67 lines
2.5 KiB
Java
67 lines
2.5 KiB
Java
package eu.openaire.urls_controller.util;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import javax.servlet.http.HttpServletRequest;
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import java.text.SimpleDateFormat;
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import java.util.Date;
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public class GenericUtils {
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private static final Logger logger = LoggerFactory.getLogger(GenericUtils.class);
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public static final String endOfLine = "\n";
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private static final SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS z");
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public static String getReadableCurrentTimeAndZone() {
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return (simpleDateFormat.format(new Date(System.currentTimeMillis())));
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}
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public static int getRandomNumber(int min, int max) {
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return (int)(Math.random() * (max - min +1) + min);
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}
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public static String getSelectedStackTraceForCausedException(Throwable thr, String firstMessage, String additionalMessage, int numOfLines)
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{
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// The stacktrace of the "ExecutionException" is the one of the current code and not the code which ran inside the background-task. Try to get the cause.
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Throwable causedThrowable = thr.getCause();
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if ( causedThrowable == null ) {
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logger.warn("No cause was retrieved for the \"ExecutionException\"!");
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causedThrowable = thr;
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}
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String initialMessage = firstMessage + causedThrowable.getMessage() + ((additionalMessage != null) ? additionalMessage : "");
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return getSelectiveStackTrace(causedThrowable, initialMessage, numOfLines);
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}
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public static String getSelectiveStackTrace(Throwable thr, String initialMessage, int numOfLines)
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{
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StackTraceElement[] stels = thr.getStackTrace();
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StringBuilder sb = new StringBuilder(numOfLines *100);
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if ( initialMessage != null )
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sb.append(initialMessage).append(GenericUtils.endOfLine).append("Stacktrace:").append(GenericUtils.endOfLine); // This StringBuilder is thread-safe as a local-variable.
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for ( int i = 0; (i < stels.length) && (i <= numOfLines); ++i ) {
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sb.append(stels[i]);
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if (i < numOfLines) sb.append(GenericUtils.endOfLine);
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}
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return sb.toString();
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}
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public static String getRequestorAddress(HttpServletRequest request)
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{
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String remoteAddr = request.getHeader("X-FORWARDED-FOR"); // This retrieves the original IP address, if the request passes through a proxy server.
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if ( remoteAddr == null )
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remoteAddr = request.getRemoteAddr();
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return remoteAddr;
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}
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}
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