JDK8/Java8源码在线阅读

/*
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 * 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
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/*
 * 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.request.EventRequest;
import com.sun.jdi.event.ClassPrepareEvent;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

class EventRequestSpecList {

    private static final int statusResolved = 1;
    private static final int statusUnresolved = 2;
    private static final int statusError = 3;

    // all specs
    private List<EventRequestSpec> eventRequestSpecs = Collections.synchronizedList(
                                                  new ArrayList<EventRequestSpec>());

    EventRequestSpecList() {
    }

    /**
     * Resolve all deferred eventRequests waiting for 'refType'.
     * @return true if it completes successfully, false on error.
     */
    boolean resolve(ClassPrepareEvent event) {
        boolean failure = false;
        synchronized(eventRequestSpecs) {
            for (EventRequestSpec spec : eventRequestSpecs) {
                if (!spec.isResolved()) {
                    try {
                        EventRequest eventRequest = spec.resolve(event);
                        if (eventRequest != null) {
                            MessageOutput.println("Set deferred", spec.toString());
                        }
                    } catch (Exception e) {
                        MessageOutput.println("Unable to set deferred",
                                              new Object [] {spec.toString(),
                                                             spec.errorMessageFor(e)});
                        failure = true;
                    }
                }
            }
        }
        return !failure;
    }

    void resolveAll() {
        for (EventRequestSpec spec : eventRequestSpecs) {
            try {
                EventRequest eventRequest = spec.resolveEagerly();
                if (eventRequest != null) {
                    MessageOutput.println("Set deferred", spec.toString());
                }
            } catch (Exception e) {
            }
        }
    }

    boolean addEagerlyResolve(EventRequestSpec spec) {
        try {
            eventRequestSpecs.add(spec);
            EventRequest eventRequest = spec.resolveEagerly();
            if (eventRequest != null) {
                MessageOutput.println("Set", spec.toString());
            }
            return true;
        } catch (Exception exc) {
            MessageOutput.println("Unable to set",
                                  new Object [] {spec.toString(),
                                                 spec.errorMessageFor(exc)});
            return false;
        }
    }

    BreakpointSpec createBreakpoint(String classPattern, int line)
        throws ClassNotFoundException {
        ReferenceTypeSpec refSpec =
            new PatternReferenceTypeSpec(classPattern);
        return new BreakpointSpec(refSpec, line);
    }

    BreakpointSpec createBreakpoint(String classPattern,
                                 String methodId,
                                    List<String> methodArgs)
                                throws MalformedMemberNameException,
                                       ClassNotFoundException {
        ReferenceTypeSpec refSpec =
            new PatternReferenceTypeSpec(classPattern);
        return new BreakpointSpec(refSpec, methodId, methodArgs);
    }

    EventRequestSpec createExceptionCatch(String classPattern,
                                          boolean notifyCaught,
                                          boolean notifyUncaught)
                                            throws ClassNotFoundException {
        ReferenceTypeSpec refSpec =
            new PatternReferenceTypeSpec(classPattern);
        return new ExceptionSpec(refSpec, notifyCaught, notifyUncaught);
    }

    WatchpointSpec createAccessWatchpoint(String classPattern,
                                       String fieldId)
                                      throws MalformedMemberNameException,
                                             ClassNotFoundException {
        ReferenceTypeSpec refSpec =
            new PatternReferenceTypeSpec(classPattern);
        return new AccessWatchpointSpec(refSpec, fieldId);
    }

    WatchpointSpec createModificationWatchpoint(String classPattern,
                                       String fieldId)
                                      throws MalformedMemberNameException,
                                             ClassNotFoundException {
        ReferenceTypeSpec refSpec =
            new PatternReferenceTypeSpec(classPattern);
        return new ModificationWatchpointSpec(refSpec, fieldId);

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