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// Portions Copyright [2016] [Payara Foundation]
package com.sun.enterprise.web;
import com.sun.enterprise.config.serverbeans.*;
import com.sun.enterprise.config.serverbeans.VirtualServer;
import com.sun.enterprise.util.io.FileUtils;
import com.sun.enterprise.web.accesslog.AccessLogFormatter;
import com.sun.enterprise.web.accesslog.CombinedAccessLogFormatterImpl;
import com.sun.enterprise.web.accesslog.CommonAccessLogFormatterImpl;
import com.sun.enterprise.web.accesslog.DefaultAccessLogFormatterImpl;
import com.sun.enterprise.web.pluggable.WebContainerFeatureFactory;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.BufferOverflowException;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.channels.FileChannel;
import java.nio.charset.Charset;
import java.text.MessageFormat;
import java.text.SimpleDateFormat;
import java.util.*;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.apache.catalina.*;
import org.apache.catalina.valves.ValveBase;
import org.glassfish.api.admin.ServerEnvironment;
import org.glassfish.hk2.api.ServiceLocator;
import org.glassfish.internal.api.LogManager;
import org.glassfish.logging.annotation.LogMessageInfo;
/**
* <p>Implementation of the <b>Valve</b> interface that generates a web server
* access log with the detailed line contents matching a configurable pattern.
* The syntax of the available patterns is similar to that supported by the
* Apache <code>mod_log_config</code> module. As an additional feature,
* automatic rollover of log files at a specified interval is also supported.
*
* </p>This class uses a direct <code>ByteBuffer</code> to store and write
* logs.
*
* @author Jean-Francois Arcand
* @author Charlie J. Hunt
*/
public final class PEAccessLogValve
extends ValveBase
implements Runnable {
private static final Logger _logger = com.sun.enterprise.web.WebContainer.logger;
private static final ResourceBundle _rb = _logger.getResourceBundle();
private final LogManager logManager = org.glassfish.internal.api.Globals.get(LogManager.class);
@LogMessageInfo(
message = "Unable to write access log file {0}",
level = "SEVERE",
cause = "An exception occurred writing to access log file",
action = "Check the exception for the error")
public static final String ACCESS_LOG_UNABLE_TO_WRITE = "AS-WEB-GLUE-00098";
@LogMessageInfo(
message = "Setting accesslog directory for virtual server '{0}' to {1}",
level = "FINE")
public static final String ACCESS_LOG_DIRECTORY_SET = "AS-WEB-GLUE-00099";
@LogMessageInfo(
message = "Invalid accessLogWriterInterval value [{0}]",
level = "WARNING")
public static final String INVALID_ACCESS_LOG_WRITER_INTERVAL = "AS-WEB-GLUE-00100";
@LogMessageInfo(
message = "Invalid accessLogBufferSize value [{0}]",
level = "WARNING")
public static final String INVALID_ACCESS_LOG_BUFFER_SIZE = "AS-WEB-GLUE-00101";
@LogMessageInfo(
message = "Unable to parse max-history-files access log configuration [{0}]",
level = "WARNING")
public static final String INVALID_MAX_HISTORY_FILES = "AS-WEB-GLUE-00102";
@LogMessageInfo(
message = "Unable to create {0}",
level = "WARNING")
public static final String UNABLE_TO_CREATE = "AS-WEB-GLUE-00103";
@LogMessageInfo(
message = "Unable to rename access log file {0} to {1}",
level = "WARNING")
public static final String UNABLE_TO_RENAME_LOG_FILE = "AS-WEB-GLUE-00104";
@LogMessageInfo(
message = "Unable to remove access log file {0}",
level = "WARNING")
public static final String UNABLE_TO_REMOVE_LOG_FILE = "AS-WEB-GLUE-00105";
@LogMessageInfo(
message = "Access logger has already been started",
level = "WARNING")
public static final String ACCESS_LOG_ALREADY_STARTED = "AS-WEB-GLUE-00106";
@LogMessageInfo(
message = "Access logger has not yet been started",
level = "WARNING")
public static final String ACCESS_LOG_NOT_STARTED = "AS-WEB-GLUE-00107";
// Predefined patterns
private static final String COMMON_PATTERN = "common";
private static final String COMBINED_PATTERN = "combined";
/**
* Name of the system property whose value specifies the max number of
* access log history files to keep.
