/*
* Copyright (c) 2011-2012, 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.sun.tools.sjavac.server;
import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.io.FileNotFoundException;
import java.net.URI;
import java.util.HashSet;
import java.util.Set;
import java.util.HashMap;
import java.util.Map;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.SocketAddress;
import java.util.ArrayList;
import java.util.Random;
import com.sun.tools.sjavac.Util;
import com.sun.tools.sjavac.ProblemException;
import java.io.*;
import java.util.*;
/**
* The JavacServer class contains methods both to setup a server that responds to requests and methods to connect to this server.
*
* <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></p>
*/
public class JavacServer {
// Responding to this tcp/ip port on localhost.
private final ServerSocket serverSocket;
// The secret cookie shared between server and client through the port file.
private final long myCookie;
// When the server was started.
private long serverStart;
// Accumulated build time for all requests, not counting idle time.
private long totalBuildTime;
// The javac server specific log file.
PrintWriter theLog;
// The compiler pool that maintains the compiler threads.
CompilerPool compilerPool;
// For the client, all port files fetched, one per started javac server.
// Though usually only one javac server is started by a client.
private static Map<String, PortFile> allPortFiles;
private static Map<String, Long> maxServerMemory;
final static int ERROR_FATAL = -1;
final static int ERROR_BUT_TRY_AGAIN = -4712;
final static String PROTOCOL_COOKIE_VERSION = "----THE-COOKIE-V2----";
final static String PROTOCOL_CWD = "----THE-CWD----";
final static String PROTOCOL_ID = "----THE-ID----";
final static String PROTOCOL_ARGS = "----THE-ARGS----";
final static String PROTOCOL_SOURCES_TO_COMPILE = "----THE-SOURCES-TO-COMPILE----";
final static String PROTOCOL_VISIBLE_SOURCES = "----THE-VISIBLE-SOURCES----";
final static String PROTOCOL_END = "----THE-END----";
final static String PROTOCOL_STDOUT = "----THE-STDOUT----";
final static String PROTOCOL_STDERR = "----THE-STDERR----";
final static String PROTOCOL_PACKAGE_ARTIFACTS = "----THE-PACKAGE_ARTIFACTS----";
final static String PROTOCOL_PACKAGE_DEPENDENCIES = "----THE-PACKAGE_DEPENDENCIES----";
final static String PROTOCOL_PACKAGE_PUBLIC_APIS = "----THE-PACKAGE-PUBLIC-APIS----";
final static String PROTOCOL_SYSINFO = "----THE-SYSINFO----";
final static String PROTOCOL_RETURN_CODE = "----THE-RETURN-CODE----";
// Check if the portfile is gone, every 5 seconds.
static int CHECK_PORTFILE_INTERVAL = 5;
// Wait 2 seconds for response, before giving up on javac server.
static int CONNECTION_TIMEOUT = 2;
static int WAIT_BETWEEN_CONNECT_ATTEMPTS = 1;
static int MAX_NUM_CONNECT_ATTEMPTS = 3;
/**
* Acquire the port file. Synchronized since several threads inside an smart javac wrapper client acquires the same port file at the same time.
*/
private static synchronized PortFile getPortFile(String filename) throws FileNotFoundException {
if (allPortFiles == null) {
allPortFiles = new HashMap<>();
}
PortFile pf = allPortFiles.get(filename);
if (pf == null) {
pf = new PortFile(filename);
allPortFiles.put(filename, pf);
}
return pf;
}
/**
* Get the cookie used for this server.
*/
long getCookie() {
return myCookie;
}
/**
* Get the port used for this server.
*/
int getPort() {
return serverSocket.getLocalPort();
}
/**
* Sum up the total build time for this javac server.
*/
public void addBuildTime(long inc) {
totalBuildTime += inc;
}
/**
* Log this message.
*/
public void log(String msg) {
if (theLog != null) {
theLog.println(msg);
} else {
System.err.println(msg);
}
}
/**
* Make sure the log is flushed.
