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Truffle is a multi-language framework for executing dynamic languages that achieves high performance when combined with Graal.

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/*
 * Copyright (c) 2015, 2016, 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.
 */
package com.oracle.truffle.api.debug.impl;

import com.oracle.truffle.api.debug.Debugger;
import com.oracle.truffle.api.instrumentation.Instrumenter;
import com.oracle.truffle.api.instrumentation.TruffleInstrument;
import com.oracle.truffle.api.instrumentation.TruffleInstrument.Registration;
import com.oracle.truffle.api.vm.PolyglotEngine;

@Registration(id = DebuggerInstrument.ID)
public final class DebuggerInstrument extends TruffleInstrument {
    public static final String ID = "debugger";

    private Debugger debugger;
    private Instrumenter instrumenter;

    @Override
    protected void onCreate(Env env) {
        this.instrumenter = env.getInstrumenter();
        env.registerService(this);
    }

    public Debugger getDebugger(PolyglotEngine engine, Factory factory) {
        if (debugger == null && factory != null) {
            debugger = factory.create(engine, instrumenter);
            if (debugger == null) {
                throw new NullPointerException();
            }
        }
        return debugger;
    }

    public interface Factory {
        Debugger create(PolyglotEngine engine, Instrumenter instrumenter);
    }
}