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Event capture and querying framework for Java
There is a newer version: 0.4.6
/**
 * Copyright (c) 2016, All Contributors (see CONTRIBUTORS file)
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */
package com.eventsourcing.h2;

import com.eventsourcing.Journal;
import com.eventsourcing.Repository;
import com.eventsourcing.h2.index.HashIndex;
import com.eventsourcing.h2.index.UniqueIndex;
import com.eventsourcing.index.Attribute;
import com.eventsourcing.index.CQIndexEngine;
import com.eventsourcing.index.IndexEngine;
import org.h2.mvstore.MVStore;
import org.osgi.service.component.ComponentContext;
import org.osgi.service.component.annotations.Activate;
import org.osgi.service.component.annotations.Component;
import org.osgi.service.component.annotations.Deactivate;

import java.util.Arrays;
import java.util.List;

@Component(property = {"filename=index.db", "type=MVStoreIndexEngine"})
public class MVStoreIndexEngine extends CQIndexEngine implements IndexEngine {

    @Override public String getType() {
        return "MVStoreIndexEngine";
    }

    private MVStore store;

    public MVStoreIndexEngine() {}

    @Override
    public void setRepository(Repository repository) throws IllegalStateException {
        if (isRunning()) {
            throw new IllegalStateException();
        }
        this.repository = repository;
    }

    @Override
    public void setJournal(Journal journal) throws IllegalStateException {
        if (isRunning()) {
            throw new IllegalStateException();
        }
        this.journal = journal;
    }

    public MVStoreIndexEngine(MVStore store) {
        this.store = store;
    }

    @Activate
    protected void activate(ComponentContext ctx) {
        store = MVStore.open((String) ctx.getProperties().get("filename"));
    }

    @Deactivate
    protected void deactivate(ComponentContext ctx) {
        store.close();
    }

    @Override
    protected void doStop() {
        this.store.close();
        super.doStop();
    }

    @Override
    protected List getIndexMatrix() {
        return Arrays.asList(
                new IndexCapabilities("Hash",
                                                 new IndexFeature[]{IndexFeature.EQ, IndexFeature.IN, IndexFeature.QZ},
                                                 attribute -> HashIndex.onAttribute(store, attribute)),
                new IndexCapabilities("Unique",
                                                 new IndexFeature[]{IndexFeature.UNIQUE, IndexFeature.EQ, IndexFeature.IN},
                                                 attribute -> UniqueIndex.onAttribute(store, attribute))
        );
    }

    @Override
    public String toString() {
        return "MVStoreIndexEngine[" + store.getFileStore().getFileName() + "]";
    }
}