* If this property has been specified without any value, a default value
* of 10 is used.
* Else, if it has been specified with a value of 0, no access log
* history files will be maintained, and the current access log file will
* be reset after each rotation.
* If undefined, all access log history files will be preserved.
*/
private static final String LOGGING_MAX_HISTORY_FILES =
"com.sun.enterprise.server.logging.max_history_files";
/**
* The minimum size a buffer can have.
*/
private final static int MIN_BUFFER_SIZE = 5120;
// ----------------------------------------------------- Instance Variables
/**
* The directory in which log files are created.
*/
private String directory = "logs";
/**
* The descriptive information about this implementation.
*/
private static final String info =
"com.sun.enterprise.web.PEAccessLogValve/1.0";
/**
* The prefix that is added to log file filenames.
*/
private String prefix = "";
/**
* Should we rotate our log file?
*/
private boolean rotatable;
/**
* The suffix that is added to log file filenames.
*/
private String suffix = "";
/**
* If prefix ends in '.', and suffix starts with '.', we must remove the
* leading '.' from suffix when prefix and suffix are concatenated.
*/
private boolean removeLeadingDotFromSuffix = false;
/**
* Suffix from which leading '.' has been removed if
* removeLeadingDotFromSuffix is true
*/
private String dotLessSuffix = null;
/**
* ThreadLocal for a date formatter to format a Date into a date in the format
* "yyyy-MM-dd".
*/
private volatile ThreadLocal<SimpleDateFormat> dateFormatter = null;
/**
* Resolve hosts.
*/
private boolean resolveHosts = false;
/**
* Instant when the log daily rotation was last checked.
*/
private long lastAccessLogCreationTime = 0L;
/**
* Are we doing conditional logging. default false.
*/
private String condition = null;
/**
* Date format to place in log file name. Use at your own risk!
*/
private String fileDateFormat = null;
/**
* The <code>FileChannel</code> used to write the access log.
*/
private FileChannel fileChannel;
/**
* The stream used to store the logs.
*/
FileOutputStream fos;
/**
* The interval (in seconds) between writing the logs
*/
private int writeInterval = 0;
/**
* The interval between rotating the logs
*/
private int rotationInterval;
/**
* The background writerThread.
*/
private Thread writerThread = null;
/**
* The background writerThread completion semaphore.
*/
private boolean threadDone = false;
/**
* The <code>CharBuffer</code> used to store the logs.
*/
private CharBuffer charBuffer;
/**
* The <code>byteBuffer</code> used to store the log.
*/
private int bufferSize = MIN_BUFFER_SIZE;
/**
* If the writer interval is equals to zero, then always flush the
* direct byte buffer after every request.
*/
private boolean flushRealTime = true;
/**
* access log to console
*/
private boolean accessLogToConsole = false;
/**
* Are we supposed to add datestamp to first access log file we create,
* or only after first rotation?
*
* If set to false, the current access log file will never have any
* date stamp: It will be moved to a date-stamped file upon rotation
*/
private boolean addDateStampToFirstAccessLogFile;
/**
* The current access log file.
