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Spring Session Integration for App Engine

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package org.hidetake.spring.session.appengine;

import lombok.Getter;
import lombok.Setter;
import lombok.ToString;
import org.springframework.session.ExpiringSession;

import java.io.Serializable;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import java.util.UUID;

@ToString
public class MemcacheSession implements ExpiringSession, Serializable {
    private static final long serialVersionUID = 1L;

    @Getter private final String id = UUID.randomUUID().toString();
    @Getter private final long creationTime = System.currentTimeMillis();
    private final Map attributes = new HashMap<>();

    @Getter @Setter private long lastAccessedTime = creationTime;
    @Getter @Setter private int maxInactiveIntervalInSeconds;

    public MemcacheSession(int maxInactiveIntervalInSeconds) {
        this.maxInactiveIntervalInSeconds = maxInactiveIntervalInSeconds;
    }

    @Override
    public boolean isExpired() {
        return false;
    }

    @Override
    @SuppressWarnings("unchecked")
    public  T getAttribute(String attributeName) {
        return (T) attributes.get(attributeName);
    }

    @Override
    public Set getAttributeNames() {
        return attributes.keySet();
    }

    @Override
    public void setAttribute(String attributeName, Object attributeValue) {
        attributes.put(attributeName, attributeValue);
    }

    @Override
    public void removeAttribute(String attributeName) {
        attributes.remove(attributeName);
    }
}