more optimizations on write side

src/main/java/redis/clients/util/RedisInputStream.java

@@ -0,0 +1,106 @@
+/*
+ * Copyright 2009-2010 MBTE Sweden AB.
+ *
+ * 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 redis.clients.util;
+
+import redis.clients.jedis.JedisException;
+
+import java.io.*;
+
+public class RedisInputStream extends FilterInputStream {
+
+    protected final byte buf[];
+
+    protected int count, limit;
+
+    public RedisInputStream(InputStream in, int size) {
+        super(in);
+        if (size <= 0) {
+            throw new IllegalArgumentException("Buffer size <= 0");
+        }
+        buf = new byte[size];
+    }
+
+    public RedisInputStream(InputStream in) {
+        this(in, 8192);
+    }
+
+    public byte readByte () throws IOException {
+        if(count == limit) {
+            fill ();
+        }
+
+        return buf[count++];
+    }
+
+    public String readLine() {
+        int b;
+        byte c;
+        StringBuilder sb = new StringBuilder();
+
+        try {
+            while (true) {
+                if(count == limit) {
+                    fill ();
+                }
+                if(limit == -1)
+                    break;
+
+                b = buf[count++];
+                if (b == '\r') {
+                    if(count == limit) {
+                        fill ();
+                    }
+
+                    if(limit == -1) {
+                        sb.append((char) b);
+                        break;
+                    }
+
+                    c = buf[count++];
+                    if (c == '\n') {
+                        break;
+                    }
+                    sb.append((char) b);
+                    sb.append((char) c);
+                } else {
+                    sb.append((char) b);
+                }
+            }
+        } catch (IOException e) {
+            throw new JedisException(e);
+        }
+        return sb.toString();
+    }
+
+    @Override
+    public int read(byte[] b, int off, int len) throws IOException {
+        if(count == limit) {
+            fill ();
+            if(limit == -1)
+                return -1;
+        }
+        final int length = Math.min(limit - count, len);
+        System.arraycopy(buf, count, b, off, length);
+        count += length;
+        return length;
+    }
+
+    private void fill () throws IOException {
+        limit = in.read(buf);
+        count = 0;
+    }
+}