AbstractESComponent.java

/*
 * Copyright 2015 JBoss Inc
 *
 * 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 io.apiman.gateway.engine.es;

import io.searchbox.client.JestClient;

import java.util.Map;

/**
 * Base class for the elasticsearch component impls.
 *
 * @author eric.wittmann@redhat.com
 */
public abstract class AbstractESComponent {

    private final Map<String, String> config;
    private JestClient esClient;
    private String indexName;

    /**
     * Constructor.
     * @param config the config
     */
    public AbstractESComponent(Map<String, String> config) {
        this.config = config;
        String indexName = config.get("client.index"); //$NON-NLS-1$
        if (indexName == null) {
            indexName = getDefaultIndexName();
        }
        this.indexName = indexName;
    }

    /**
     * @return the esClient
     */
    public synchronized JestClient getClient() {
        if (esClient == null) {
            esClient = createClient();
        }
        return esClient;
    }

    /**
     * @return a new ES client
     */
    protected JestClient createClient() {
        IESClientFactory factory = createEsClientFactory();
        return factory.createClient(config, getDefaultIndexName());
    }

    /**
     * @return the client factory to use to create the ES client
     */
    protected IESClientFactory createEsClientFactory() {
        String factoryClass = config.get("client.type"); //$NON-NLS-1$
        if ("jest".equals(factoryClass)) { //$NON-NLS-1$
            factoryClass = DefaultESClientFactory.class.getName();
        } else if ("local".equals(factoryClass)) { //$NON-NLS-1$
            factoryClass = LocalClientFactory.class.getName();
        } else if (factoryClass == null) {
            throw new RuntimeException("Invalid elasticsearch client type: " + factoryClass); //$NON-NLS-1$
        }
        
        try {
            return (IESClientFactory) Class.forName(factoryClass).newInstance();
        } catch (InstantiationException | IllegalAccessException | ClassNotFoundException e) {
            throw new RuntimeException("Error creating elasticsearch client type: " + factoryClass, e); //$NON-NLS-1$
        }
    }

    /**
     * Gets the default index name for this component.
     */
    protected abstract String getDefaultIndexName();
    
    /**
     * Gets the index name to use when reading/writing to ES.
     */
    protected String getIndexName() {
        return indexName;
    }

}