Package com.wavefront.common

Class Utils

java.lang.Object

com.wavefront.common.Utils

public abstract class Utils
extends Object

A placeholder class for miscellaneous utility methods.

Author:

[email protected]

Constructor Summary

Constructors

Constructor	Description
Utils()

Method Summary

Modifier and Type	Method	Description
static String	addHyphensToUuid(String uuid)	Requires an input uuid string Encoded as 32 hex characters.
static String	convertToUuidString(String id)	Method converts a string Id to UUID.
static List<String>	csvToList(String inputString)	Creates an iterator over values a comma-delimited string.
static String	getBuildVersion()	Attempts to retrieve build.version from system build properties.
static String	getJavaVersion()	Returns current java runtime version information (name/vendor/version) as a string.
static String	getLocalHostName()	Makes a best-effort attempt to resolve the hostname for the local host.
static boolean	isWavefrontResponse(javax.ws.rs.core.Response response)	Check if the HTTP 407/408 response was actually received from Wavefront - if it's a JSON object containing "code" key, with value equal to the HTTP response code, it's most likely from us.
static <T> Supplier<T>	lazySupplier(Supplier<T> supplier)	A lazy initialization wrapper for Supplier
static <E extends Throwable> E	throwAny(Throwable t)	Use this to throw checked exceptions from iterator methods that do not declare that they throw checked exceptions.

Methods inherited from class java.lang.Object

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

Constructor Detail

Utils

public Utils()

Method Detail

lazySupplier

public static <T> Supplier<T> lazySupplier(Supplier<T> supplier)

A lazy initialization wrapper for Supplier

Parameters:

supplier - Supplier to lazy-initialize

Returns:

lazy wrapped supplier

addHyphensToUuid

public static String addHyphensToUuid(String uuid)

Requires an input uuid string Encoded as 32 hex characters. For example cced093a76eea418ffdc9bb9a6453df3

Parameters:

uuid - string encoded as 32 hex characters.

Returns:

uuid string encoded in 8-4-4-4-12 (rfc4122) format.

convertToUuidString

@Nullable
public static String convertToUuidString(@Nullable
                                         String id)

Method converts a string Id to UUID. This Method specifically converts id's with less than 32 digit hex characters into UUID format (See RFC 4122: A Universally Unique IDentifier (UUID) URN Namespace) by left padding id with Zeroes and adding hyphens. It assumes that if the input id contains hyphens it is already an UUID. Please don't use this method to validate/guarantee your id as an UUID.

Parameters:

id - a string encoded in hex characters.

Returns:

a UUID string.

csvToList

@Nonnull
public static List<String> csvToList(@Nullable
                                     String inputString)

Creates an iterator over values a comma-delimited string.

Parameters:

inputString - input string

Returns:

iterator

getBuildVersion

public static String getBuildVersion()

Attempts to retrieve build.version from system build properties.

Returns:

build version as string

getJavaVersion

public static String getJavaVersion()

Returns current java runtime version information (name/vendor/version) as a string.

Returns:

java runtime version as string

getLocalHostName

public static String getLocalHostName()

Makes a best-effort attempt to resolve the hostname for the local host.

Returns:

name for localhost

isWavefrontResponse

public static boolean isWavefrontResponse(@Nonnull
                                          javax.ws.rs.core.Response response)

Check if the HTTP 407/408 response was actually received from Wavefront - if it's a JSON object containing "code" key, with value equal to the HTTP response code, it's most likely from us.

Parameters:

response - Response object.

Returns:

whether we consider it a Wavefront response

throwAny

public static <E extends Throwable> E throwAny(Throwable t)
                                        throws E extends Throwable

Use this to throw checked exceptions from iterator methods that do not declare that they throw checked exceptions.

Throws:

E extends Throwable