*/
public void flushLog() {
if (theLog != null) {
theLog.flush();
}
}
/**
* Start a server using a settings string. Typically: "--startserver:portfile=/tmp/myserver,poolsize=3" and the string "portfile=/tmp/myserver,poolsize=3"
* is sent as the settings parameter. Returns 0 on success, -1 on failure.
*/
public static int startServer(String settings, PrintStream err) {
try {
String portfile = Util.extractStringOption("portfile", settings);
// The log file collects more javac server specific log information.
String logfile = Util.extractStringOption("logfile", settings);
// The stdouterr file collects all the System.out and System.err writes to disk.
String stdouterrfile = Util.extractStringOption("stdouterrfile", settings);
// We could perhaps use System.setOut and setErr here.
// But for the moment we rely on the client to spawn a shell where stdout
// and stderr are redirected already.
// The pool size is a limit the number of concurrent compiler threads used.
// The server might use less than these to avoid memory problems.
int poolsize = Util.extractIntOption("poolsize", settings);
if (poolsize <= 0) {
// If not set, default to the number of cores.
poolsize = Runtime.getRuntime().availableProcessors();
}
// How many seconds of inactivity will the server accept before quitting?
int keepalive = Util.extractIntOption("keepalive", settings);
if (keepalive <= 0) {
keepalive = 120;
}
// The port file is locked and the server port and cookie is written into it.
PortFile portFile = getPortFile(portfile);
JavacServer s;
synchronized (portFile) {
portFile.lock();
portFile.getValues();
if (portFile.containsPortInfo()) {
err.println("Javac server not started because portfile exists!");
portFile.unlock();
return -1;
}
s = new JavacServer(poolsize, logfile);
portFile.setValues(s.getPort(), s.getCookie());
portFile.unlock();
}
// Run the server. Will delete the port file when shutting down.
// It will shut down automatically when no new requests have come in
// during the last 125 seconds.
s.run(portFile, err, keepalive);
// The run loop for the server has exited.
return 0;
} catch (Exception e) {
e.printStackTrace(err);
return -1;
}
}
/**
* Dispatch a compilation request to a javac server.
*
* @param args are the command line args to javac and is allowed to contain source files, @file and other command line options to javac.
*
* The generated classes, h files and other artifacts from the javac invocation are stored by the javac server to disk.
*
* @param sources_to_compile The sources to compile.
*
* @param visibleSources If visible sources has a non zero size, then visible_sources are the only files in the file system that the javac server can see!
* (Sources to compile are always visible.) The visible sources are those supplied by the (filtered) -sourcepath
*
* @param visibleClasses If visible classes for a specific root/jar has a non zero size, then visible_classes are the only class files that the javac server
* can see, in that root/jar. It maps from a classpath root or a jar file to the set of visible classes for that root/jar.
*
* The server return meta data about the build in the following parameters.
* @param package_artifacts, map from package name to set of created artifacts for that package.
* @param package_dependencies, map from package name to set of packages that it depends upon.
* @param package_pubapis, map from package name to unique string identifying its pub api.
*/
public static int useServer(String settings, String[] args,
Set<URI> sourcesToCompile,
Set<URI> visibleSources,
Map<URI, Set<String>> visibleClasses,
Map<String, Set<URI>> packageArtifacts,
Map<String, Set<String>> packageDependencies,
Map<String, String> packagePubapis,
SysInfo sysinfo,
PrintStream out,
PrintStream err) {
try {
// The id can perhaps be used in the future by the javac server to reuse the
// JavaCompiler instance for several compiles using the same id.
String id = Util.extractStringOption("id", settings);
String portfile = Util.extractStringOption("portfile", settings);
String logfile = Util.extractStringOption("logfile", settings);
String stdouterrfile = Util.extractStringOption("stdouterrfile", settings);
String background = Util.extractStringOption("background", settings);
if (background == null || !background.equals("false")) {
background = "true";
}
// The sjavac option specifies how the server part of sjavac is spawned.
