com.qwazr.search.index.IndexManager.java Source code

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Here is the source code for com.qwazr.search.index.IndexManager.java

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/**
 * Copyright 2015-2016 Emmanuel Keller / QWAZR
 * <p>
 * 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
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * 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 com.qwazr.search.index;

import com.qwazr.utils.IOUtils;
import com.qwazr.utils.server.ServerException;
import org.apache.commons.io.filefilter.DirectoryFileFilter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.ws.rs.core.Response.Status;
import java.io.File;
import java.io.FileFilter;
import java.io.IOException;
import java.net.URISyntaxException;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ExecutorService;

public class IndexManager {

    public final static String SERVICE_NAME_SEARCH = "search";
    public final static String INDEXES_DIRECTORY = "index";

    private static final Logger logger = LoggerFactory.getLogger(IndexManager.class);

    static IndexManager INSTANCE = null;

    public synchronized static Class<? extends IndexServiceInterface> load(ExecutorService executorService,
            File dataDirectory) throws IOException {
        if (INSTANCE != null)
            throw new IOException("Already loaded");
        File indexesDirectory = new File(dataDirectory, INDEXES_DIRECTORY);
        if (!indexesDirectory.exists())
            indexesDirectory.mkdir();
        if (!indexesDirectory.isDirectory())
            throw new IOException(
                    "This name is not valid. No directory exists for this location: " + indexesDirectory.getName());
        INSTANCE = new IndexManager(executorService, indexesDirectory);
        Runtime.getRuntime().addShutdownHook(new Thread() {
            @Override
            public void run() {
                INSTANCE.shutdown();
            }
        });
        return IndexServiceImpl.class;
    }

    private final ConcurrentHashMap<String, SchemaInstance> schemaMap;

    private final ExecutorService executorService;

    private final File rootDirectory;

    private IndexManager(ExecutorService executorService, File rootDirectory) {
        this.executorService = executorService;
        this.rootDirectory = rootDirectory;
        schemaMap = new ConcurrentHashMap<String, SchemaInstance>();
        File[] directories = rootDirectory.listFiles((FileFilter) DirectoryFileFilter.INSTANCE);
        if (directories == null)
            return;
        for (File schemaDirectory : directories) {
            try {
                schemaMap.put(schemaDirectory.getName(), new SchemaInstance(executorService, schemaDirectory));
            } catch (ServerException | IOException | ReflectiveOperationException | InterruptedException
                    | URISyntaxException e) {
                logger.error(e.getMessage(), e);
            }
        }
    }

    private void shutdown() {
        synchronized (schemaMap) {
            for (SchemaInstance instance : schemaMap.values())
                IOUtils.closeQuietly(instance);
        }
    }

    SchemaSettingsDefinition createUpdate(String schemaName, SchemaSettingsDefinition settings)
            throws ServerException, IOException, InterruptedException, ReflectiveOperationException,
            URISyntaxException {
        synchronized (schemaMap) {
            SchemaInstance schemaInstance = schemaMap.get(schemaName);
            if (schemaInstance == null) {
                schemaInstance = new SchemaInstance(executorService, new File(rootDirectory, schemaName));
                schemaMap.put(schemaName, schemaInstance);
            }
            if (settings != null)
                schemaInstance.setSettings(settings);
            return schemaInstance.getSettings();
        }
    }

    /**
     * Returns the indexSchema. If the schema does not exist, an exception it
     * thrown. This method never returns a null value.
     *
     * @param schemaName The name of the index
     * @return the indexSchema
     * @throws ServerException if any error occurs
     */
    SchemaInstance get(String schemaName) throws ServerException {
        SchemaInstance schemaInstance = schemaMap.get(schemaName);
        if (schemaInstance == null)
            throw new ServerException(Status.NOT_FOUND, "Schema not found: " + schemaName);
        return schemaInstance;
    }

    void delete(String schemaName) throws ServerException {
        synchronized (schemaMap) {
            SchemaInstance schemaInstance = get(schemaName);
            schemaInstance.delete();
            schemaMap.remove(schemaName);
        }
    }

    Set<String> nameSet() {
        return schemaMap.keySet();
    }

    void backups(Integer keepLastCount) throws IOException, InterruptedException {
        synchronized (schemaMap) {
            for (SchemaInstance instance : schemaMap.values())
                instance.backups(keepLastCount);
        }
    }
}