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/*************************************************
*
* = PACKAGE
* netsvcs.Logger
*
* = FILENAME
* LogRecord.java
*
*@author Chris Cleeland, Everett Anderson
*
*************************************************/
package netsvcs.Logger;
import java.util.Date;
import java.io.DataOutputStream;
import java.io.DataInputStream;
import java.io.PrintStream;
import java.io.IOException;
import JACE.OS.*;
/**
*
* <p><h2>DESCRIPTION</h2>
*
* <blockquote>
* Communicates logging information. Compatible with the C++ ACE
* ACE_Log_Record class.
*
*/
public class LogRecord
{
final public int MAXLOGMSGLEN = 4 * 1024;
private int type_;
private int length_;
private long msec_;
private int pid_;
private byte[] msgData_;
private final static int numIntMembers = 5;
private final static int sizeofIntInBytes = 4;
/**
* Create a default instance.
*/
public LogRecord()
{
type(0);
timeStamp((int)new Date().getTime());
length(0);
pid(0);
}
/**
* Create a LogRecord. This is the designated initializer.
* @param priority a numeric specification of the priority (ascending)
* @param milliseconds time attached to the log entry in Unix <pre>time_t</pre> format
* @param pid the process ID; not currently used
*/
public LogRecord(int priority,
long milliseconds,
int pid)
{
type(priority);
timeStamp(milliseconds);
length(0);
pid(pid);
}
/**
* Conversion to string. Only includes the <pre>msgData_</pre> member.
*/
public String toString()
{
return new String(msgData_);
}
/**
* Place a textual representation of the record on a PrintStream.
* @param hostname name of the host generating this record
* @param verbose if <b>true</b>, print information in the form, (give example)
* @param ps A PrintStream instance to which the output should go.
* @see PrintStream,String
*/
public void print(String hostname,
boolean verbose,
PrintStream ps)
{
String toprint;
if (verbose)
{
Date now = new Date(this.timeStamp());
/* 01234567890123456789012345 */
/* Wed Oct 18 14:25:36 1989n0 */
toprint = now.toString().substring(4) + "@"
+ hostname + "@" + pid_ + "@" + type_ + "@"
+ this.toString();
}
else
{
toprint = this.toString();
}
ps.println(toprint);
}
/**
* Streaming methods
*/
public void streamInFrom(DataInputStream dis) throws IOException
{
// Order here must match layout order in the C++ class.
// This, of course, is VERY fragile, and ought not be used as
// a model for anything except how NOT to do anything.
length(dis.readInt());
type(dis.readInt());
this.timeStamp((long)dis.readInt() * 1000);
// Skip smaller time resolution info since we're lucky if Java's
// timer can handle more than millisecond precision, anyway
dis.skipBytes(4);
pid(dis.readInt());
// Does readFully() allocate space for the buffer? Either
// way, we won't have memory leaks :-)
int dataLength = (int) (length_ - numIntMembers * sizeofIntInBytes);
msgData_ = new byte[dataLength];
dis.readFully(msgData_, 0, dataLength);
}
public void streamOutTo(DataOutputStream dos) throws IOException
{
dos.writeInt(length());
dos.writeInt(type());
dos.writeInt((int)(this.msec_ / 1000));
dos.writeInt(0);
dos.writeInt(pid());
dos.write(msgData_);
}
/**
* Accessor methods
*/
public int type() { return type_; }
public void type(int t) { type_ = t; }
public int length() { return length_; }
public void length(int l) { length_ = l; }
private void setLen(int msgLen)
{ length(msgLen + numIntMembers * sizeofIntInBytes); }
public long timeStamp() { return this.msec_; }
public void timeStamp(long msec){ this.msec_ = msec; }
public int pid() { return pid_; }
public void pid(int p) { pid_ = p; }
public byte[] msgData() { return msgData_; }
public void msgData(byte[] m)
{
int size = m.length;
if (size > MAXLOGMSGLEN)
size = MAXLOGMSGLEN;
this.msgData_ = new byte[size];
System.arraycopy(m, 0, msgData_, 0, size);
setLen(size);
}
public void msgData(String m)
{
byte temp[] = m.getBytes();
if (temp.length > MAXLOGMSGLEN) {
this.msgData_ = new byte[MAXLOGMSGLEN];
System.arraycopy(temp, 0, msgData_, 0, MAXLOGMSGLEN);
} else
this.msgData_ = temp;
setLen(msgData_.length);
}
};
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