io.silverware.microservices.util

Class Utils

java.lang.Object

io.silverware.microservices.util.Utils

public class Utils
extends Object

Generic utilities.

Author:

Martin Večeřa

Constructor Summary

Constructors

Constructor and Description
Utils()

Method Summary

Modifier and Type	Method and Description
static String	getClassImplVersion(Class clazz) Gets the class implementation version from manifest.
static String	getClassSpecVersion(Class clazz) Gets the class specification version from manifest.
static String	getManifestEntry(Class clazz, String entryName) Gets the manifest entry for the given class.
static String	readFromUrl(String urlString) Completely reads the content of the given URL as a string.
static void	shutdownLog(org.apache.logging.log4j.Logger log, InterruptedException ie) Logs a shutdown message with the given exception.
static void	sleep(long ms) Do the best to sleep for the given time.
static boolean	waitForHttp(String urlString, int code) Waits for the URL to become available.

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

shutdownLog

public static void shutdownLog(org.apache.logging.log4j.Logger log,
                               InterruptedException ie)

Logs a shutdown message with the given exception.

Parameters:

log - A logger where to log the message to.

ie - An exception causing the shutdown.

waitForHttp

public static boolean waitForHttp(String urlString,
                                  int code)
                           throws Exception

Waits for the URL to become available.

Parameters:

urlString - The URL to check for.

code - The expected HTTP response code.

Returns:

Returns true if the URL was available, false otherwise.

Throws:

Exception - When it was not possible to check the URL.

readFromUrl

public static String readFromUrl(String urlString)
                          throws IOException

Completely reads the content of the given URL as a string.

Parameters:

urlString - The URL to read from.

Returns:

The content of the given URL.

Throws:

IOException - When it was not possible to read from the URL.

getManifestEntry

public static String getManifestEntry(Class clazz,
                                      String entryName)
                               throws IOException

Gets the manifest entry for the given class.

Parameters:

clazz - The class I want to obtain entry for.

entryName - The name of the entry to obtain.

Returns:

The entry from manifest, null if there is no such entry or the manifest file does not exists.

Throws:

IOException - When it was not possible to get the manifest file.

getClassImplVersion

public static String getClassImplVersion(Class clazz)

Gets the class implementation version from manifest.

Parameters:

clazz - The class I want to obtain version of.

Returns:

The class specification version from manifest, null if there is no version information present or the manifest file does not exists.

getClassSpecVersion

public static String getClassSpecVersion(Class clazz)

Gets the class specification version from manifest.

Parameters:

clazz - The class I want to obtain version of.

Returns:

The class specification version from manifest, null if there is no version information present or the manifest file does not exists.

sleep

public static void sleep(long ms)

Do the best to sleep for the given time. Ignores InterruptedException.

Parameters:

ms - The number of milliseconds to sleep for.