com.hazelcast.internal.nearcache.NearCacheRecord Maven / Gradle / Ivy

/*
 * Copyright (c) 2008-2018, Hazelcast, Inc. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.hazelcast.internal.nearcache;

import com.hazelcast.internal.eviction.Evictable;
import com.hazelcast.internal.eviction.Expirable;

import java.util.UUID;

/**
 * An expirable and evictable data object which represents a Near Cache entry.
 * 
 * Record of {@link NearCacheRecordStore}.
 *
 * @param  the type of the value stored by this {@link NearCacheRecord}
 * @see com.hazelcast.internal.eviction.Expirable
 * @see com.hazelcast.internal.eviction.Evictable
 */
public interface NearCacheRecord extends Expirable, Evictable {

    int TIME_NOT_SET = -1;

    long NOT_RESERVED = -1;
    long RESERVED = -2;
    long UPDATE_STARTED = -3;
    long READ_PERMITTED = -4;

    /**
     * Sets the value of this {@link NearCacheRecord}.
     *
     * @param value the value for this {@link NearCacheRecord}
     */
    void setValue(V value);

    /**
     * Sets the creation time of this {@link Evictable} in milliseconds.
     *
     * @param time the creation time for this {@link Evictable} in milliseconds
     */
    void setCreationTime(long time);

    /**
     * Sets the access time of this {@link Evictable} in milliseconds.
     *
     * @param time the latest access time of this {@link Evictable} in milliseconds
     */
    void setAccessTime(long time);

    /**
     * Sets the access hit count of this {@link Evictable}.
     *
     * @param hit the access hit count for this {@link Evictable}
     */
    void setAccessHit(int hit);

    /**
     * Increases the access hit count of this {@link Evictable} by {@code 1}.
     */
    void incrementAccessHit();

    /**
     * Resets the access hit count of this {@link Evictable} to {@code 0}.
     */
    void resetAccessHit();

    /**
     * Checks whether the maximum idle time is passed with respect to the provided time
     * without any access during this time period as {@code maxIdleSeconds}.
     *
     * @param maxIdleMilliSeconds maximum idle time in milliseconds
     * @param now                 current time in milliseconds
     * @return {@code true} if exceeds max idle seconds, otherwise {@code false}
     */
    boolean isIdleAt(long maxIdleMilliSeconds, long now);

    /**
     * @return current state of this record.
     */
    long getRecordState();

    /**
     * @param expect expected value
     * @param update updated value
     * @return {@code true} if successful. False return indicates that
     * the actual value was not equal to the expected value.
     */
    boolean casRecordState(long expect, long update);

    /**
     * @return the partition ID of this record
     */
    int getPartitionId();

    /**
     * @param partitionId the partition ID of this record
     */
    void setPartitionId(int partitionId);

    /**
     * @return last known invalidation sequence at time of this records' creation
     */
    long getInvalidationSequence();

    /**
     * @param sequence last known invalidation sequence at time of this records' creation
     */
    void setInvalidationSequence(long sequence);

    /**
     * @param uuid last known UUID of invalidation source at time of this records' creation
     */
    void setUuid(UUID uuid);

    /**
     * @return {@code true} if supplied UUID equals existing one, otherwise and when one of supplied
     * or existing is null returns {@code false}
     */
    boolean hasSameUuid(UUID uuid);
}