JDK14/Java14源码在线阅读
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*
* This code is distributed in the hope that it will be useful, but WITHOUT
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* 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.
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package sun.tools.jstat;
import java.io.*;
import java.net.*;
import java.util.*;
import java.util.regex.*;
import sun.jvmstat.monitor.Monitor;
import sun.jvmstat.monitor.VmIdentifier;
/**
* Class for processing command line arguments and providing method
* level access to arguments.
*
* @author Brian Doherty
* @since 1.5
*/
public class Arguments {
private static final boolean debug = Boolean.getBoolean("jstat.debug");
private static final boolean showUnsupported =
Boolean.getBoolean("jstat.showUnsupported");
private static final String JVMSTAT_USERDIR = ".jvmstat";
private static final String OPTIONS_FILENAME = "jstat_options";
private static final String UNSUPPORTED_OPTIONS_FILENAME = "jstat_unsupported_options";
private static final String ALL_NAMES = "\\w*";
private Comparator<Monitor> comparator;
private int headerRate;
private boolean help;
private boolean list;
private boolean options;
private boolean constants;
private boolean constantsOnly;
private boolean strings;
private boolean timestamp;
private boolean snap;
private boolean verbose;
private String specialOption;
private String names;
private OptionFormat optionFormat;
private int count = -1;
private int interval = -1;
private String vmIdString;
private VmIdentifier vmId;
public static void printUsage(PrintStream ps) {
ps.println("Usage: jstat --help|-options");
ps.println(" jstat -<option> [-t] [-h<lines>] <vmid> [<interval> [<count>]]");
ps.println();
ps.println("Definitions:");
ps.println(" <option> An option reported by the -options option");
ps.println(" <vmid> Virtual Machine Identifier. A vmid takes the following form:");
ps.println(" <lvmid>[@<hostname>[:<port>]]");
ps.println(" Where <lvmid> is the local vm identifier for the target");
ps.println(" Java virtual machine, typically a process id; <hostname> is");
ps.println(" the name of the host running the target Java virtual machine;");
ps.println(" and <port> is the port number for the rmiregistry on the");
ps.println(" target host. See the jvmstat documentation for a more complete");
ps.println(" description of the Virtual Machine Identifier.");
ps.println(" <lines> Number of samples between header lines.");
ps.println(" <interval> Sampling interval. The following forms are allowed:");
ps.println(" <n>[\"ms\"|\"s\"]");
ps.println(" Where <n> is an integer and the suffix specifies the units as ");
ps.println(" milliseconds(\"ms\") or seconds(\"s\"). The default units are \"ms\".");
ps.println(" <count> Number of samples to take before terminating.");
ps.println(" -J<flag> Pass <flag> directly to the runtime system.");
ps.println(" -? -h --help Prints this help message.");
ps.println(" -help Prints this help message.");
// undocumented options:
// -list [<vmid>] - list counter names
// -snap <vmid> - snapshot counter values as name=value pairs
// -name <pattern> - output counters matching given pattern
// -a - sort in ascending order (default)
// -d - sort in descending order
// -v - verbose output (-snap)
// -constants - output constants with -name output
// -strings - output strings with -name output
// -help - same as -? ...
}
private static int toMillis(String s) throws IllegalArgumentException {
String[] unitStrings = { "ms", "s" }; // ordered from most specific to
// least specific
String unitString = null;
String valueString = s;
for (int i = 0; i < unitStrings.length; i++) {
int index = s.indexOf(unitStrings[i]);
if (index > 0) {
unitString = s.substring(index);
valueString = s.substring(0, index);
break;
}
}
try {
int value = Integer.parseInt(valueString);
if (unitString == null || unitString.compareTo("ms") == 0) {
return value;
} else if (unitString.compareTo("s") == 0) {
return value * 1000;
} else {
throw new IllegalArgumentException(
"Unknow time unit: " + unitString);
}
} catch (NumberFormatException e) {
throw new IllegalArgumentException(
"Could not convert interval: " + s);
}
}
public Arguments(String[] args) throws IllegalArgumentException {
int argc = 0;
if (args.length == 0) {
help = true;
return;
}
if ((args[0].compareTo("-?") == 0)
|| (args[0].compareTo("-h") == 0)
|| (args[0].compareTo("--help") == 0)
// -help: legacy.
