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.HazelcastInstance;
import com.hazelcast.cp.IAtomicLong;
import org.apache.camel.Exchange;
import org.apache.camel.component.hazelcast.HazelcastComponentHelper;
import org.apache.camel.component.hazelcast.HazelcastConstants;
import org.apache.camel.component.hazelcast.HazelcastDefaultEndpoint;
import org.apache.camel.component.hazelcast.HazelcastDefaultProducer;
import org.apache.camel.component.hazelcast.HazelcastOperation;
import org.apache.camel.util.ObjectHelper;

public class HazelcastAtomicnumberProducer extends HazelcastDefaultProducer {

    private final IAtomicLong atomicnumber;

    public HazelcastAtomicnumberProducer(HazelcastInstance hazelcastInstance, HazelcastDefaultEndpoint endpoint,
                                         String cacheName) {
        super(endpoint);
        this.atomicnumber = hazelcastInstance.getCPSubsystem().getAtomicLong(cacheName);
    }

    @Override
    public void process(Exchange exchange) throws Exception {

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

        long expectedValue = 0L;

        if (headers.containsKey(HazelcastConstants.EXPECTED_VALUE)) {
            expectedValue = (long) headers.get(HazelcastConstants.EXPECTED_VALUE);
        }

        HazelcastOperation operation = lookupOperation(exchange);

        switch (operation) {

            case INCREMENT:
                this.increment(exchange);
                break;

            case DECREMENT:
                this.decrement(exchange);
                break;

            case COMPARE_AND_SET:
                this.compare(expectedValue, exchange);
                break;

            case GET_AND_ADD:
                this.getAndAdd(exchange);
                break;

            case SET_VALUE:
                this.set(exchange);
                break;

            case GET:
                this.get(exchange);
                break;

            case DESTROY:
                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.getMessage().setBody(this.atomicnumber.get());
    }

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

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

    private void compare(long expected, Exchange exchange) {
        long update = exchange.getIn().getBody(Long.class);
        if (ObjectHelper.isEmpty(expected)) {
            throw new IllegalArgumentException("Expected value must be specified");
        }
        exchange.getMessage().setBody(this.atomicnumber.compareAndSet(expected, update));
    }

    private void getAndAdd(Exchange exchange) {
        long delta = exchange.getIn().getBody(Long.class);
        exchange.getMessage().setBody(this.atomicnumber.getAndAdd(delta));
    }

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

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

}