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ActiveMQ example source code file (ConsumerInfo.java)

This example ActiveMQ source code file (ConsumerInfo.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - ActiveMQ tags/keywords

activemqdestination, arraylist, arraylist, booleanexpression, brokerid, consumerid, consumerid, consumerinfo, consumerinfo, data_structure_type, list, removeinfo, string, string, util

The ActiveMQ ConsumerInfo.java source code

/**
 * 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.activemq.command;

import java.util.ArrayList;
import java.util.List;

import org.apache.activemq.filter.BooleanExpression;
import org.apache.activemq.state.CommandVisitor;

/**
 * @openwire:marshaller code="5"
 * 
 */
public class ConsumerInfo extends BaseCommand {

    public static final byte DATA_STRUCTURE_TYPE = CommandTypes.CONSUMER_INFO;

    public static final byte HIGH_PRIORITY = 10;
    public static final byte NORMAL_PRIORITY = 0;
    public static final byte NETWORK_CONSUMER_PRIORITY = -5;
    public static final byte LOW_PRIORITY = -10;

    protected ConsumerId consumerId;
    protected ActiveMQDestination destination;
    protected int prefetchSize;
    protected int maximumPendingMessageLimit;
    protected boolean browser;
    protected boolean dispatchAsync;
    protected String selector;
    protected String subscriptionName;
    protected boolean noLocal;
    protected boolean exclusive;
    protected boolean retroactive;
    protected byte priority;
    protected BrokerId[] brokerPath;
    protected boolean optimizedAcknowledge;
    // used by the broker
    protected transient int currentPrefetchSize;
    // if true, the consumer will not send range
    protected boolean noRangeAcks;
    // acks.

    protected BooleanExpression additionalPredicate;
    protected transient boolean networkSubscription; // this subscription
    protected transient List<ConsumerId> networkConsumerIds; // the original consumerId

    // not marshalled, populated from RemoveInfo, the last message delivered, used
    // to suppress redelivery on prefetched messages after close
    private transient long lastDeliveredSequenceId;

    // originated from a
    // network connection

    public ConsumerInfo() {
    }

    public ConsumerInfo(ConsumerId consumerId) {
        this.consumerId = consumerId;
    }

    public ConsumerInfo(SessionInfo sessionInfo, long consumerId) {
        this.consumerId = new ConsumerId(sessionInfo.getSessionId(), consumerId);
    }

    public ConsumerInfo copy() {
        ConsumerInfo info = new ConsumerInfo();
        copy(info);
        return info;
    }

    public void copy(ConsumerInfo info) {
        super.copy(info);
        info.consumerId = consumerId;
        info.destination = destination;
        info.prefetchSize = prefetchSize;
        info.maximumPendingMessageLimit = maximumPendingMessageLimit;
        info.browser = browser;
        info.dispatchAsync = dispatchAsync;
        info.selector = selector;
        info.subscriptionName = subscriptionName;
        info.noLocal = noLocal;
        info.exclusive = exclusive;
        info.retroactive = retroactive;
        info.priority = priority;
        info.brokerPath = brokerPath;
        info.networkSubscription = networkSubscription;
        if (networkConsumerIds != null) {
            if (info.networkConsumerIds==null){
                info.networkConsumerIds=new ArrayList<ConsumerId>();
            }
            info.networkConsumerIds.addAll(networkConsumerIds);
        }
    }

    public boolean isDurable() {
        return subscriptionName != null;
    }

    public byte getDataStructureType() {
        return DATA_STRUCTURE_TYPE;
    }

    /**
     * Is used to uniquely identify the consumer to the broker.
     * 
     * @openwire:property version=1 cache=true
     */
    public ConsumerId getConsumerId() {
        return consumerId;
    }

    public void setConsumerId(ConsumerId consumerId) {
        this.consumerId = consumerId;
    }

    /**
     * Is this consumer a queue browser?
     * 
     * @openwire:property version=1
     */
    public boolean isBrowser() {
        return browser;
    }

    public void setBrowser(boolean browser) {
        this.browser = browser;
    }

    /**
     * The destination that the consumer is interested in receiving messages
     * from. This destination could be a composite destination.
     * 
     * @openwire:property version=1 cache=true
     */
    public ActiveMQDestination getDestination() {
        return destination;
    }

    public void setDestination(ActiveMQDestination destination) {
        this.destination = destination;
    }