// If you have the experimental sjavac in your path, you are done. If not, you have
// to point to a com.sun.tools.sjavac.Main that supports --startserver
// for example by setting: sjavac=java%20-jar%20...javac.jar%com.sun.tools.sjavac.Main
String sjavac = Util.extractStringOption("sjavac", settings);
int poolsize = Util.extractIntOption("poolsize", settings);
int keepalive = Util.extractIntOption("keepalive", settings);
if (keepalive <= 0) {
// Default keepalive for server is 120 seconds.
// I.e. it will accept 120 seconds of inactivity before quitting.
keepalive = 120;
}
if (portfile == null) {
err.println("No portfile was specified!");
return -1;
}
if (logfile == null) {
logfile = portfile + ".javaclog";
}
if (stdouterrfile == null) {
stdouterrfile = portfile + ".stdouterr";
}
// Default to sjavac and hope it is in the path.
if (sjavac == null) {
sjavac = "sjavac";
}
int attempts = 0;
int rc = -1;
do {
PortFile port_file = getPortFile(portfile);
synchronized (port_file) {
port_file.lock();
port_file.getValues();
port_file.unlock();
}
if (!port_file.containsPortInfo()) {
String cmd = fork(sjavac, port_file.getFilename(), logfile, poolsize, keepalive, err, stdouterrfile, background);
if (background.equals("true") && !port_file.waitForValidValues()) {
// Ouch the server did not start! Lets print its stdouterrfile and the command used.
printFailedAttempt(cmd, stdouterrfile, err);
// And give up.
return -1;
}
}
rc = connectAndCompile(port_file, id, args, sourcesToCompile, visibleSources,
packageArtifacts, packageDependencies, packagePubapis, sysinfo,
out, err);
// Try again until we manage to connect. Any error after that
// will cause the compilation to fail.
if (rc == ERROR_BUT_TRY_AGAIN) {
// We could not connect to the server. Try again.
attempts++;
try {
Thread.sleep(WAIT_BETWEEN_CONNECT_ATTEMPTS);
} catch (InterruptedException e) {
}
}
} while (rc == ERROR_BUT_TRY_AGAIN && attempts < MAX_NUM_CONNECT_ATTEMPTS);
return rc;
} catch (Exception e) {
e.printStackTrace(err);
return -1;
}
}
private static void printFailedAttempt(String cmd, String f, PrintStream err) {
err.println("---- Failed to start javac server with this command -----");
err.println(cmd);
try {
BufferedReader in = new BufferedReader(new FileReader(f));
err.println("---- stdout/stderr output from attempt to start javac server -----");
for (;;) {
String l = in.readLine();
if (l == null) {
break;
}
err.println(l);
}
err.println("------------------------------------------------------------------");
} catch (Exception e) {
err.println("The stdout/stderr output in file " + f + " does not exist and the server did not start.");
}
}
/**
* Spawn the server instance.
*/
private JavacServer(int poolSize, String logfile) throws IOException {
serverStart = System.currentTimeMillis();
// Create a server socket on a random port that is bound to the localhost/127.0.0.1 interface.
// I.e only local processes can connect to this port.
serverSocket = new ServerSocket(0, 128, InetAddress.getByName(null));
compilerPool = new CompilerPool(poolSize, this);
Random rnd = new Random();
myCookie = rnd.nextLong();
theLog = new PrintWriter(logfile);
log("Javac server started. port=" + getPort() + " date=" + (new java.util.Date()) + " with poolsize=" + poolSize);
flushLog();
}
/**
* Fork a background process. Returns the command line used that can be printed if something failed.
*/
private static String fork(String sjavac, String portfile, String logfile, int poolsize, int keepalive,
final PrintStream err, String stdouterrfile, String background)
throws IOException, ProblemException {
if (stdouterrfile != null && stdouterrfile.trim().equals("")) {
stdouterrfile = null;
}
final String startserver = "--startserver:portfile=" + portfile + ",logfile=" + logfile + ",stdouterrfile=" + stdouterrfile + ",poolsize=" + poolsize + ",keepalive="+ keepalive;
if (background.equals("true")) {
sjavac += "%20" + startserver;
sjavac = sjavac.replaceAll("%20", " ");
sjavac = sjavac.replaceAll("%2C", ",");
// If the java/sh/cmd launcher fails the failure will be captured by stdouterr because of the redirection here.
