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ActiveMQ example source code file (AMQTransactionStore.java)

This example ActiveMQ source code file (AMQTransactionStore.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

amqpersistenceadapter, amqtransactionstore, amqtx, amqtx, exception, io, ioexception, ioexception, iterator, linkedhashmap, location, location, map, map, messageack, util

The ActiveMQ AMQTransactionStore.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.store.amq;

import java.io.IOException;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.Map;
import javax.transaction.xa.XAException;
import org.apache.activemq.command.JournalTopicAck;
import org.apache.activemq.command.JournalTransaction;
import org.apache.activemq.command.Message;
import org.apache.activemq.command.MessageAck;
import org.apache.activemq.command.TransactionId;
import org.apache.activemq.command.XATransactionId;
import org.apache.activemq.kaha.impl.async.Location;
import org.apache.activemq.store.TransactionRecoveryListener;
import org.apache.activemq.store.TransactionStore;

/**
 */
public class AMQTransactionStore implements TransactionStore {

    protected Map<TransactionId, AMQTx> inflightTransactions = new LinkedHashMap();
    Map<TransactionId, AMQTx> preparedTransactions = new LinkedHashMap();

    private final AMQPersistenceAdapter peristenceAdapter;
    private boolean doingRecover;

    public AMQTransactionStore(AMQPersistenceAdapter adapter) {
        this.peristenceAdapter = adapter;
    }

    /**
     * @throws IOException
     * @see org.apache.activemq.store.TransactionStore#prepare(TransactionId)
     */
    public void prepare(TransactionId txid) throws IOException {
        AMQTx tx = null;
        synchronized (inflightTransactions) {
            tx = inflightTransactions.remove(txid);
        }
        if (tx == null) {
            return;
        }
        peristenceAdapter.writeCommand(new JournalTransaction(JournalTransaction.XA_PREPARE, txid, false), true);
        synchronized (preparedTransactions) {
            preparedTransactions.put(txid, tx);
        }
    }

    /**
     * @throws IOException
     * @see org.apache.activemq.store.TransactionStore#prepare(TransactionId)
     */
    public void replayPrepare(TransactionId txid) throws IOException {
        AMQTx tx = null;
        synchronized (inflightTransactions) {
            tx = inflightTransactions.remove(txid);
        }
        if (tx == null) {
            return;
        }
        synchronized (preparedTransactions) {
            preparedTransactions.put(txid, tx);
        }
    }

    public AMQTx getTx(TransactionId txid, Location location) {
        AMQTx tx = null;
        synchronized (inflightTransactions) {
            tx = inflightTransactions.get(txid);
            if (tx == null) {
                tx = new AMQTx(location);
                inflightTransactions.put(txid, tx);
            }
        }
        return tx;
    }

    /**
     * @throws XAException
     * @see org.apache.activemq.store.TransactionStore#commit(org.apache.activemq.service.Transaction)
     */
    public void commit(TransactionId txid, boolean wasPrepared, Runnable preCommit,Runnable postCommit) throws IOException {
        if (preCommit != null) {
            preCommit.run();
        }
        AMQTx tx;
        if (wasPrepared) {
            synchronized (preparedTransactions) {
                tx = preparedTransactions.remove(txid);
            }
        } else {
            synchronized (inflightTransactions) {
                tx = inflightTransactions.remove(txid);
            }
        }
        if (tx == null) {
            if (postCommit != null) {
                postCommit.run();
            }
            return;
        }
        if (txid.isXATransaction()) {
            peristenceAdapter.writeCommand(new JournalTransaction(JournalTransaction.XA_COMMIT, txid, wasPrepared), true,true);
        } else {
            peristenceAdapter.writeCommand(new JournalTransaction(JournalTransaction.LOCAL_COMMIT, txid, wasPrepared), true,true);
        }
        if (postCommit != null) {
            postCommit.run();
        }
    }

    /**
     * @throws XAException
     * @see org.apache.activemq.store.TransactionStore#commit(org.apache.activemq.service.Transaction)
     */
    public AMQTx replayCommit(TransactionId txid, boolean wasPrepared) throws IOException {
        if (wasPrepared) {
            synchronized (preparedTransactions) {
                return preparedTransactions.remove(txid);
            }
        } else {
            synchronized (inflightTransactions) {
                return inflightTransactions.remove(txid);
            }
        }
    }