*/
private File logFile;
/**
* The maximum number of access log history files to keep
*/
private int maxHistoryFiles;
/**
* True if no access log history files are to be kept, false otherwise
*/
private boolean deleteAllHistoryFiles;
/**
* List of most recent access log history files (the size of this list
* is not to exceed <code>maxHistoryFiles</code>)
*/
private LinkedList<File> historyFiles;
/**
* The access log formatter
*/
private AccessLogFormatter formatter;
/**
* Simple lock
*/
private Object lock = new Object();
/**
* Return writerThread interval (seconds)
*/
public int getWriterInterval() {
return writeInterval;
}
/**
* Set writerthread interval (seconds)
*/
public void setWriterInterval(int t) {
if ( t > 0 ){
flushRealTime = false;
}
else {
flushRealTime = true;
}
writeInterval = t;
}
/**
* Return rotation interval
*/
public int geRotationInterval() {
return rotationInterval;
}
/**
* Set rotation interval
*/
public void setRotationInterval(int t) {
rotationInterval = t;
}
/**
* Set the direct <code>ByteBuffer</code> size
*/
public void setBufferSize(int size){
if ( size > 0 && writeInterval != 0){
flushRealTime = false;
}
if (size < MIN_BUFFER_SIZE) {
bufferSize = MIN_BUFFER_SIZE;
} else {
bufferSize = size;
}
}
/**
* Return the direct <code>ByteBuffer</code> size
*/
public int getBufferSize(){
return bufferSize;
}
// ------------------------------------------------------------- Properties
/**
* Are we supposed to add datestamp to first access log file we create,
* or only starting with first rotation?
*/
public void setAddDateStampToFirstAccessLogFile(boolean add) {
addDateStampToFirstAccessLogFile = add;
}
/**
* Return the directory in which we create log files.
*/
public String getDirectory() {
return directory;
}
/**
* Set the directory in which we create log files.
*
* @param directory The new log file directory
*/
public void setDirectory(String directory) {
this.directory = directory;
}
/**
* Return descriptive information about this implementation.
*/
public String getInfo() {
return info;
}
/**
* Set the format pattern, first translating any recognized alias.
*
* @param p The new pattern
*/
public void setPattern(String p) {
if (COMMON_PATTERN.equalsIgnoreCase(p)) {
formatter = new CommonAccessLogFormatterImpl();
} else if (COMBINED_PATTERN.equalsIgnoreCase(p)) {
formatter = new CombinedAccessLogFormatterImpl();
} else {
formatter = new DefaultAccessLogFormatterImpl(p, getContainer());
}
}
/**
* Return the log file prefix.
*/
public String getPrefix() {
return prefix;
}
/**
* Set the log file prefix.
*
* @param p prefix The new log file prefix
*/
public void setPrefix(String p) {
prefix = p;
if (prefix != null && suffix != null && prefix.endsWith(".")
&& suffix.startsWith(".")) {
removeLeadingDotFromSuffix = true;
dotLessSuffix = suffix.substring(1);
} else {
removeLeadingDotFromSuffix = false;
}
}
/**
* Should we rotate the logs
*/
public boolean isRotatable() {
return rotatable;
}
/**
* Set the value is we should we rotate the logs
*
* @param rotatable true is we should rotate.
*/
public void setRotatable(boolean rotatable) {
this.rotatable = rotatable;
}
/**
* Return the log file suffix.
*/
public String getSuffix() {
return suffix;
}
/**
* Set the log file suffix.
*
* @param s suffix The new log file suffix
*/
public void setSuffix(String s) {
suffix = s;
if (prefix != null && suffix != null && prefix.endsWith(".")
&& suffix.startsWith(".")) {
removeLeadingDotFromSuffix = true;
dotLessSuffix = suffix.substring(1);
} else {
removeLeadingDotFromSuffix = false;
}
}
/**
* Set the resolve hosts flag.
*
* @param resolveHosts The new resolve hosts value
*/
public void setResolveHosts(boolean resolveHosts) {
this.resolveHosts = resolveHosts;
}
/**
* Get the value of the resolve hosts flag.
*/
public boolean isResolveHosts() {
return resolveHosts;
}
/**
* Return whether the attribute name to look for when
* performing conditional loggging. If null, every
* request is logged.
*/
public String getCondition() {
return condition;
}
/**
* Set the ServletRequest.attribute to look for to perform
* conditional logging. Set to null to log everything.
*
* @param condition Set to null to log everything
*/
public void setCondition(String condition) {
this.condition = condition;
}
/**
* Return the date format date based log rotation.
*/
public String getFileDateFormat() {
return fileDateFormat;
}
/**
* Set the date format date based log rotation.
*/
public void setFileDateFormat(String fileDateFormat) {
this.fileDateFormat = fileDateFormat;
}
// --------------------------------------------------------- Public Methods
/**
* Log a message summarizing the specified request and response, according
* to the format specified by the <code>pattern</code> property.
