implemented memcached client with Netty

gbcs-common/build.gradle

@@ -9,6 +9,7 @@ dependencies {
     implementation project(':gbcs-api')
     implementation catalog.slf4j.api
     implementation catalog.jwo
+    implementation catalog.netty.buffer
 }
 
 publishing {

gbcs-common/src/main/java/module-info.java

@@ -4,6 +4,7 @@ module net.woggioni.gbcs.common {
     requires org.slf4j;
     requires kotlin.stdlib;
     requires net.woggioni.jwo;
+    requires io.netty.buffer;
 
     provides java.net.spi.URLStreamHandlerProvider with net.woggioni.gbcs.common.GbcsUrlStreamHandlerFactory;
     exports net.woggioni.gbcs.common;

gbcs-common/src/main/kotlin/net/woggioni/gbcs/common/ByteBufInputStream.kt

@@ -0,0 +1,25 @@
+package net.woggioni.gbcs.common
+
+import io.netty.buffer.ByteBuf
+import java.io.InputStream
+
+class ByteBufInputStream(private val buf : ByteBuf) : InputStream() {
+    override fun read(): Int {
+        return buf.takeIf {
+            it.readableBytes() > 0
+        }?.let(ByteBuf::readByte)
+            ?.let(Byte::toInt) ?: -1
+    }
+
+    override fun read(b: ByteArray, off: Int, len: Int): Int {
+        val readableBytes = buf.readableBytes()
+        if(readableBytes == 0) return -1
+        val result = len.coerceAtMost(readableBytes)
+        buf.readBytes(b, off, result)
+        return result
+    }
+
+    override fun close() {
+        buf.release()
+    }
+}

gbcs-common/src/main/kotlin/net/woggioni/gbcs/common/GbcsUrlStreamHandlerFactory.kt

@@ -5,7 +5,6 @@ import java.io.InputStream
 import java.net.URL
 import java.net.URLConnection
 import java.net.URLStreamHandler
-import java.net.URLStreamHandlerFactory
 import java.net.spi.URLStreamHandlerProvider
 import java.util.Optional
 import java.util.concurrent.atomic.AtomicBoolean