    /**
     * How many messages a broker will send to the client without receiving an
     * ack before he stops dispatching messages to the client.
     * 
     * @openwire:property version=1
     */
    public int getPrefetchSize() {
        return prefetchSize;
    }

    public void setPrefetchSize(int prefetchSize) {
        this.prefetchSize = prefetchSize;
        this.currentPrefetchSize = prefetchSize;
    }

    /**
     * How many messages a broker will keep around, above the prefetch limit,
     * for non-durable topics before starting to discard older messages.
     * 
     * @openwire:property version=1
     */
    public int getMaximumPendingMessageLimit() {
        return maximumPendingMessageLimit;
    }

    public void setMaximumPendingMessageLimit(int maximumPendingMessageLimit) {
        this.maximumPendingMessageLimit = maximumPendingMessageLimit;
    }

    /**
     * Should the broker dispatch a message to the consumer async? If he does it
     * async, then he uses a more SEDA style of processing while if it is not
     * done async, then he broker use a STP style of processing. STP is more
     * appropriate in high bandwidth situations or when being used by and in vm
     * transport.
     * 
     * @openwire:property version=1
     */
    public boolean isDispatchAsync() {
        return dispatchAsync;
    }

    public void setDispatchAsync(boolean dispatchAsync) {
        this.dispatchAsync = dispatchAsync;
    }

    /**
     * The JMS selector used to filter out messages that this consumer is
     * interested in.
     * 
     * @openwire:property version=1
     */
    public String getSelector() {
        return selector;
    }

    public void setSelector(String selector) {
        this.selector = selector;
    }

    /**
     * Used to identify the name of a durable subscription.
     * 
     * @openwire:property version=1
     */
    public String getSubscriptionName() {
        return subscriptionName;
    }

    public void setSubscriptionName(String durableSubscriptionId) {
        this.subscriptionName = durableSubscriptionId;
    }

    /**
     * @deprecated
     * @return
     * @see getSubscriptionName
     */
    public String getSubcriptionName() {
        return subscriptionName;
    }

    /**
     * @deprecated
     * @see setSubscriptionName
     * @param durableSubscriptionId
     */
    public void setSubcriptionName(String durableSubscriptionId) {
        this.subscriptionName = durableSubscriptionId;
    }

    /**
     * Set noLocal to true to avoid receiving messages that were published
     * locally on the same connection.
     * 
     * @openwire:property version=1
     */
    public boolean isNoLocal() {
        return noLocal;
    }

    public void setNoLocal(boolean noLocal) {
        this.noLocal = noLocal;
    }

    /**
     * An exclusive consumer locks out other consumers from being able to
     * receive messages from the destination. If there are multiple exclusive
     * consumers for a destination, the first one created will be the exclusive
     * consumer of the destination.
     * 
     * @openwire:property version=1
     */
    public boolean isExclusive() {
        return exclusive;
    }

    public void setExclusive(boolean exclusive) {
        this.exclusive = exclusive;
    }

    /**
     * A retroactive consumer only has meaning for Topics. It allows a consumer
     * to retroactively see messages sent prior to the consumer being created.
     * If the consumer is not durable, it will be delivered the last message
     * published to the topic. If the consumer is durable then it will receive
     * all persistent messages that are still stored in persistent storage for
     * that topic.
     * 
     * @openwire:property version=1
     */
    public boolean isRetroactive() {
        return retroactive;
    }

    public void setRetroactive(boolean retroactive) {
        this.retroactive = retroactive;
    }

    public RemoveInfo createRemoveCommand() {
        RemoveInfo command = new RemoveInfo(getConsumerId());
        command.setResponseRequired(isResponseRequired());
        return command;
    }

    /**
     * The broker will avoid dispatching to a lower priority consumer if there
     * are other higher priority consumers available to dispatch to. This allows
     * letting the broker to have an affinity to higher priority consumers.
     * Default priority is 0.
     * 
     * @openwire:property version=1
     */
    public byte getPriority() {
        return priority;
    }

    public void setPriority(byte priority) {
        this.priority = priority;
    }

    /**
     * The route of brokers the command has moved through.
     * 
     * @openwire:property version=1 cache=true
     */
    public BrokerId[] getBrokerPath() {
        return brokerPath;
    }

    public void setBrokerPath(BrokerId[] brokerPath) {
        this.brokerPath = brokerPath;
    }