*
* @param request Request being processed
* @param response Response being processed
*/
public int invoke(Request request, Response response) {
if (formatter!=null && formatter.needTimeTaken()) {
request.setNote(Constants.REQUEST_START_TIME_NOTE, System.currentTimeMillis());
}
return INVOKE_NEXT;
}
public void postInvoke(Request request, Response response)
throws IOException {
if (!started || condition!=null &&
null!=request.getRequest().getAttribute(condition)) {
return;
}
synchronized (lock){
// Reset properly the buffer in case of an unexpected
// exception.
if (charBuffer.position() == charBuffer.limit()){
charBuffer.limit(charBuffer.capacity());
}
int pos = charBuffer.position();
// We've flushed our buffer to make room for the current request.
// Now process the current request
for (int i=0; i < 2; i++){
try {
if (formatter!=null) {
formatter.appendLogEntry(request, response, charBuffer);
charBuffer.put("\n");
if (flushRealTime){
log();
}
break;
}
} catch (BufferOverflowException ex) {
charBuffer.position(pos);
log();
if (i+1 == 2){
_logger.log(
Level.SEVERE,
ACCESS_LOG_UNABLE_TO_WRITE,
new Object[] {ex});
return;
}
}
}
}
}
/**
* Log the specified message to the log file, switching files if the date
* has changed since the previous log call.
*/
public void log() throws IOException {
if (rotatable){
long systime = System.currentTimeMillis();
long rotationIntervalLong = rotationInterval*1000L;
if (systime-lastAccessLogCreationTime > rotationIntervalLong) {
synchronized (this) {
systime = System.currentTimeMillis();
if (systime-lastAccessLogCreationTime >
rotationIntervalLong) {
// Rotate only if the formatted datestamps are
// different
String lastDateStamp = dateFormatter.get().format(
new Date(lastAccessLogCreationTime));
String newDateStamp = dateFormatter.get().format(
new Date(systime));
lastAccessLogCreationTime = systime;
if (!lastDateStamp.equals(newDateStamp)) {
close();
open(newDateStamp, false);
}
}
}
}
}
synchronized(lock){
try{
charBuffer.flip();
String bufString = charBuffer.toString();
if (accessLogToConsole && !bufString.isEmpty()) {
logManager.getOutStream().print(bufString.replaceAll("(?m)^", "AccessLog: "));
}
ByteBuffer byteBuffer =
ByteBuffer.wrap(bufString.getBytes(Charset.defaultCharset()));
while (byteBuffer.hasRemaining()){
fileChannel.write(byteBuffer);
}
} catch (IOException ex){
;
} finally {
charBuffer.clear();
}
}
}
/*
* Configures this access log valve.
*
* @param vs The virtual server instance
* @param vsId The virtual server id
* @param vsBean The virtual server bean containing info about the access
* log
*
* @return true if this access log valve needs to be started, false
* otherwise
*/
boolean configure(String vsId, VirtualServer vsBean,
HttpService httpService, Domain domain, ServiceLocator habitat,
WebContainerFeatureFactory fac, String globalAccessLogBufferSize,
String globalAccessLogWriteInterval) {
setPrefix(vsId + fac.getDefaultAccessLogPrefix());
boolean start = updateVirtualServerProperties(
vsId, vsBean, domain, habitat, globalAccessLogBufferSize,
globalAccessLogWriteInterval);
updateAccessLogAttributes(httpService, fac);
return start;
}
/**
* Configures this accesslog valve with the accesslog related properties
* of the given <virtual-server> bean.
*/
boolean updateVirtualServerProperties(
String vsId,
VirtualServer vsBean,
Domain domain,
ServiceLocator services,
String accessLogBufferSize,
String accessLogWriteInterval) {
/*
* Determine the virtual server's access log directory, which may be
* specified in two places:
*
* 1. <virtual-server>
* <http-access-log log-directory="..."/>
* </virtual-server>
*
* 2. <virtual-server>
* <property name="accesslog" value="..."/>
* </virtual-server>
*
* If both have been specified, the latter takes precedence.
