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package eu.dnetlib.functionality.modular.ui.utils;
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import java.text.SimpleDateFormat;
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import java.util.Date;
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import java.util.List;
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import java.util.concurrent.LinkedBlockingQueue;
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import org.apache.log4j.AppenderSkeleton;
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import org.apache.log4j.spi.LoggingEvent;
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import com.google.common.base.Joiner;
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import com.google.common.base.Predicate;
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import com.google.common.collect.Iterables;
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import com.google.common.collect.Lists;
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import com.google.common.collect.Queues;
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public class LogUiAppender extends AppenderSkeleton {
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public static final int MAX_LOGS_IN_QUEUE = 2000;
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private final LinkedBlockingQueue<LogLine> logQueue = Queues.newLinkedBlockingQueue(MAX_LOGS_IN_QUEUE);
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private int count = 0;
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private static final SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
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@Override
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protected void append(final LoggingEvent event) {
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synchronized (logQueue) {
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if (logQueue.remainingCapacity() == 0) {
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logQueue.poll();
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}
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try {
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final String date = dateFormat.format(new Date(event.getTimeStamp()));
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final String[] arr = event.getThrowableStrRep();
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final String strace = arr != null && arr.length > 0 ? Joiner.on("\n").join(arr) : "";
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logQueue.put(new LogLine(count++, event.getLevel().toString(), event.getLoggerName(), date, event.getRenderedMessage(), strace));
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} catch (InterruptedException e) {
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throw new RuntimeException(e);
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}
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}
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}
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public List<LogLine> tail_N(final int n) throws Exception {
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synchronized (logQueue) {
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int qSize = logQueue.size();
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if (n <= 0 || qSize == 0) {
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return Lists.newArrayList();
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} else if (n < qSize) {
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return Lists.newArrayList(logQueue).subList(qSize - n, qSize);
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} else {
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return Lists.newArrayList(logQueue);
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}
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}
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}
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public List<LogLine> tail_continue(final int after) throws Exception {
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synchronized (logQueue) {
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return Lists.newArrayList(Iterables.filter(logQueue, new Predicate<LogLine>() {
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@Override
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public boolean apply(final LogLine ll) {
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return ll.getId() > after;
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}
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}));
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}
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}
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@Override
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public void close() {}
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@Override
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public boolean requiresLayout() {
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return false;
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}
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}
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