BEGIN LICENSE BLOCK *****
Version: EPL 2.0/GPL 2.0/LGPL 2.1
The contents of this file are subject to the Eclipse Public
License Version 2.0 (the "License"); you may not use this file
except in compliance with the License. You may obtain a copy of
the License at http://www.eclipse.org/legal/epl-v20.html
Software distributed under the License is distributed on an "AS
IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
implied. See the License for the specific language governing
rights and limitations under the License.
Copyright (C) 2007 Charles O Nutter 
Alternatively, the contents of this file may be used under the terms of
either of the GNU General Public License Version 2 or later (the "GPL"),
or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
in which case the provisions of the GPL or the LGPL are applicable instead
of those above. If you wish to allow use of your version of this file only
under the terms of either the GPL or the LGPL, and not to allow others to
use your version of this file under the terms of the EPL, indicate your
decision by deleting the provisions above and replace them with the notice
and other provisions required by the GPL or the LGPL. If you do not delete
the provisions above, a recipient may use your version of this file under
the terms of any one of the EPL, the GPL or the LGPL.
END LICENSE BLOCK /***** BEGIN LICENSE BLOCK *****
 * Version: EPL 2.0/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Eclipse Public
 * License Version 2.0 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of
 * the License at http://www.eclipse.org/legal/epl-v20.html
 *
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 *
 * Copyright (C) 2007 Charles O Nutter <headius@headius.com>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the EPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the EPL, the GPL or the LGPL.
 ***** END LICENSE BLOCK *****/

package org.jruby.internal.runtime;

import java.lang.ref.Reference;
import java.lang.ref.WeakReference;

import org.jruby.RubyString;
import org.jruby.RubyThread;
import org.jruby.runtime.builtin.IRubyObject;

Author:
cnutter/**
 * @author cnutter
 */
public class NativeThread implements ThreadLike {
    private final Reference<Thread> nativeThread;
    public final RubyThread rubyThread;
    public String rubyName;
    
    public NativeThread(RubyThread rubyThread, Thread nativeThread) {
        this.rubyThread = rubyThread;
        this.nativeThread = new WeakReference<>(nativeThread);
        this.rubyName = null;
    }
    
    public void start() {
        Thread thread = getThread();
        if (thread != null) thread.start();
    }
    
    public void interrupt() {
        Thread thread = getThread();
        if (thread != null) thread.interrupt();
    }
    
    public boolean isAlive() {
        Thread thread = getThread();
        if (thread != null) return thread.isAlive();
        return false;
    }
    
    public void join() throws InterruptedException {
        Thread thread = getThread();
        if (thread != null) thread.join();
    }
    
    public void join(long timeoutMillis) throws InterruptedException {
        Thread thread = getThread();
        if (thread != null) thread.join(timeoutMillis);
    }
    
    public int getPriority() {
        Thread thread = getThread();
        if (thread != null) return thread.getPriority();
        return 0;
    }
    
    public void setPriority(int priority) {
        Thread thread = getThread();
        if (thread != null) thread.setPriority(priority);
    }
    
    public boolean isCurrent() {
        return getThread() == Thread.currentThread();
    }
    
    public boolean isInterrupted() {
        Thread thread = getThread();
        if (thread != null) {
            return thread.isInterrupted();
        }
        return false;
    }

    public final Thread getThread() {
        return nativeThread.get();
    }

    public String toString() {
        return String.valueOf(getThread());
    }

    public Thread nativeThread() {
        return nativeThread.get();
    }

    @Override
    public void setRubyName(String id) {
        this.rubyName = id;
        updateName();
    }

    @Override
    @Deprecated
    public String getRubyName() {
        return rubyName;
    }

    @Override
    public String getReportName() {
        String nativeName = "";

        Thread thread = getThread();
        if (thread != null) nativeName = thread.getName();

        if (rubyName == null || rubyName.length() == 0) {
            return nativeName.equals("") ? "(unnamed)" :  nativeName;
        }

        return nativeName.equals("") ? rubyName : rubyName + " (" + nativeName + ")";
    }

    private static final String RUBY_THREAD_PREFIX = "Ruby-";

    void updateName() {
        // "Ruby-0-Thread-16: (irb):21"
        // "Ruby-0-Thread-17@worker#1: (irb):21"
        String newName;
        String setName = rubyName;
        Thread thread = getThread();

        if (thread == null) return;

        final String currentName = thread.getName();
        if (currentName != null && currentName.startsWith(RUBY_THREAD_PREFIX)) {
            final int i = currentName.indexOf('@'); // Thread#name separator
            if (i == -1) { // name not set yet: "Ruby-0-Thread-42: FILE:LINE"
                int end = currentName.indexOf(':');
                if (end == -1) end = currentName.length();
                final String prefix = currentName.substring(0, end);
                newName = currentName.replace(prefix, prefix + '@' + setName);

            } else { // name previously set: "Ruby-0-Thread-42@foo: FILE:LINE"
                final String prefix = currentName.substring(0, i); // Ruby-0-Thread-42
                int end = currentName.indexOf(':', i);
                if (end == -1) end = currentName.length();
                final String prefixWithName = currentName.substring(0, end); // Ruby-0-Thread-42@foo:
                newName = currentName.replace(prefixWithName, setName == null ? prefix : (prefix + '@' + setName));
            }
        } else return; // not a new-thread that and does not match out Ruby- prefix
        // ... very likely user-code set the java thread name - thus do not mess!
        try { thread.setName(newName); } catch (SecurityException ignore) { } // current thread can not modify
    }
}