org.smartdeveloperhub.curator.RandomMessageIdentifierFactory.java Source code

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Here is the source code for org.smartdeveloperhub.curator.RandomMessageIdentifierFactory.java

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/**
 * #-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
 *   This file is part of the Smart Developer Hub Project:
 *     http://www.smartdeveloperhub.org/
 *
 *   Center for Open Middleware
 *     http://www.centeropenmiddleware.com/
 * #-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
 *   Copyright (C) 2015-2016 Center for Open Middleware.
 * #-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
 *   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.
 * #-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
 *   Artifact    : org.smartdeveloperhub.curator:sdh-curator-connector:0.2.0
 *   Bundle      : sdh-curator-connector-0.2.0.jar
 * #-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=#
 */
package org.smartdeveloperhub.curator;

import java.util.List;
import java.util.Queue;
import java.util.UUID;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.smartdeveloperhub.curator.connector.MessageIdentifierFactory;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.Lists;

public class RandomMessageIdentifierFactory implements MessageIdentifierFactory {

    private static final Logger LOGGER = LoggerFactory.getLogger(RandomMessageIdentifierFactory.class);

    private final List<UUID> generated;
    private final Queue<UUID> ids;
    private final List<UUID> consumed;

    private int count;

    private RandomMessageIdentifierFactory(List<UUID> ids) {
        this.count = 0;
        this.generated = ImmutableList.copyOf(ids);
        this.consumed = Lists.newArrayList();
        this.ids = Lists.newLinkedList(ids);
    }

    public int size() {
        return this.generated.size();
    }

    public UUID generated(int index) {
        return this.generated.get(index);
    }

    @Override
    public UUID nextIdentifier() {
        final UUID result = this.ids.poll();
        this.consumed.add(result);
        LOGGER.trace("Generated ID {} --> {}", count, result);
        count++;
        return result;
    }

    public static RandomMessageIdentifierFactory create(int idCount) {
        List<UUID> generated = Lists.newArrayList();
        for (int i = 0; i < idCount; i++) {
            generated.add(UUID.randomUUID());
        }
        return new RandomMessageIdentifierFactory(generated);
    }

}