    /**
     * @throws IOException
     * @see org.apache.activemq.store.TransactionStore#rollback(TransactionId)
     */
    public void rollback(TransactionId txid) throws IOException {
        AMQTx tx = null;
        synchronized (inflightTransactions) {
            tx = inflightTransactions.remove(txid);
        }
        if (tx != null) {
            synchronized (preparedTransactions) {
                tx = preparedTransactions.remove(txid);
            }
        }
        if (tx != null) {
            if (txid.isXATransaction()) {
                peristenceAdapter.writeCommand(new JournalTransaction(JournalTransaction.XA_ROLLBACK, txid, false), true,true);
            } else {
                peristenceAdapter.writeCommand(new JournalTransaction(JournalTransaction.LOCAL_ROLLBACK, txid, false), true,true);
            }
        }
    }

    /**
     * @throws IOException
     * @see org.apache.activemq.store.TransactionStore#rollback(TransactionId)
     */
    public void replayRollback(TransactionId txid) throws IOException {
        boolean inflight = false;
        synchronized (inflightTransactions) {
            inflight = inflightTransactions.remove(txid) != null;
        }
        if (inflight) {
            synchronized (preparedTransactions) {
                preparedTransactions.remove(txid);
            }
        }
    }

    public void start() throws Exception {
    }

    public void stop() throws Exception {
    }

    public synchronized void recover(TransactionRecoveryListener listener) throws IOException {
        // All the in-flight transactions get rolled back..
        synchronized (inflightTransactions) {
            inflightTransactions.clear();
        }
        this.doingRecover = true;
        try {
            Map<TransactionId, AMQTx> txs = null;
            synchronized (preparedTransactions) {
                txs = new LinkedHashMap<TransactionId, AMQTx>(preparedTransactions);
            }
            for (Iterator<TransactionId> iter = txs.keySet().iterator(); iter.hasNext();) {
                Object txid = iter.next();
                AMQTx tx = txs.get(txid);
                listener.recover((XATransactionId)txid, tx.getMessages(), tx.getAcks());
            }
        } finally {
            this.doingRecover = false;
        }
    }

    /**
     * @param message
     * @throws IOException
     */
    void addMessage(AMQMessageStore store, Message message, Location location) throws IOException {
        AMQTx tx = getTx(message.getTransactionId(), location);
        tx.add(store, message, location);
    }

    /**
     * @param ack
     * @throws IOException
     */
    public void removeMessage(AMQMessageStore store, MessageAck ack, Location location) throws IOException {
        AMQTx tx = getTx(ack.getTransactionId(), location);
        tx.add(store, ack);
    }

    public void acknowledge(AMQTopicMessageStore store, JournalTopicAck ack, Location location) {
        AMQTx tx = getTx(ack.getTransactionId(), location);
        tx.add(store, ack);
    }

    public Location checkpoint() throws IOException {
        // Nothing really to checkpoint.. since, we don't
        // checkpoint tx operations in to long term store until they are
        // committed.
        // But we keep track of the first location of an operation
        // that was associated with an active tx. The journal can not
        // roll over active tx records.
        Location minimumLocationInUse = null;
        synchronized (inflightTransactions) {
            for (Iterator<AMQTx> iter = inflightTransactions.values().iterator(); iter.hasNext();) {
                AMQTx tx = iter.next();
                Location location = tx.getLocation();
                if (minimumLocationInUse == null || location.compareTo(minimumLocationInUse) < 0) {
                    minimumLocationInUse = location;
                }
            }
        }
        synchronized (preparedTransactions) {
            for (Iterator<AMQTx> iter = preparedTransactions.values().iterator(); iter.hasNext();) {
                AMQTx tx = iter.next();
                Location location = tx.getLocation();
                if (minimumLocationInUse == null || location.compareTo(minimumLocationInUse) < 0) {
                    minimumLocationInUse = location;
                }
            }
            return minimumLocationInUse;
        }
    }

    public boolean isDoingRecover() {
        return doingRecover;
    }

    /**
     * @return the preparedTransactions
     */
    public Map<TransactionId, AMQTx> getPreparedTransactions() {
        return this.preparedTransactions;
    }

    /**
     * @param preparedTransactions the preparedTransactions to set
     */
    public void setPreparedTransactions(Map<TransactionId, AMQTx> preparedTransactions) {
        if (preparedTransactions != null) {
            this.preparedTransactions.clear();
            this.preparedTransactions.putAll(preparedTransactions);
        }
    }
}

Other ActiveMQ examples (source code examples)

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