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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) 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
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 */
package com.oracle.truffle.api.instrumentation;

import java.util.Set;

import com.oracle.truffle.api.TruffleLanguage;
import com.oracle.truffle.api.nodes.Node;
import com.oracle.truffle.api.nodes.RootNode;

/**
 * Provides the capabilities to attach {@link ExecutionEventNodeFactory} and
 * {@link ExecutionEventListener} instances for a set of source locations specified by a
 * {@link SourceSectionFilter}. The result of an attachment is a {@link EventBinding binding}.
 *
 * @see #attachFactory(SourceSectionFilter, ExecutionEventNodeFactory)
 * @see #attachListener(SourceSectionFilter, ExecutionEventListener)
 * @since 0.12
 */
public abstract class Instrumenter {

    Instrumenter() {
    }

    /**
     * Starts event notification for a given {@link ExecutionEventNodeFactory factory} and returns a
     * {@link EventBinding binding} which represents a handle to dispose the notification.
     *
     * @since 0.12
     */
    public abstract  EventBinding attachFactory(SourceSectionFilter filter, T factory);

    /**
     * Starts event notification for a given {@link ExecutionEventListener listener} and returns a
     * {@link EventBinding binding} which represents a handle to dispose the notification.
     *
     * @since 0.12
     */
    public abstract  EventBinding attachListener(SourceSectionFilter filter, T listener);

    /**
     * Returns an unmodifiable {@link Set} of tag classes which where associated with this node. If
     * the instrumenter is used as a {@link TruffleLanguage} then only nodes can be queried for tags
     * that are associated with the current language otherwise an {@link IllegalArgumentException}
     * is thrown. The given node must not be null. If the given node is not
     * instrumentable, the given node is not yet adopted by a {@link RootNode} or the given tag was
     * not {@link ProvidedTags provided} by the language then always an empty {@link Set} is
     * returned.
     *
     * @param node the node to query
     * @return an unmodifiable {@link Set} of tag classes which where associated with this node.
     * @since 0.12
     */
    public abstract Set> queryTags(Node node);

}