src/jdk.jfr/share/classes/jdk/jfr/internal/instrument/SocketInputStreamInstrumentor.java

/*
 * Copyright (c) 2013, 2018, 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
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package jdk.jfr.internal.instrument;

import java.io.IOException;
import java.net.InetAddress;

import jdk.jfr.events.SocketReadEvent;

/**
 * See {@link JITracer} for an explanation of this code.
 */
@JIInstrumentationTarget("java.net.SocketInputStream")
@JITypeMapping(from = "jdk.jfr.internal.instrument.SocketInputStreamInstrumentor$AbstractPlainSocketImpl",
            to = "java.net.AbstractPlainSocketImpl")
final class SocketInputStreamInstrumentor {

    private SocketInputStreamInstrumentor() {
    }

    @SuppressWarnings("deprecation")
    @JIInstrumentationMethod
    int read(byte b[], int off, int length, int timeout) throws IOException {
        SocketReadEvent event = SocketReadEvent.EVENT.get();
        if (!event.isEnabled()) {
            return read(b, off, length, timeout);
        }
        int bytesRead = 0;
        try {
            event.begin();
            bytesRead = read(b, off, length, timeout);
        } finally {
            event.end();
            if (event.shouldCommit()) {
                String hostString  = impl.address.toString();
                int delimiterIndex = hostString.lastIndexOf('/');

                event.host      = hostString.substring(0, delimiterIndex);
                event.address   = hostString.substring(delimiterIndex + 1);
                event.port      = impl.port;
                if (bytesRead < 0) {
                    event.endOfStream = true;
                } else {
                    event.bytesRead = bytesRead;
                }
                event.timeout   = timeout;

                event.commit();
                event.reset();
            }
        }
        return bytesRead;
    }

    private AbstractPlainSocketImpl impl = null;

    void silenceFindBugsUnwrittenField(InetAddress dummy) {
        impl.address = dummy;
    }

    static class AbstractPlainSocketImpl {
        InetAddress address;
        int port;
    }
}