*/
String accessLog = vsBean.getAccessLog();
if (accessLog==null && vsBean.getHttpAccessLog() != null) {
accessLog = vsBean.getHttpAccessLog().getLogDirectory();
}
if (accessLog == null) {
return false;
}
File dir = new File(accessLog);
if (!dir.isAbsolute()) {
/*
* If accesslog is relative, turn it into an absolute path by
* prepending log-root of domain element
*/
String logRoot = domain.getLogRoot();
if (logRoot != null) {
dir = new File(logRoot, accessLog);
} else {
ServerEnvironment env = services.getService(ServerEnvironment.class);
dir = new File(env.getDomainRoot(), accessLog);
}
}
if (_logger.isLoggable(Level.FINE)) {
_logger.log(Level.FINE,
ACCESS_LOG_DIRECTORY_SET,
new Object[]{vsId, dir.getAbsolutePath()});
}
setDirectory(dir.getAbsolutePath());
/*
* If there is any accessLogWriteInterval property defined under
* <virtual-server>, it overrides the write-interval-seconds attribute
* of <http-service><access-log>
*/
String acWriteInterval = vsBean.getPropertyValue(
Constants.ACCESS_LOG_WRITE_INTERVAL_PROPERTY,
accessLogWriteInterval);
if (acWriteInterval != null) {
try{
setWriterInterval(Integer.parseInt(acWriteInterval));
} catch (NumberFormatException ex){
_logger.log(Level.WARNING,
INVALID_ACCESS_LOG_WRITER_INTERVAL,
acWriteInterval);
}
}
/*
* If there is any accessLogBufferSize property defined under
* <virtual-server>, it overrides the buffer-size-bytes attribute
* of <http-service><access-log>
*/
String acBufferSize = vsBean.getPropertyValue(
Constants.ACCESS_LOG_BUFFER_SIZE_PROPERTY, accessLogBufferSize);
if (acBufferSize != null) {
try {
setBufferSize(Integer.parseInt(acBufferSize));
} catch (NumberFormatException ex){
_logger.log(Level.WARNING,
INVALID_ACCESS_LOG_BUFFER_SIZE,
acBufferSize);
}
}
return true;
}
/**
* Configures this accesslog valve with the accesslog related
* attributes of the domain.xml's <http-service> and <access-log>
* elements.
*/
void updateAccessLogAttributes(HttpService httpService,
WebContainerFeatureFactory fac) {
setResolveHosts(false);
AccessLog accessLogConfig = httpService.getAccessLog();
// access-log format
String format = null;
if (accessLogConfig != null) {
format = accessLogConfig.getFormat();
} else {
format = ConfigBeansUtilities.getDefaultFormat();
}
setPattern(format);
// write-interval-seconds
int interval = 0;
if (accessLogConfig != null) {
String s = accessLogConfig.getWriteIntervalSeconds();
interval = Integer.parseInt(s);
setWriterInterval(interval);
}
// rotation-enabled
if (accessLogConfig != null) {
setRotatable(Boolean.valueOf(accessLogConfig.getRotationEnabled()));
} else {
setRotatable(Boolean.valueOf(
ConfigBeansUtilities.getDefaultRotationEnabled()));
}
// rotation-interval
interval = 0;
if (accessLogConfig != null) {
String s = accessLogConfig.getRotationIntervalInMinutes();
interval = Integer.parseInt(s) * 60;
} else {
interval = Integer.parseInt(ConfigBeansUtilities.getDefaultRotationIntervalInMinutes()) * 60;
}
setRotationInterval(interval);
// rotation-datestamp
String rotationDateStamp = null;
if (accessLogConfig != null) {
rotationDateStamp = accessLogConfig.getRotationSuffix();
} else {
rotationDateStamp = fac.getDefaultAccessLogDateStampPattern();
}
if ("%YYYY;%MM;%DD;-%hh;h%mm;m%ss;s".equals(rotationDateStamp)) {
/*
* Modify the default rotation suffix pattern specified in the
* sun-domain DTD in such a way that it is accepted by
* java.text.SimpleDateFormat. We support only those patterns
* accepted by java.text.SimpleDateFormat.