String[] cmd = {"/bin/sh", "-c", sjavac + " >> " + stdouterrfile + " 2>&1"};
if (!(new File("/bin/sh")).canExecute()) {
ArrayList<String> wincmd = new ArrayList<>();
wincmd.add("cmd");
wincmd.add("/c");
wincmd.add("start");
wincmd.add("cmd");
wincmd.add("/c");
wincmd.add(sjavac + " >> " + stdouterrfile + " 2>&1");
cmd = wincmd.toArray(new String[wincmd.size()]);
}
Process pp = null;
try {
pp = Runtime.getRuntime().exec(cmd);
} catch (Exception e) {
e.printStackTrace(err);
e.printStackTrace(new PrintWriter(stdouterrfile));
}
StringBuilder rs = new StringBuilder();
for (String s : cmd) {
rs.append(s + " ");
}
return rs.toString();
}
// Do not spawn a background server, instead run it within the same JVM.
Thread t = new Thread() {
@Override
public void run() {
try {
JavacServer.startServer(startserver, err);
} catch (Throwable t) {
t.printStackTrace(err);
}
}
};
t.start();
return "";
}
/**
* Expect this key on the next line read from the reader.
*/
private static boolean expect(BufferedReader in, String key) throws IOException {
String s = in.readLine();
if (s != null && s.equals(key)) {
return true;
}
return false;
}
/**
* Make a request to the server only to get the maximum possible heap size to use for compilations.
*
* @param port_file The port file used to synchronize creation of this server.
* @param id The identify of the compilation.
* @param out Standard out information.
* @param err Standard err information.
* @return The maximum heap size in bytes.
*/
public static SysInfo connectGetSysInfo(String serverSettings, PrintStream out, PrintStream err) {
SysInfo sysinfo = new SysInfo(-1, -1);
String id = Util.extractStringOption("id", serverSettings);
String portfile = Util.extractStringOption("portfile", serverSettings);
try {
PortFile pf = getPortFile(portfile);
useServer(serverSettings, new String[0],
new HashSet<URI>(),
new HashSet<URI>(),
new HashMap<URI, Set<String>>(),
new HashMap<String, Set<URI>>(),
new HashMap<String, Set<String>>(),
new HashMap<String, String>(),
sysinfo, out, err);
} catch (Exception e) {
e.printStackTrace(err);
}
return sysinfo;
}
/**
* Connect and compile using the javac server settings and the args. When using more advanced features, the sources_to_compile and visible_sources are
* supplied to the server and meta data is returned in package_artifacts, package_dependencies and package_pubapis.
*/
private static int connectAndCompile(PortFile portFile, String id, String[] args,
Set<URI> sourcesToCompile,
Set<URI> visibleSources,
Map<String, Set<URI>> packageArtifacts,
Map<String, Set<String>> packageDependencies,
Map<String, String> packagePublicApis,
SysInfo sysinfo,
PrintStream out,
PrintStream err) {
int rc = -3;
try {
int port = portFile.containsPortInfo() ? portFile.getPort() : 0;
if (port == 0) {
return ERROR_BUT_TRY_AGAIN;
}
long cookie = portFile.getCookie();
// Acquire the localhost/127.0.0.1 address.
