com.almende.eve.monitor.Cache.java Source code

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Here is the source code for com.almende.eve.monitor.Cache.java

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/*
 * Copyright: Almende B.V. (2014), Rotterdam, The Netherlands
 * License: The Apache Software License, Version 2.0
 */
package com.almende.eve.monitor;

import org.joda.time.DateTime;

import com.fasterxml.jackson.databind.node.ObjectNode;

/**
 * Cache structure for state monitoring.
 * 
 * @author ludo
 */
public class Cache implements ResultMonitorConfigType {
    private static final long serialVersionUID = 2159298023743341010L;
    private DateTime stored = null;
    private Object value = null;

    /**
     * Returns if cached result passes filter data. Default implementation
     * supports filtering on value age:
     * 
     * { "maxAge":1000 } - example: Max age is one second.
     * 
     * @param params
     *            the params
     * @return true, if successful
     */
    public boolean filter(final ObjectNode params) {
        if (!params.has("maxAge") || !params.get("maxAge").isInt() || stored == null) {
            return false;
        }
        return stored.plusMillis(params.get("maxAge").intValue()).isAfterNow();
    }

    /**
     * Store value and set storage time to now();.
     * 
     * @param value
     *            the value
     */
    public void store(final Object value) {
        stored = DateTime.now();
        this.value = value;
    }

    /**
     * Get storage timestamp.
     * 
     * @return the stored
     */
    public DateTime getStored() {
        return stored;
    }

    /**
     * Set storage timestamp for filtering the stored value.
     * 
     * @param stored
     *            the new stored
     */
    public void setStored(final DateTime stored) {
        this.stored = stored;
    }

    /**
     * Basic getter.
     * 
     * @return the value
     */

    public Object getValue() {
        return value;
    }

    /**
     * Basic setter.
     * 
     * @param value
     *            the new value
     */
    public void setValue(final Object value) {
        this.value = value;
    }

}