com.proofpoint.bootcamp.PersonStore.java Source code

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Here is the source code for com.proofpoint.bootcamp.PersonStore.java

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/*
 * Copyright 2010 Proofpoint, Inc.
 *
 * 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.proofpoint.bootcamp;

import com.google.common.base.Preconditions;
import com.google.common.cache.Cache;
import com.google.common.cache.CacheBuilder;
import com.google.common.collect.ImmutableList;
import com.google.inject.Inject;
import com.proofpoint.event.client.EventClient;
import org.weakref.jmx.Flatten;
import org.weakref.jmx.Managed;

import java.util.Collection;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.TimeUnit;

public class PersonStore {
    private final ConcurrentMap<String, Person> persons;
    private final PersonStoreStats stats;

    @Inject
    public PersonStore(StoreConfig config, EventClient eventClient) {
        Preconditions.checkNotNull(config, "config must not be null");
        Preconditions.checkNotNull(eventClient, "eventClient is null");

        Cache<String, Person> personCache = CacheBuilder.newBuilder()
                .expireAfterWrite((long) config.getTtl().toMillis(), TimeUnit.MILLISECONDS).build();
        persons = personCache.asMap();
        stats = new PersonStoreStats(eventClient);
    }

    @Managed
    @Flatten
    public PersonStoreStats getStats() {
        return stats;
    }

    public Person get(String id) {
        Preconditions.checkNotNull(id, "id must not be null");

        Person person = persons.get(id);
        if (person != null) {
            stats.personFetched();
        }
        return person;
    }

    /**
     * @return true if the entry was created for the first time
     */
    public boolean put(String id, Person person) {
        Preconditions.checkNotNull(id, "id must not be null");
        Preconditions.checkNotNull(person, "person must not be null");

        boolean added = persons.put(id, person) == null;
        if (added) {
            stats.personAdded(id, person);
        } else {
            stats.personUpdated(id, person);
        }
        return added;
    }

    /**
     * @return true if the entry was removed
     */
    public boolean delete(String id) {
        Preconditions.checkNotNull(id, "id must not be null");

        Person removedPerson = persons.remove(id);
        if (removedPerson != null) {
            stats.personRemoved(id, removedPerson);
        }

        return removedPerson != null;
    }

    public Collection<Person> getAll() {
        return ImmutableList.copyOf(persons.values());
    }
}