org.apache.camel.component.hazelcast.atomicnumber.HazelcastAtomicnumberProducer Maven / Gradle / Ivy

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Camel HazelCast based work queue implementation
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/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.camel.component.hazelcast.atomicnumber;

import java.util.Map;

import com.hazelcast.core.AtomicNumber;
import com.hazelcast.core.Hazelcast;

import org.apache.camel.Endpoint;
import org.apache.camel.Exchange;
import org.apache.camel.component.hazelcast.HazelcastComponentHelper;
import org.apache.camel.component.hazelcast.HazelcastConstants;
import org.apache.camel.impl.DefaultProducer;

public class HazelcastAtomicnumberProducer extends DefaultProducer {

    private final AtomicNumber atomicnumber;
    private final HazelcastComponentHelper helper = new HazelcastComponentHelper();

    public HazelcastAtomicnumberProducer(Endpoint endpoint, String cacheName) {
        super(endpoint);
        this.atomicnumber = Hazelcast.getAtomicNumber(cacheName);
    }

    public void process(Exchange exchange) throws Exception {

        Map headers = exchange.getIn().getHeaders();

        // get header parameters
        int operation = -1;

        if (headers.containsKey(HazelcastConstants.OPERATION)) {
            if (headers.get(HazelcastConstants.OPERATION) instanceof String) {
                operation = this.helper.lookupOperationNumber((String) headers.get(HazelcastConstants.OPERATION));
            } else {
                operation = (Integer) headers.get(HazelcastConstants.OPERATION);
            }
        }

        switch (operation) {

        case HazelcastConstants.INCREMENT_OPERATION:
            this.increment(exchange);
            break;

        case HazelcastConstants.DECREMENT_OPERATION:
            this.decrement(exchange);
            break;

        case HazelcastConstants.SETVALUE_OPERATION:
            this.set(exchange);
            break;

        case HazelcastConstants.GET_OPERATION:
            this.get(exchange);
            break;

        case HazelcastConstants.DESTROY_OPERATION:
            this.destroy();
            break;

        default:
            throw new IllegalArgumentException(String.format("The value '%s' is not allowed for parameter '%s' on the ATOMICNUMBER.", operation, HazelcastConstants.OPERATION));
        }

        // finally copy headers
        HazelcastComponentHelper.copyHeaders(exchange);
    }

    private void get(Exchange exchange) {
        exchange.getOut().setBody(this.atomicnumber.get());
    }

    private void increment(Exchange exchange) {
        exchange.getOut().setBody(this.atomicnumber.incrementAndGet());
    }

    private void decrement(Exchange exchange) {
        exchange.getOut().setBody(this.atomicnumber.decrementAndGet());
    }

    private void set(Exchange exchange) {
        this.atomicnumber.set(exchange.getIn().getBody(Long.class));
    }

    private void destroy() {
        this.atomicnumber.destroy();
    }

}