Character.isJavaIdentifierPart(cp)) {
return false;
}
}
return true;
}
String errorMessageFor(Exception e) {
if (e instanceof IllegalArgumentException) {
return (MessageOutput.format("Invalid command syntax"));
} else if (e instanceof RuntimeException) {
// A runtime exception that we were not expecting
throw (RuntimeException)e;
} else {
return (MessageOutput.format("Internal error; unable to set",
this.refSpec.toString()));
}
}
}