no.digipost.cache.inmemory.CacheConfig.java Source code

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Here is the source code for no.digipost.cache.inmemory.CacheConfig.java

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/**
 * Copyright (C) Posten Norge AS
 *
 * 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 no.digipost.cache.inmemory;

import com.google.common.base.Ticker;
import com.google.common.cache.CacheBuilder;
import com.google.common.cache.RemovalListener;
import com.google.common.cache.RemovalNotification;
import org.joda.time.DateTime;
import org.joda.time.Duration;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.concurrent.TimeUnit;

public abstract class CacheConfig implements ConfiguresGuavaCache {

    private static final Logger LOG = LoggerFactory.getLogger(CacheConfig.class);

    public static final CacheConfig useSoftValues = new CacheConfig() {
        @Override
        public CacheBuilder<Object, Object> configure(CacheBuilder<Object, Object> builder) {
            LOG.info(
                    "Using soft references for caching. See http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/ref/SoftReference.html");
            return builder.softValues();
        }
    };

    public static CacheConfig expireAfterAccess(final Duration expiryTime) {
        return new CacheConfig() {
            @Override
            public CacheBuilder<Object, Object> configure(CacheBuilder<Object, Object> builder) {
                LOG.info("Expires values {} ms after last access", expiryTime.getMillis());
                return builder.expireAfterAccess(expiryTime.getMillis(), TimeUnit.MILLISECONDS);
            }
        };
    }

    public static CacheConfig expireAfterWrite(final Duration expiryTime) {
        return new CacheConfig() {
            @Override
            public CacheBuilder<Object, Object> configure(CacheBuilder<Object, Object> builder) {
                LOG.info("Expire values {} ms after they are written to the cache", expiryTime.getMillis());
                return builder.expireAfterWrite(expiryTime.getMillis(), TimeUnit.MILLISECONDS);
            }
        };
    }

    public static CacheConfig initialCapacity(final int initCapacity) {
        return new CacheConfig() {
            @Override
            public CacheBuilder<Object, Object> configure(CacheBuilder<Object, Object> builder) {
                LOG.info("Initial capacity = {}", initCapacity);
                return builder.initialCapacity(initCapacity);
            }
        };
    }

    public static CacheConfig maximumSize(final long size) {
        return new CacheConfig() {
            @Override
            public CacheBuilder<Object, Object> configure(CacheBuilder<Object, Object> builder) {
                LOG.info("Maximum size = {}", size);
                return builder.maximumSize(size);
            }
        };
    }

    public static CacheConfig recordStats() {
        return new CacheConfig() {
            @Override
            public CacheBuilder<Object, Object> configure(CacheBuilder<Object, Object> builder) {
                LOG.info("Recording stats");
                return builder.recordStats();
            }
        };
    }

    static final CacheConfig jodaTicker = new CacheConfig() {
        @Override
        public CacheBuilder<Object, Object> configure(CacheBuilder<Object, Object> builder) {
            LOG.info("Using JodaTime as the clock source");
            return builder.ticker(new Ticker() {
                @Override
                public long read() {
                    return DateTime.now().getMillis() * 1000000;
                }
            });
        }
    };

    static final CacheConfig logRemoval = new CacheConfig() {
        @Override
        public CacheBuilder<Object, Object> configure(CacheBuilder<Object, Object> builder) {
            return builder.removalListener(new RemovalListener<Object, Object>() {
                @Override
                public void onRemoval(RemovalNotification<Object, Object> notification) {
                    Cache.LOG.info("Removing '{}' from cache (key={}). Cause: {}.", notification.getValue(),
                            notification.getKey(), notification.getCause());
                }
            });
        }
    };

    protected CacheConfig() {
    }
}