com.liveramp.megadesk.recipes.queue.Queue.java Source code

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Here is the source code for com.liveramp.megadesk.recipes.queue.Queue.java

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/**
 *  Copyright 2014 LiveRamp
 *
 *  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.liveramp.megadesk.recipes.queue;

import com.google.common.collect.ImmutableList;

import com.liveramp.megadesk.core.state.Variable;
import com.liveramp.megadesk.core.transaction.Transaction;

public class Queue<VALUE> extends BaseQueue<VALUE, VALUE> {

    public Queue(Variable<ImmutableList<VALUE>> input, Variable<ImmutableList<VALUE>> output,
            Variable<Boolean> frozen) {
        super(input, output, frozen);
    }

    @Override
    protected VALUE internalRead(ImmutableList<VALUE> transfer) {
        if (transfer.isEmpty()) {
            return null;
        } else {
            return transfer.get(0);
        }
    }

    @Override
    protected Transaction getPopTransaction() {
        return new PopOne<VALUE>(this.getOutput(), this.getFrozen());
    }
}