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ashish |
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package in.shop2020.thrift.clients.config;
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import in.shop2020.config.ConfigException;
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import in.shop2020.config.Configuration.Client;
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import in.shop2020.utils.Logger;
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import java.io.BufferedReader;
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import java.io.FileNotFoundException;
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import java.io.FileReader;
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import java.net.URL;
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import org.apache.thrift.TException;
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import org.apache.thrift.protocol.TBinaryProtocol;
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import org.apache.thrift.protocol.TProtocol;
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import org.apache.thrift.transport.TFramedTransport;
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import org.apache.thrift.transport.TSocket;
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import org.apache.thrift.transport.TTransport;
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/**
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* The text in file is like
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* config://localhost:9999
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* @author ashish
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*
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*/
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public class ConfigClient {
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private static ConfigClient configClient = null;
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static{
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synchronized (ConfigClient.class) {
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if(configClient == null){
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configClient = new ConfigClient();
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}
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}
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}
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private int PORT_NUMBER = 9999;
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private String HOST = "localhost";
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private final String CONFIG_URL_FILE="/tmp/config.properties";
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private Client client = null;
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public static ConfigClient getClient(){
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return configClient;
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}
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private ConfigClient(){
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try {
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URL url = getConfigServerUrl();
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initClient(url.getHost(), url.getPort());
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} catch (Exception e) {
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Logger.log("Falling back to default options for host and port number ", this);
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initClient(HOST, PORT_NUMBER);
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}
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}
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private URL getConfigServerUrl() throws Exception{
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BufferedReader in = null;
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try {
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in = new BufferedReader(new FileReader(CONFIG_URL_FILE));
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} catch (FileNotFoundException e) {
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Logger.log("Error reading config file "+ CONFIG_URL_FILE +". Please check if file exists", this);
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e.printStackTrace();
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throw e;
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}
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//We read only first line
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String urlString = in.readLine();
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in.close();
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URL url = new URL(urlString);
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return url;
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}
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private void initClient(String host, int port){
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final TSocket tsocket = new TSocket(host, port);
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final TTransport transport = new TFramedTransport(tsocket);
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final TProtocol protocol = new TBinaryProtocol(transport);
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client = new Client(protocol);
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Logger.log("Config Client initialized for host "+ host +" port "+ port, this);
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}
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public String get(String property) throws ConfigException{
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try {
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return client.getPropetry(property);
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} catch (TException e) {
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e.printStackTrace();
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throw new ConfigException(-1, "Encountered exception while obtaining value for "+ property);
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}
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}
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public void set(String property, String value) throws ConfigException{
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try {
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client.loadProperty(property, value);
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} catch (TException e) {
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e.printStackTrace();
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throw new ConfigException(-1, "Encountered exception while putting value "+ value+ "for property "+ property);
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}
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}
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}
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