com.nominanuda.solr.SingletonSolrAware.java Source code

Introduction

Here is the source code for com.nominanuda.solr.SingletonSolrAware.java

Source

/*
 * Copyright 2008-2011 the original author or authors.
 * 
 * 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 com.nominanuda.solr;

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

import org.apache.solr.client.solrj.embedded.EmbeddedSolrServer;
import org.apache.solr.core.CloseHook;
import org.apache.solr.core.CoreContainer;
import org.apache.solr.core.SolrCore;
import org.apache.solr.handler.component.ResponseBuilder;
import org.apache.solr.handler.component.SearchComponent;
import org.apache.solr.util.plugin.SolrCoreAware;

public class SingletonSolrAware extends SearchComponent implements SolrCoreAware {
    private static CoreContainer coreContainer;
    private static volatile SingletonSolrAware INSTANCE;
    private Map<String, EmbeddedSolrServer> serverMap = new HashMap<String, EmbeddedSolrServer>();
    private CloseHook closeHook = new CloseHook() {
        @Override
        public void preClose(SolrCore core) {
        }

        @Override
        public void postClose(SolrCore core) {
            INSTANCE = null;
            coreContainer = null;
            serverMap = new HashMap<String, EmbeddedSolrServer>();
        }
    };

    public SingletonSolrAware() {
        if (INSTANCE != null) {
            throw new IllegalStateException("SolrAware already created");
        }
        INSTANCE = this;
    }

    public void inform(SolrCore core) {
        if (coreContainer == null) {
            coreContainer = core.getCoreDescriptor().getCoreContainer();
        }
        core.addCloseHook(closeHook);
    }

    public static SingletonSolrAware getInstance() {
        if (INSTANCE == null) {
            new SingletonSolrAware();
        }
        return INSTANCE;
    }

    public Collection<String> getCoreNames() {
        return coreContainer.getCoreNames();
    }

    public SolrCore getCoreByName(String coreName) {
        return coreContainer.getCore(coreName);
    }

    public synchronized EmbeddedSolrServer getEmbeddedSolrServerByCoreName(String coreName) {
        EmbeddedSolrServer server = serverMap.get(coreName);
        if (server == null) {
            if (coreContainer.getCoreNames().contains(coreName)) {
                server = new EmbeddedSolrServer(coreContainer, coreName);
                serverMap.put(coreName, server);
            } else {
                throw new IllegalArgumentException(coreName + " not found");
            }
        }
        return server;
    }

    @Override
    public void prepare(ResponseBuilder rb) throws IOException {
        throw new UnsupportedOperationException();
    }

    @Override
    public void process(ResponseBuilder rb) throws IOException {
        throw new UnsupportedOperationException();
    }

    @Override
    public String getDescription() {
        return "SolrAware";
    }

    @Override
    public String getSource() {
        throw new UnsupportedOperationException();
    }

    @Override
    public String getVersion() {
        throw new UnsupportedOperationException();
    }

}