InetAddress addr = InetAddress.getByName(null);
SocketAddress sockaddr = new InetSocketAddress(addr, port);
Socket sock = new Socket();
int timeoutMs = CONNECTION_TIMEOUT * 1000;
try {
sock.connect(sockaddr, timeoutMs);
} catch (java.net.ConnectException e) {
err.println("Could not connect to javac server found in portfile: " + portFile.getFilename() + " " + e);
return ERROR_BUT_TRY_AGAIN;
}
if (!sock.isConnected()) {
err.println("Could not connect to javac server found in portfile: " + portFile.getFilename());
return ERROR_BUT_TRY_AGAIN;
}
BufferedReader in = new BufferedReader(new InputStreamReader(sock.getInputStream()));
PrintWriter sockout = new PrintWriter(sock.getOutputStream());
sockout.println(PROTOCOL_COOKIE_VERSION);
sockout.println("" + cookie);
sockout.println(PROTOCOL_CWD);
sockout.println(System.getProperty("user.dir"));
sockout.println(PROTOCOL_ID);
sockout.println(id);
sockout.println(PROTOCOL_ARGS);
for (String s : args) {
StringBuffer buf = new StringBuffer();
String[] paths = s.split(File.pathSeparator);
int c = 0;
for (String path : paths) {
File f = new File(path);
if (f.isFile() || f.isDirectory()) {
buf.append(f.getAbsolutePath());
c++;
if (c < paths.length) {
buf.append(File.pathSeparator);
}
} else {
buf = new StringBuffer(s);
break;
}
}
sockout.println(buf.toString());
}
sockout.println(PROTOCOL_SOURCES_TO_COMPILE);
for (URI uri : sourcesToCompile) {
sockout.println(uri.toString());
}
sockout.println(PROTOCOL_VISIBLE_SOURCES);
for (URI uri : visibleSources) {
sockout.println(uri.toString());
}
sockout.println(PROTOCOL_END);
sockout.flush();
StringBuffer stdout = new StringBuffer();
StringBuffer stderr = new StringBuffer();
if (!expect(in, PROTOCOL_STDOUT)) {
return ERROR_FATAL;
}
// Load stdout
for (;;) {
String l = in.readLine();
if (l == null) {
return ERROR_FATAL;
}
if (l.equals(PROTOCOL_STDERR)) {
break;
}
stdout.append(l);
stdout.append('\n');
}
// Load stderr
for (;;) {
String l = in.readLine();
if (l == null) {
return ERROR_FATAL;
}
if (l.equals(PROTOCOL_PACKAGE_ARTIFACTS)) {
break;
}
stderr.append(l);
stderr.append('\n');
}
// Load the package artifacts
Set<URI> lastUriSet = null;
for (;;) {
String l = in.readLine();
if (l == null) {
return ERROR_FATAL;
}
if (l.equals(PROTOCOL_PACKAGE_DEPENDENCIES)) {
break;
}
if (l.length() > 1 && l.charAt(0) == '+') {
String pkg = l.substring(1);
lastUriSet = new HashSet<>();
packageArtifacts.put(pkg, lastUriSet);
} else if (l.length() > 1 && lastUriSet != null) {
lastUriSet.add(new URI(l.substring(1)));
}
}
// Load package dependencies
Set<String> lastPackageSet = null;
for (;;) {
String l = in.readLine();
if (l == null) {
return ERROR_FATAL;
}
if (l.equals(PROTOCOL_PACKAGE_PUBLIC_APIS)) {
break;
}
if (l.length() > 1 && l.charAt(0) == '+') {
String pkg = l.substring(1);
lastPackageSet = new HashSet<>();
packageDependencies.put(pkg, lastPackageSet);
} else if (l.length() > 1 && lastPackageSet != null) {
lastPackageSet.add(l.substring(1));
}
}
// Load package pubapis
Map<String, StringBuffer> tmp = new HashMap<>();
StringBuffer lastPublicApi = null;
for (;;) {
String l = in.readLine();
if (l == null) {
return ERROR_FATAL;
}
if (l.equals(PROTOCOL_SYSINFO)) {
break;
}
if (l.length() > 1 && l.charAt(0) == '+') {
String pkg = l.substring(1);
lastPublicApi = new StringBuffer();
tmp.put(pkg, lastPublicApi);
} else if (l.length() > 1 && lastPublicApi != null) {
lastPublicApi.append(l.substring(1));
lastPublicApi.append("\n");
}
}
for (String p : tmp.keySet()) {
assert (packagePublicApis.get(p) == null);
String api = tmp.get(p).toString();
packagePublicApis.put(p, api);
}
// Now reading the max memory possible.
