JDK 11 jdk.compiler.jmod - Compiler Tool

JDK 11 jdk.compiler.jmod is the JMOD file for JDK 11 Compiler tool, which can be invoked by the "javac" command.

JDK 11 Compiler tool compiled class files are stored in \fyicenter\jdk-11.0.1\jmods\jdk.compiler.jmod.

JDK 11 Compiler tool compiled class files are also linked and stored in the \fyicenter\jdk-11.0.1\lib\modules JImage file.

JDK 11 Compiler source code files are stored in \fyicenter\jdk-11.0.1\lib\src.zip\jdk.compiler.

You can click and view the content of each source code file in the list below.

✍: FYIcenter

com/sun/tools/sjavac/server/PortFile.java

/*
 * Copyright (c) 2012, 2016, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
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 *
 *
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 *
 */

package com.sun.tools.sjavac.server;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.nio.channels.ClosedChannelException;
import java.nio.channels.FileChannel;
import java.nio.channels.FileLock;
import java.nio.channels.FileLockInterruptionException;
import java.util.concurrent.Semaphore;

import com.sun.tools.javac.util.Assert;
import com.sun.tools.sjavac.Log;
import com.sun.tools.sjavac.client.PortFileInaccessibleException;

/**
 * The PortFile class mediates access to a short binary file containing the tcp/ip port (for the localhost)
 * and a cookie necessary for the server answering on that port. The file can be locked using file system
 * primitives to avoid race conditions when several javac clients are started at the same. Note that file
 * system locking is not always supported on a all operating systems and/or file systems.
 *
 *  <p><b>This is NOT part of any supported API.
 *  If you write code that depends on this, you do so at your own risk.
 *  This code and its internal interfaces are subject to change or
 *  deletion without notice.</b>
 */
public class PortFile {

    // Port file format:
    // byte ordering: high byte first = big endian
    // Magic nr, 4 byte int, first in file.
    private final static int magicNr = 0x1174;
    // Followed by a 4 byte int, with the port nr.
    // Followed by a 8 byte long, with cookie nr.

    private String filename;
    private File file;
    private File stopFile;
    private RandomAccessFile rwfile;
    private FileChannel channel;

    // FileLock used to solve inter JVM synchronization, lockSem used to avoid
    // JVM internal OverlappingFileLockExceptions.
    // Class invariant: lock.isValid() <-> lockSem.availablePermits() == 0
    private FileLock lock;
    private Semaphore lockSem = new Semaphore(1);

    private boolean containsPortInfo;
    private int serverPort;
    private long serverCookie;
    private int myServerPort;
    private long myServerCookie;

    /**
     * Create a new portfile.
     * @param fn is the path to the file.
     */
    public PortFile(String fn) {
        filename = fn;
        file = new File(filename);
        stopFile = new File(filename+".stop");
        containsPortInfo = false;
        lock = null;
    }

    private void initializeChannel() throws PortFileInaccessibleException {
        try {
            rwfile = new RandomAccessFile(file, "rw");
        } catch (FileNotFoundException e) {
            // Reached if file for instance already exists and is a directory
            throw new PortFileInaccessibleException(e);
        }
        // The rwfile should only be readable by the owner of the process
        // and no other! How do we do that on a RandomAccessFile?
        channel = rwfile.getChannel();
    }

    /**
     * Lock the port file.
     */
    public void lock() throws IOException, InterruptedException {
        if (channel == null) {
            initializeChannel();
        }
        lockSem.acquire();
        lock = channel.lock();
    }

    /**
     * Read the values from the port file in the file system.
     * Expects the port file to be locked.
     */
    public void getValues()  {
        containsPortInfo = false;
        if (lock == null) {
            // Not locked, remain ignorant about port file contents.
            return;
        }
        try {
            if (rwfile.length()>0) {
                rwfile.seek(0);
                int nr = rwfile.readInt();
                serverPort = rwfile.readInt();
                serverCookie = rwfile.readLong();

                if (nr == magicNr) {
                    containsPortInfo = true;
                } else {
                    containsPortInfo = false;
                }
            }
        } catch (IOException e) {
            containsPortInfo = false;
        }
    }

