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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * This code is free software; you can redistribute it and/or modify it
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 * 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.
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 * 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).
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package jdk.jfr.internal.instrument;

import java.io.IOException;
import java.nio.ByteBuffer;

import jdk.jfr.events.FileForceEvent;
import jdk.jfr.events.FileReadEvent;
import jdk.jfr.events.FileWriteEvent;

See JITracer for an explanation of this code.
/** * See {@link JITracer} for an explanation of this code. */
@JIInstrumentationTarget("sun.nio.ch.FileChannelImpl") final class FileChannelImplInstrumentor { private FileChannelImplInstrumentor() { } private String path; @SuppressWarnings("deprecation") @JIInstrumentationMethod public void force(boolean metaData) throws IOException { FileForceEvent event = FileForceEvent.EVENT.get(); if (!event.isEnabled()) { force(metaData); return; } try { event.begin(); force(metaData); } finally { event.path = path; event.metaData = metaData; event.commit(); event.reset(); } } @SuppressWarnings("deprecation") @JIInstrumentationMethod public int read(ByteBuffer dst) throws IOException { FileReadEvent event = FileReadEvent.EVENT.get(); if (!event.isEnabled()) { return read(dst); } int bytesRead = 0; try { event.begin(); bytesRead = read(dst); } finally { if (bytesRead < 0) { event.endOfFile = true; } else { event.bytesRead = bytesRead; } event.path = path; event.commit(); event.reset(); } return bytesRead; } @SuppressWarnings("deprecation") @JIInstrumentationMethod public int read(ByteBuffer dst, long position) throws IOException { FileReadEvent event = FileReadEvent.EVENT.get(); if (!event.isEnabled()) { return read(dst, position); } int bytesRead = 0; try { event.begin(); bytesRead = read(dst, position); } finally { if (bytesRead < 0) { event.endOfFile = true; } else { event.bytesRead = bytesRead; } event.path = path; event.commit(); event.reset(); } return bytesRead; } @SuppressWarnings("deprecation") @JIInstrumentationMethod public long read(ByteBuffer[] dsts, int offset, int length) throws IOException { FileReadEvent event = FileReadEvent.EVENT.get(); if (!event.isEnabled()) { return read(dsts, offset, length); } long bytesRead = 0; try { event.begin(); bytesRead = read(dsts, offset, length); } finally { if (bytesRead < 0) { event.endOfFile = true; } else { event.bytesRead = bytesRead; } event.path = path; event.commit(); event.reset(); } return bytesRead; } @SuppressWarnings("deprecation") @JIInstrumentationMethod public int write(ByteBuffer src) throws IOException { FileWriteEvent event = FileWriteEvent.EVENT.get(); if (!event.isEnabled()) { return write(src); } int bytesWritten = 0; try { event.begin(); bytesWritten = write(src); } finally { event.bytesWritten = bytesWritten > 0 ? bytesWritten : 0; event.path = path; event.commit(); event.reset(); } return bytesWritten; } @SuppressWarnings("deprecation") @JIInstrumentationMethod public int write(ByteBuffer src, long position) throws IOException { FileWriteEvent event = FileWriteEvent.EVENT.get(); if (!event.isEnabled()) { return write(src, position); } int bytesWritten = 0; try { event.begin(); bytesWritten = write(src, position); } finally { event.bytesWritten = bytesWritten > 0 ? bytesWritten : 0; event.path = path; event.commit(); event.reset(); } return bytesWritten; } @SuppressWarnings("deprecation") @JIInstrumentationMethod public long write(ByteBuffer[] srcs, int offset, int length) throws IOException { FileWriteEvent event = FileWriteEvent.EVENT.get(); if (!event.isEnabled()) { return write(srcs, offset, length); } long bytesWritten = 0; try { event.begin(); bytesWritten = write(srcs, offset, length); } finally { event.bytesWritten = bytesWritten > 0 ? bytesWritten : 0; event.path = path; event.commit(); event.reset(); } return bytesWritten; } }