|| (args[0].compareTo("-help") == 0)) {
help = true;
return;
} else if (args[0].compareTo("-options") == 0) {
options = true;
return;
} else if (args[0].compareTo("-list") == 0) {
list = true;
if (args.length > 2) {
throw new IllegalArgumentException("invalid argument count");
}
// list can take one arg - a vmid - fall through for arg processing
argc++;
}
for ( ; (argc < args.length) && (args[argc].startsWith("-")); argc++) {
String arg = args[argc];
if (arg.compareTo("-a") == 0) {
comparator = new AscendingMonitorComparator();
} else if (arg.compareTo("-d") == 0) {
comparator = new DescendingMonitorComparator();
} else if (arg.compareTo("-t") == 0) {
timestamp = true;
} else if (arg.compareTo("-v") == 0) {
verbose = true;
} else if ((arg.compareTo("-constants") == 0)
|| (arg.compareTo("-c") == 0)) {
constants = true;
} else if ((arg.compareTo("-strings") == 0)
|| (arg.compareTo("-s") == 0)) {
strings = true;
} else if (arg.startsWith("-h")) {
String value;
if (arg.compareTo("-h") != 0) {
value = arg.substring(2);
} else {
argc++;
if (argc >= args.length) {
throw new IllegalArgumentException(
"-h requires an integer argument");
}
value = args[argc];
}
try {
headerRate = Integer.parseInt(value);
} catch (NumberFormatException e) {
headerRate = -1;
}
if (headerRate < 0) {
throw new IllegalArgumentException(
"illegal -h argument: " + value);
}
} else if (arg.startsWith("-name")) {
if (arg.startsWith("-name=")) {
names = arg.substring(7);
} else {
argc++;
if (argc >= args.length) {
throw new IllegalArgumentException(
"option argument expected");
}
names = args[argc];
}
} else {
/*
* there are scenarios here: special jstat_options file option
* or the rare case of a negative lvmid. The negative lvmid
* can occur in some operating environments (such as Windows
* 95/98/ME), so we provide for this case here by checking if
* the argument has any numerical characters. This assumes that
* there are no special jstat_options that contain numerical
* characters in their name.
*/
// extract the lvmid part of possible lvmid@host.domain:port
String lvmidStr = null;
int at_index = args[argc].indexOf('@');
if (at_index < 0) {
lvmidStr = args[argc];
} else {
lvmidStr = args[argc].substring(0, at_index);
}
// try to parse the lvmid part as an integer
try {
int vmid = Integer.parseInt(lvmidStr);
// it parsed, assume a negative lvmid and continue
break;
} catch (NumberFormatException nfe) {
// it didn't parse. check for the -snap or jstat_options
// file options.
if ((argc == 0) && (args[argc].compareTo("-snap") == 0)) {
snap = true;
} else if (argc == 0) {
specialOption = args[argc].substring(1);
} else {
throw new IllegalArgumentException(
"illegal argument: " + args[argc]);
}
}
}
}
// prevent 'jstat <pid>' from being accepted as a valid argument
if (!(specialOption != null || list || snap || names != null)) {
throw new IllegalArgumentException("-<option> required");
}
switch (args.length - argc) {
case 3:
if (snap) {
throw new IllegalArgumentException("invalid argument count");
}
try {
count = Integer.parseInt(args[args.length-1]);
} catch (NumberFormatException e) {
throw new IllegalArgumentException("illegal count value: "
+ args[args.length-1]);
}
interval = toMillis(args[args.length-2]);
vmIdString = args[args.length-3];
break;
case 2:
if (snap) {
throw new IllegalArgumentException("invalid argument count");
}
interval = toMillis(args[args.length-1]);
vmIdString = args[args.length-2];
break;
case 1:
vmIdString = args[args.length-1];
break;
case 0:
if (!list) {
throw new IllegalArgumentException("invalid argument count");
}
break;
default:
throw new IllegalArgumentException("invalid argument count");
}
// set count and interval to their default values if not set above.
if (count == -1 && interval == -1) {
// default is for a single sample
count = 1;
interval = 0;
}
// validate arguments
if (comparator == null) {
comparator = new AscendingMonitorComparator();
}
// allow ',' characters to separate names, convert to '|' chars
names = (names == null) ? ALL_NAMES : names.replace(',', '|');
// verify that the given pattern parses without errors
try {
Pattern pattern = Pattern.compile(names);
} catch (PatternSyntaxException e) {
throw new IllegalArgumentException("Bad name pattern: "
+ e.getMessage());
}
// verify that the special option is valid and get it's formatter
if (specialOption != null) {
OptionFinder finder = new OptionFinder(optionsSources());
optionFormat = finder.getOptionFormat(specialOption, timestamp);
if (optionFormat == null) {
throw new IllegalArgumentException("Unknown option: -"
+ specialOption);
}
}
// verify that the vm identifier is valied
try {
vmId = new VmIdentifier(vmIdString);
} catch (URISyntaxException e) {
IllegalArgumentException iae = new IllegalArgumentException(
"Malformed VM Identifier: " + vmIdString);
iae.initCause(e);
throw iae;
}
}
public Comparator<Monitor> comparator() {
return comparator;
}
public boolean isHelp() {
return help;
}
public boolean isList() {
return list;
}
public boolean isSnap() {
return snap;
}
public boolean isOptions() {
return options;
}
public boolean isVerbose() {
return verbose;
}
public boolean printConstants() {
return constants;
}
public boolean isConstantsOnly() {
return constantsOnly;
}
public boolean printStrings() {
return strings;
}
public boolean showUnsupported() {
return showUnsupported;
}
public int headerRate() {
return headerRate;
}
public String counterNames() {
return names;
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