44 lines
1.1 KiB
Java
44 lines
1.1 KiB
Java
package btools.server;
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import java.util.HashMap;
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import java.util.Map;
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public class IpAccessMonitor {
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private static Object sync = new Object();
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private static Map<String, Long> ipAccess = new HashMap<>();
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private static long MAX_IDLE = 900000; // 15 minutes
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private static long CLEANUP_INTERVAL = 10000; // 10 seconds
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private static long lastCleanup;
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public static boolean touchIpAccess(String ip) {
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long t = System.currentTimeMillis();
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synchronized (sync) {
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Long lastTime = ipAccess.get(ip);
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ipAccess.put(ip, t);
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return lastTime == null || t - lastTime > MAX_IDLE;
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}
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}
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public static int getSessionCount() {
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long t = System.currentTimeMillis();
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synchronized (sync) {
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if (t - lastCleanup > CLEANUP_INTERVAL) {
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cleanup(t);
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lastCleanup = t;
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}
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return ipAccess.size();
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}
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}
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private static void cleanup(long t) {
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Map<String, Long> newMap = new HashMap<>(ipAccess.size());
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for (Map.Entry<String, Long> e : ipAccess.entrySet()) {
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if (t - e.getValue() <= MAX_IDLE) {
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newMap.put(e.getKey(), e.getValue());
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}
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}
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ipAccess = newMap;
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}
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}
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