for (;;) {
String l = in.readLine();
if (l == null) {
return ERROR_FATAL;
}
if (l.equals(PROTOCOL_RETURN_CODE)) {
break;
}
if (l.startsWith("num_cores=") && sysinfo != null) {
sysinfo.numCores = Integer.parseInt(l.substring(10));
}
if (l.startsWith("max_memory=") && sysinfo != null) {
sysinfo.maxMemory = Long.parseLong(l.substring(11));
}
}
String l = in.readLine();
if (l == null) {
err.println("No return value from the server!");
return ERROR_FATAL;
}
rc = Integer.parseInt(l);
out.print(stdout);
err.print(stderr);
} catch (Exception e) {
e.printStackTrace(err);
}
return rc;
}
/**
* Run the server thread until it exits. Either because of inactivity or because the port file has been deleted by someone else, or overtaken by some other
* javac server.
*/
private void run(PortFile portFile, PrintStream err, int keepalive) {
boolean fileDeleted = false;
long timeSinceLastCompile;
try {
// Every 5 second (check_portfile_interval) we test if the portfile has disappeared => quit
// Or if the last request was finished more than 125 seconds ago => quit
// 125 = seconds_of_inactivity_before_shutdown+check_portfile_interval
serverSocket.setSoTimeout(CHECK_PORTFILE_INTERVAL*1000);
for (;;) {
try {
Socket s = serverSocket.accept();
CompilerThread ct = compilerPool.grabCompilerThread();
ct.setSocket(s);
compilerPool.execute(ct);
flushLog();
} catch (java.net.SocketTimeoutException e) {
if (compilerPool.numActiveRequests() > 0) {
// Never quit while there are active requests!
continue;
}
// If this is the timeout after the portfile
// has been deleted by us. Then we truly stop.
if (fileDeleted) {
log("Quitting because of "+(keepalive+CHECK_PORTFILE_INTERVAL)+" seconds of inactivity!");
break;
}
// Check if the portfile is still there.
if (!portFile.exists()) {
// Time to quit because the portfile was deleted by another
// process, probably by the makefile that is done building.
log("Quitting because portfile was deleted!");
flushLog();
break;
}
// Check if portfile.stop is still there.
if (portFile.markedForStop()) {
// Time to quit because another process touched the file
// server.port.stop to signal that the server should stop.
// This is necessary on some operating systems that lock
// the port file hard!
log("Quitting because a portfile.stop file was found!");
portFile.delete();
flushLog();
break;
}
// Does the portfile still point to me?
if (!portFile.stillMyValues()) {
// Time to quit because another build has started.
log("Quitting because portfile is now owned by another javac server!");
flushLog();
break;
}
// Check how long since the last request finished.
long diff = System.currentTimeMillis() - compilerPool.lastRequestFinished();
if (diff < keepalive * 1000) {
// Do not quit if we have waited less than 120 seconds.
continue;
}
// Ok, time to quit because of inactivity. Perhaps the build
// was killed and the portfile not cleaned up properly.
portFile.delete();
fileDeleted = true;
log("" + keepalive + " seconds of inactivity quitting in "
+ CHECK_PORTFILE_INTERVAL + " seconds!");
flushLog();
// Now we have a second 5 second grace
// period where javac remote requests
// that have loaded the data from the
// recently deleted portfile can connect
// and complete their requests.
}
}
} catch (Exception e) {
e.printStackTrace(err);
e.printStackTrace(theLog);
flushLog();
} finally {
compilerPool.shutdown();
}
long realTime = System.currentTimeMillis() - serverStart;
log("Shutting down.");
log("Total wall clock time " + realTime + "ms build time " + totalBuildTime + "ms");
flushLog();
}
public static void cleanup(String... args) {
String settings = Util.findServerSettings(args);
if (settings == null) return;
String portfile = Util.extractStringOption("portfile", settings);
String background = Util.extractStringOption("background", settings);
if (background != null && background.equals("false")) {
// If the server runs within this jvm, then delete the portfile,
// since this jvm is about to exit soon.
File f = new File(portfile);
f.delete();
}
}
}