    /**
     * A transient additional predicate that can be used it inject additional
     * predicates into the selector on the fly. Handy if if say a Security
     * Broker interceptor wants to filter out messages based on security level
     * of the consumer.
     * 
     * @openwire:property version=1
     */
    public BooleanExpression getAdditionalPredicate() {
        return additionalPredicate;
    }

    public void setAdditionalPredicate(BooleanExpression additionalPredicate) {
        this.additionalPredicate = additionalPredicate;
    }

    public Response visit(CommandVisitor visitor) throws Exception {
        return visitor.processAddConsumer(this);
    }

    /**
     * @openwire:property version=1
     * @return Returns the networkSubscription.
     */
    public boolean isNetworkSubscription() {
        return networkSubscription;
    }

    /**
     * @param networkSubscription The networkSubscription to set.
     */
    public void setNetworkSubscription(boolean networkSubscription) {
        this.networkSubscription = networkSubscription;
    }

    /**
     * @openwire:property version=1
     * @return Returns the optimizedAcknowledge.
     */
    public boolean isOptimizedAcknowledge() {
        return optimizedAcknowledge;
    }

    /**
     * @param optimizedAcknowledge The optimizedAcknowledge to set.
     */
    public void setOptimizedAcknowledge(boolean optimizedAcknowledge) {
        this.optimizedAcknowledge = optimizedAcknowledge;
    }

    /**
     * @return Returns the currentPrefetchSize.
     */
    public int getCurrentPrefetchSize() {
        return currentPrefetchSize;
    }

    /**
     * @param currentPrefetchSize The currentPrefetchSize to set.
     */
    public void setCurrentPrefetchSize(int currentPrefetchSize) {
        this.currentPrefetchSize = currentPrefetchSize;
    }

    /**
     * The broker may be able to optimize it's processing or provides better QOS
     * if it knows the consumer will not be sending ranged acks.
     * 
     * @return true if the consumer will not send range acks.
     * @openwire:property version=1
     */
    public boolean isNoRangeAcks() {
        return noRangeAcks;
    }

    public void setNoRangeAcks(boolean noRangeAcks) {
        this.noRangeAcks = noRangeAcks;
    }

    public synchronized void addNetworkConsumerId(ConsumerId networkConsumerId) {
        if (networkConsumerIds == null) {
            networkConsumerIds = new ArrayList<ConsumerId>();
        }
        networkConsumerIds.add(networkConsumerId);
    }

    public synchronized void removeNetworkConsumerId(ConsumerId networkConsumerId) {
        if (networkConsumerIds != null) {
            networkConsumerIds.remove(networkConsumerId);
            if (networkConsumerIds.isEmpty()) {
                networkConsumerIds=null;
            }
        }
    }
    
    public synchronized boolean isNetworkConsumersEmpty() {
        return networkConsumerIds == null || networkConsumerIds.isEmpty();
    }
    
    public synchronized List<ConsumerId> getNetworkConsumerIds(){
        List<ConsumerId> result = new ArrayList();
        if (networkConsumerIds != null) {
            result.addAll(networkConsumerIds);
        }
        return result;
    }

    /**
     * Tracks the original subscription id that causes a subscription to 
     * percolate through a network when networkTTL > 1. Tracking the original
     * subscription allows duplicate suppression.
     * 
     * @return array of the current subscription path
     * @openwire:property version=4
     */
    public ConsumerId[] getNetworkConsumerPath() {
        ConsumerId[] result = null;
        if (networkConsumerIds != null) {
            result = networkConsumerIds.toArray(new ConsumerId[0]);
        }
        return result;
    }
    
    public void setNetworkConsumerPath(ConsumerId[] consumerPath) {
        if (consumerPath != null) {
            for (int i=0; i<consumerPath.length; i++) {
                addNetworkConsumerId(consumerPath[i]);
            }
        }
    }

    public void setLastDeliveredSequenceId(long lastDeliveredSequenceId) {
        this.lastDeliveredSequenceId  = lastDeliveredSequenceId;
    }
    
    public long getLastDeliveredSequenceId() {
        return lastDeliveredSequenceId;
    }

}

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