*/
rotationDateStamp = "yyyyMMdd-HH'h'mm'm'ss's'";
}
setFileDateFormat(rotationDateStamp);
// rotation-suffix
setSuffix(fac.getDefaultAccessLogSuffix());
setAddDateStampToFirstAccessLogFile(
fac.getAddDateStampToFirstAccessLogFile());
// max-history-files
deleteAllHistoryFiles = false;
historyFiles = null;
maxHistoryFiles = 10;
String prop = System.getProperty(LOGGING_MAX_HISTORY_FILES);
if (prop != null) {
if (!"".equals(prop)) {
try {
maxHistoryFiles = Integer.parseInt(prop);
} catch (NumberFormatException e) {
String msg = MessageFormat.format(_rb.getString(INVALID_MAX_HISTORY_FILES), prop);
_logger.log(Level.WARNING, msg, e);
}
}
} else {
try {
maxHistoryFiles = Integer.parseInt(
accessLogConfig.getMaxHistoryFiles());
} catch (NumberFormatException e) {
String msg = MessageFormat.format(_rb.getString(INVALID_MAX_HISTORY_FILES),
accessLogConfig.getMaxHistoryFiles());
_logger.log(Level.WARNING, msg, e);
}
}
if (maxHistoryFiles == 0) {
deleteAllHistoryFiles = true;
} else if (maxHistoryFiles > 0) {
historyFiles = new LinkedList<File>();
}
// log to console
accessLogToConsole = Boolean.parseBoolean(accessLogConfig.getLogToConsoleEnabled());
}
// -------------------------------------------------------- Private Methods
/**
* Close the currently open log file (if any)
*/
private synchronized void close() {
try{
// Make sure the byteBuffer is clean
log();
fileChannel.close();
fos.close();
} catch (IOException ex){
;
}
}
/**
* Open new access log file.
*
* @param dateStamp The date stamp of the new access log file (if log
* rotation has been enabled)
* @param firstAccessLogFile true if we are creating our first access log
* file, and false if we have rotated
*/
private synchronized void open(String dateStamp,
boolean firstAccessLogFile)
throws IOException {
// Create the directory if necessary
File dir = new File(directory);
if (!dir.isAbsolute())
dir = new File(System.getProperty("catalina.base"), directory);
if (!FileUtils.mkdirsMaybe(dir)) {
_logger.log(Level.WARNING,
UNABLE_TO_CREATE,
dir.toString());
}
// Open the current log file
try {
String pathname;
// If no rotate - no need for dateStamp in fileName
if (rotatable && addDateStampToFirstAccessLogFile) {
pathname = dir.getAbsolutePath() + File.separator +
prefix + dateStamp + suffix;
} else {
if (removeLeadingDotFromSuffix) {
pathname = dir.getAbsolutePath() + File.separator +
prefix + dotLessSuffix;
} else {
pathname = dir.getAbsolutePath() + File.separator +
prefix + suffix;
}
}
if (rotatable
&& !addDateStampToFirstAccessLogFile
&& !firstAccessLogFile) {
// Move current access log file, which has no date stamp,
// to date-stamped file
String dateStampedPathname = dir.getAbsolutePath()
+ File.separator
+ prefix + dateStamp + suffix;
File renameToFile = new File(dateStampedPathname);
if (!logFile.renameTo(renameToFile)) {
_logger.log(
Level.WARNING,
UNABLE_TO_RENAME_LOG_FILE,
new Object[] {logFile.toString(), dateStampedPathname });
}
File removeFile = null;
if (deleteAllHistoryFiles) {
removeFile = renameToFile;
} else {
if (historyFiles != null) {
historyFiles.addLast(renameToFile);
if (historyFiles.size() > maxHistoryFiles) {
removeFile = historyFiles.removeFirst();
}
}
}
if (removeFile != null && !removeFile.delete()) {
_logger.log(Level.WARNING,
UNABLE_TO_REMOVE_LOG_FILE,
removeFile.toString());
}
}
// Open the file and then get a channel from the stream
logFile = new File(pathname);
fos = new FileOutputStream(logFile, true);
fileChannel = fos.getChannel();
} catch (IOException ioe) {
try {
if ( fileChannel != null ) {
fileChannel.close();
}
} catch (IOException e){
;
}
// Rethrow IOException
throw ioe;
}
}
// ------------------------------------------------------ Lifecycle Methods
/**
* Add a lifecycle event listener to this component.
