com.enonic.cms.business.portal.livetrace.HistoryOfPortalRequests.java Source code

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Here is the source code for com.enonic.cms.business.portal.livetrace.HistoryOfPortalRequests.java

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/*
 * Copyright 2000-2011 Enonic AS
 * http://www.enonic.com/license
 */
package com.enonic.cms.business.portal.livetrace;

import java.util.LinkedList;
import java.util.List;
import java.util.concurrent.atomic.AtomicLong;

import com.google.common.collect.ImmutableList;

/**
 * Oct 6, 2010
 */
public class HistoryOfPortalRequests {
    private static AtomicLong histoyCounter = new AtomicLong();

    private int maxSize;

    private LinkedList<PastPortalRequestTrace> list = new LinkedList<PastPortalRequestTrace>();

    public HistoryOfPortalRequests(int maxSize) {
        this.maxSize = maxSize;
    }

    public void add(PortalRequestTrace portalRequestTrace) {
        final long historyCount = histoyCounter.incrementAndGet();

        PastPortalRequestTrace pastPortalRequestTrace = new PastPortalRequestTrace(historyCount,
                portalRequestTrace);

        synchronized (list) {
            list.addFirst(pastPortalRequestTrace);
            doRetainSize();
        }
    }

    public List<PastPortalRequestTrace> getList() {
        synchronized (list) {
            return ImmutableList.copyOf(list);
        }
    }

    public List<PastPortalRequestTrace> getListSince(long historyRecordNumber) {
        LinkedList<PastPortalRequestTrace> sinceList = new LinkedList<PastPortalRequestTrace>();
        for (PastPortalRequestTrace trace : getList()) {
            if (trace.getHistoryRecordNumber() > historyRecordNumber) {
                sinceList.addLast(trace);
            }
        }
        return sinceList;
    }

    private void doRetainSize() {
        if (list.size() > maxSize) {
            list.removeLast();
        }
    }
}