Protocol implementation
This commit is contained in:
Jonathan Leibiusky
106
src/main/java/redis/clients/jedis/Client.java
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106
src/main/java/redis/clients/jedis/Client.java
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package redis.clients.jedis;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.OutputStream;
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import java.net.Socket;
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import java.net.UnknownHostException;
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import redis.clients.jedis.Protocol;
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public class Client {
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private String host;
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private int port = Protocol.DEFAULT_PORT;
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private Socket socket;
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private boolean connected = false;
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private Protocol protocol = new Protocol();
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private OutputStream outputStream;
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private InputStream inputStream;
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public Client(String host) {
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super();
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this.host = host;
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}
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public Client(String host, int port) {
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super();
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this.host = host;
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this.port = port;
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}
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public String getHost() {
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return host;
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}
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public void setHost(String host) {
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this.host = host;
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}
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public int getPort() {
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return port;
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}
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public void setPort(int port) {
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this.port = port;
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}
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public Client() {
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}
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public String ping() {
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String command = protocol.buildCommand("PING");
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try {
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outputStream.write(command.getBytes());
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return protocol.getSingleLineReply(inputStream);
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} catch (IOException e) {
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// TODO Not sure what to do here
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return null;
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}
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}
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public void connect() throws UnknownHostException, IOException {
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if (!connected) {
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socket = new Socket(host, port);
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connected = socket.isConnected();
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outputStream = socket.getOutputStream();
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inputStream = socket.getInputStream();
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}
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}
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public void disconnect() throws IOException {
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if (connected) {
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inputStream.close();
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outputStream.close();
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if (!socket.isClosed()) {
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socket.close();
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}
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connected = false;
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}
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}
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public boolean isConnected() {
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return connected;
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}
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public String set(String key, String value) {
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String command = protocol.buildCommand("SET", key, value);
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try {
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outputStream.write(command.getBytes());
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return protocol.getSingleLineReply(inputStream);
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} catch (IOException e) {
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// TODO Not sure what to do here
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return null;
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}
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}
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public String get(String key) {
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String command = protocol.buildCommand("GET", key);
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try {
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outputStream.write(command.getBytes());
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return protocol.getBulkReply(inputStream);
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} catch (IOException e) {
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// TODO Not sure what to do here
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return null;
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}
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}
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}
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116
src/main/java/redis/clients/jedis/Protocol.java
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116
src/main/java/redis/clients/jedis/Protocol.java
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@@ -0,0 +1,116 @@
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package redis.clients.jedis;
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import java.io.IOException;
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import java.io.InputStream;
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import java.util.ArrayList;
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import java.util.List;
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public class Protocol {
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public static final String DOLLAR = "$";
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public static final String ASTERISK = "*";
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public static final String PLUS = "+";
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public static final String COLON = ":";
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public static final String COMMAND_DELIMITER = "\r\n";
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public static final int DEFAULT_PORT = 6379;
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public static final byte DOLLAR_BYTE = DOLLAR.getBytes()[0];
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public static final byte ASTERISK_BYTE = ASTERISK.getBytes()[0];
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public static final byte PLUS_BYTE = PLUS.getBytes()[0];
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public static final byte COLON_BYTE = COLON.getBytes()[0];
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public String buildCommand(String name, String... args) {
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StringBuilder builder = new StringBuilder();
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builder.append(ASTERISK).append(args.length + 1).append(
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COMMAND_DELIMITER);
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builder.append(DOLLAR).append(name.length()).append(COMMAND_DELIMITER);
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builder.append(name).append(COMMAND_DELIMITER);
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for (String arg : args) {
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builder.append(DOLLAR).append(arg.length()).append(
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COMMAND_DELIMITER).append(arg).append(COMMAND_DELIMITER);
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}
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return builder.toString();
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}
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public String getBulkReply(InputStream is) {
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String ret = null;
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try {
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if ((byte) is.read() == DOLLAR_BYTE) {
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int len = Integer.parseInt(readLine(is));
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if (len == -1) {
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return null;
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}
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byte[] read = new byte[len];
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is.read(read);
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// read 2 more bytes for the command delimiter
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is.read();
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is.read();
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ret = new String(read);
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}
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} catch (IOException e) {
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// TODO Not sure that I should return null
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return null;
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}
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return ret;
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}
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private String readLine(InputStream is) throws IOException {
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byte b;
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StringBuilder sb = new StringBuilder();
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while ((b = (byte) is.read()) != -1) {
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if (b == '\r') {
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b = (byte) is.read();
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if (b == '\n') {
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break;
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}
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}
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sb.append((char) b);
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}
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return sb.toString();
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}
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public String getSingleLineReply(InputStream is) {
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String ret = null;
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try {
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if ((byte) is.read() == PLUS_BYTE) {
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ret = readLine(is);
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}
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} catch (IOException e) {
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// TODO Not sure that I should return null
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return null;
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}
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return ret;
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}
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public int getIntegerReply(InputStream is) {
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int ret = 0;
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try {
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if ((byte) is.read() == COLON_BYTE) {
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String num = readLine(is);
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ret = Integer.parseInt(num);
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}
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} catch (IOException e) {
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// TODO Not sure that I should return 0
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return 0;
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}
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return ret;
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}
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public List<String> getMultiBulkReply(InputStream is) {
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List<String> ret = new ArrayList<String>();
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try {
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if ((byte) is.read() == ASTERISK_BYTE) {
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int num = Integer.parseInt(readLine(is));
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for (int i = 0; i < num; i++) {
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ret.add(getBulkReply(is));
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}
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}
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} catch (IOException e) {
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// TODO Not sure that I should return null
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return null;
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}
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return ret;
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}
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}
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