*
* @param listener The listener to add
*/
public void addLifecycleListener(LifecycleListener listener) {
lifecycle.addLifecycleListener(listener);
}
/**
* Gets the (possibly empty) list of lifecycle listeners associated
* with this PEAccessLogValve.
*/
public List<LifecycleListener> findLifecycleListeners() {
return lifecycle.findLifecycleListeners();
}
/**
* Remove a lifecycle event listener from this component.
*
* @param listener The listener to add
*/
public void removeLifecycleListener(LifecycleListener listener) {
lifecycle.removeLifecycleListener(listener);
}
/**
* Prepare for the beginning of active use of the public methods of this
* component. This method should be called after <code>configure()</code>,
* and before any of the public methods of the component are utilized.
*
* @exception LifecycleException if this component detects a fatal error
* that prevents this component from being used
*/
public void start() throws LifecycleException {
// Validate and update our current component state
if (started) {
throw new LifecycleException(_rb.getString(ACCESS_LOG_ALREADY_STARTED));
}
lifecycle.fireLifecycleEvent(START_EVENT, null);
if (bufferSize <= MIN_BUFFER_SIZE) {
bufferSize = MIN_BUFFER_SIZE;
}
charBuffer = CharBuffer.allocate(bufferSize);
// Initialize the timeZone, Date formatters, and currentDate
final TimeZone tz = TimeZone.getDefault();
if (fileDateFormat==null || fileDateFormat.length()==0)
fileDateFormat = "yyyy-MM-dd";
dateFormatter = new ThreadLocal<SimpleDateFormat>() {
@Override
protected SimpleDateFormat initialValue() {
SimpleDateFormat f = new SimpleDateFormat(fileDateFormat);
f.setTimeZone(tz);
return f;
}
};
long systime = System.currentTimeMillis();
try {
open(dateFormatter.get().format(new Date(systime)), true);
} catch (IOException ioe) {
throw new LifecycleException(ioe);
}
lastAccessLogCreationTime = systime;
if (!flushRealTime){
// Start the background writer writerThread
threadStart();
}
started = true;
}
/**
* Gracefully terminate the active use of the public methods of this
* component. This method should be the last one called on a given
* instance of this component.
*
* @exception LifecycleException if this component detects a fatal error
* that needs to be reported
*/
public void stop() throws LifecycleException {
// Validate and update our current component state
if (!started) {
throw new LifecycleException(_rb.getString(ACCESS_LOG_NOT_STARTED));
}
lifecycle.fireLifecycleEvent(STOP_EVENT, null);
started = false;
if (!flushRealTime){
// Stop the background writer thread
threadStop();
}
close();
}
/**
* The background writerThread that checks for write the log.
*/
public void run() {
// Loop until the termination semaphore is set
while (!threadDone) {
threadSleep();
try {
log();
} catch (IOException ioe) {
threadDone = true;
}
}
}
/**
* Sleep for the duration specified by the <code>writeInterval</code>
* property.
*/
private void threadSleep() {
if (writerThread == null || writeInterval == 0)
return;
try {
writerThread.sleep(writeInterval * 1000L);
} catch (InterruptedException e) {
;
}
}
/**
* Start the background writerThread that will periodically write access log
*/
private void threadStart() {
if (writerThread != null || writeInterval == 0)
return;
threadDone = false;
String threadName = "AccessLogWriter";
writerThread = new Thread(this, threadName);
writerThread.setDaemon(true);
writerThread.start();
}
/**
* Stop the background writerThread that is periodically write logs
*/
private void threadStop() {
if (writerThread == null || writeInterval == 0)
return;
threadDone = true;
writerThread.interrupt();
try {
writerThread.join();
} catch (InterruptedException e) {
;
}
writerThread = null;
}
}