    /**
     * Did the locking and getValues succeed?
     */
    public boolean containsPortInfo() {
        return containsPortInfo;
    }

    /**
     * If so, then we can acquire the tcp/ip port on localhost.
     */
    public int getPort() {
        Assert.check(containsPortInfo);
        return serverPort;
    }

    /**
     * If so, then we can acquire the server cookie.
     */
    public long getCookie() {
        Assert.check(containsPortInfo);
        return serverCookie;
    }

    /**
     * Store the values into the locked port file.
     */
    public void setValues(int port, long cookie) throws IOException {
        Assert.check(lock != null);
        rwfile.seek(0);
        // Write the magic nr that identifes a port file.
        rwfile.writeInt(magicNr);
        rwfile.writeInt(port);
        rwfile.writeLong(cookie);
        myServerPort = port;
        myServerCookie = cookie;
    }

    /**
     * Delete the port file.
     */
    public void delete() throws IOException, InterruptedException {
        // Access to file must be closed before deleting.
        rwfile.close();

        file.delete();

        // Wait until file has been deleted (deletes are asynchronous on Windows!) otherwise we
        // might shutdown the server and prevent another one from starting.
        for (int i = 0; i < 10 && file.exists(); i++) {
            Thread.sleep(1000);
        }
        if (file.exists()) {
            throw new IOException("Failed to delete file.");
        }
    }

    /**
     * Is the port file still there?
     */
    public boolean exists() throws IOException {
        return file.exists();
    }

    /**
     * Is a stop file there?
     */
    public boolean markedForStop() throws IOException {
        if (stopFile.exists()) {
            try {
                stopFile.delete();
            } catch (Exception e) {
            }
            return true;
        }
        return false;
    }

    /**
     * Unlock the port file.
     */
    public void unlock() throws IOException {
        if (lock == null) {
            return;
        }
        lock.release();
        lock = null;
        lockSem.release();
    }

    /**
     * Wait for the port file to contain values that look valid.
     */
    public void waitForValidValues() throws IOException, InterruptedException {
        final int MS_BETWEEN_ATTEMPTS = 500;
        long startTime = System.currentTimeMillis();
        long timeout = startTime + getServerStartupTimeoutSeconds() * 1000;
        while (true) {
            Log.debug("Looking for valid port file values...");
            if (exists()) {
                lock();
                getValues();
                unlock();
            }
            if (containsPortInfo) {
                Log.debug("Valid port file values found after " + (System.currentTimeMillis() - startTime) + " ms");
                return;
            }
            if (System.currentTimeMillis() > timeout) {
                break;
            }
            Thread.sleep(MS_BETWEEN_ATTEMPTS);
        }
        throw new IOException("No port file values materialized. Giving up after " +
                                      (System.currentTimeMillis() - startTime) + " ms");
    }

    /**
     * Check if the portfile still contains my values, assuming that I am the server.
     */
    public boolean stillMyValues() throws IOException, FileNotFoundException, InterruptedException {
        for (;;) {
            try {
                lock();
                getValues();
                unlock();
                if (containsPortInfo) {
                    if (serverPort == myServerPort &&
                        serverCookie == myServerCookie) {
                        // Everything is ok.
                        return true;
                    }
                    // Someone has overwritten the port file.
                    // Probably another javac server, lets quit.
                    return false;
                }
                // Something else is wrong with the portfile. Lets quit.
                return false;
            } catch (FileLockInterruptionException e) {
                continue;
            }
            catch (ClosedChannelException e) {
                // The channel has been closed since sjavac is exiting.
                return false;
            }
        }
    }

    /**
     * Return the name of the port file.
     */
    public String getFilename() {
        return filename;
    }

    private long getServerStartupTimeoutSeconds() {
        String str = System.getProperty("serverStartupTimeout");
        if (str != null) {
            try {
                return Integer.parseInt(str);
            } catch (NumberFormatException e) {
            }
        }
        return 60;
    }
}

com/sun/tools/sjavac/server/PortFile.java

 

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