org.apache.htrace.core

Class TracerId

java.lang.Object

org.apache.htrace.core.TracerId

public final class TracerId
extends Object

The HTrace tracer ID.

HTrace tracer IDs are created from format strings. Format strings contain variables which the TracerId class will replace with the correct values at runtime.

• %{tname}: the tracer name supplied when creating the Tracer.
• %{pname}: the process name obtained from the JVM.
• %{ip}: will be replaced with an ip address.
• %{pid}: the numerical process ID from the operating system.

For example, the string "%{pname}/%{ip}" will be replaced with something like: DataNode/192.168.0.1, assuming that the process' name is DataNode and its IP address is 192.168.0.1.

ID strings can contain backslashes as escapes. For example, "\a" will map to "a". "\%{ip}" will map to the literal string "%{ip}", not the IP address. A backslash itself can be escaped by a preceding backslash.

Field Summary

Fields

Modifier and Type	Field and Description
static String	TRACER_ID_KEY The configuration key to use for process id

Constructor Summary

Constructors

Constructor and Description
TracerId(HTraceConfiguration conf, String tracerName)

Method Summary

Modifier and Type	Method and Description
String	get()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

TRACER_ID_KEY

public static final String TRACER_ID_KEY

The configuration key to use for process id

See Also:

Constant Field Values

Constructor Detail

TracerId

public TracerId(HTraceConfiguration conf,
                String tracerName)

Method Detail

get

public String get()