org.axonframework.ext.chronicle.store.ChronicleEventStore.java Source code

Introduction

Here is the source code for org.axonframework.ext.chronicle.store.ChronicleEventStore.java

Source

/*
 * Copyright (c) 2010-2014. Axon Framework
 *
 * 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 org.axonframework.ext.chronicle.store;

import com.google.common.collect.Maps;
import org.axonframework.domain.DomainEventMessage;
import org.axonframework.domain.DomainEventStream;
import org.axonframework.ext.eventstore.AbstractEventStore;
import org.axonframework.ext.eventstore.CloseableDomainEventStore;
import org.axonframework.ext.eventstore.NullDomainEventStream;
import org.axonframework.serializer.Serializer;
import org.axonframework.serializer.xml.XStreamSerializer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;
import java.util.Map;

/**
 *
 */
public abstract class ChronicleEventStore<T> extends AbstractEventStore {
    private static final Logger LOGGER = LoggerFactory.getLogger(ChronicleEventStore.class);

    private final Serializer m_serializer;
    private final String m_basePath;
    private final Map<String, ChronicleDomainEventStore<T>> m_domainEventStore;

    // *************************************************************************
    //
    // *************************************************************************

    /**
     * c-tor
     *
     * @param basePath the Chronicle base path
     */
    public ChronicleEventStore(String basePath) {
        this(basePath, new XStreamSerializer());
    }

    /**
     * c-tor
     *
     * @param basePath   the Chronicle base path
     * @param serializer the DomainEventStream serializer
     */
    public ChronicleEventStore(String basePath, final Serializer serializer) {
        m_basePath = basePath;
        m_serializer = serializer;
        m_domainEventStore = Maps.newConcurrentMap();

        LOGGER.debug("BasePath for ChronicleEventStore is {}", m_basePath);
    }

    // *************************************************************************
    //
    // *************************************************************************

    @Override
    public void close() throws IOException {
        for (final ChronicleDomainEventStore des : m_domainEventStore.values()) {
            des.close();
        }
    }

    // *************************************************************************
    //
    // *************************************************************************

    @SuppressWarnings("unchecked")
    @Override
    public void appendEvents(String type, DomainEventStream events) {
        int size = 0;

        String storageId = null;
        ChronicleDomainEventStore<T> des = null;

        while (events.hasNext()) {
            DomainEventMessage<T> dem = events.next();
            if (size == 0) {
                storageId = ChronicleEventStoreUtil.getStorageIdentifier(type, dem);
                des = m_domainEventStore.get(storageId);

                if (des == null) {
                    // create a new DomainEventStore
                    des = createDomainEventStore(m_serializer, m_basePath, storageId, type,
                            dem.getAggregateIdentifier().toString());

                    des.init();

                    m_domainEventStore.put(storageId, des);
                }

                if (dem.getSequenceNumber() == 0) {
                    des.clear();
                }
            }

            if (des != null) {
                des.add(dem);
                size++;
            }
        }

        LOGGER.debug("appendEvents: type={}, nbStoredEvents={}, eventStoreSize={}", type, size,
                (des != null) ? des.getStorageSize() : 0);
    }

    @Override
    public DomainEventStream readEvents(String type, Object identifier) {
        final String mapId = ChronicleEventStoreUtil.getStorageIdentifier(type, identifier.toString());
        final CloseableDomainEventStore<T> hdes = m_domainEventStore.get(mapId);

        if (hdes != null) {
            return hdes.getEventStream();
        }

        return NullDomainEventStream.INSTANCE;
    }

    // *************************************************************************
    //
    // *************************************************************************

    /**
     * @param serializer
     * @param basePath
     * @param storageId
     * @param aggregateType
     * @param aggregateId
     * @return
     */
    protected abstract ChronicleDomainEventStore<T> createDomainEventStore(Serializer serializer, String basePath,
            String storageId, String aggregateType, String aggregateId);

}