diff --git a/src/test/java/org/gcube/lb2pc/HttpMethod.java b/src/test/java/org/gcube/lb2pc/HttpMethod.java
new file mode 100644
index 0000000..c09fe0b
--- /dev/null
+++ b/src/test/java/org/gcube/lb2pc/HttpMethod.java
@@ -0,0 +1,5 @@
+package org.gcube.lb2pc;
+
+public enum HttpMethod {
+	POST, GET, PUT, DELETE, OPTIONS, HEAD, TRACE, CONNECT
+}
\ No newline at end of file
diff --git a/src/test/java/org/gcube/lb2pc/HttpRequest.java b/src/test/java/org/gcube/lb2pc/HttpRequest.java
new file mode 100644
index 0000000..1afa9dd
--- /dev/null
+++ b/src/test/java/org/gcube/lb2pc/HttpRequest.java
@@ -0,0 +1,38 @@
+package org.gcube.lb2pc;
+
+public class HttpRequest {
+	
+	/**
+	 * 
+	 */
+	private final Proxy ok;
+
+	/**
+	 * @param proxy
+	 */
+	HttpRequest(Proxy proxy) {
+		ok = proxy;
+	}
+
+	public String getHeader(String string) {
+		return null;
+	}
+	
+	public String getRequestURI() {
+		return null;
+	}
+	
+	public HttpMethod getMethod() {
+		return null;
+	}
+	
+	public String getContentType() {
+		return null;
+	}
+	
+	public String getContent() {
+		// TODO Auto-generated method stub
+		return null;
+	}
+	
+}
\ No newline at end of file
diff --git a/src/test/java/org/gcube/lb2pc/HttpResponse.java b/src/test/java/org/gcube/lb2pc/HttpResponse.java
new file mode 100644
index 0000000..57611df
--- /dev/null
+++ b/src/test/java/org/gcube/lb2pc/HttpResponse.java
@@ -0,0 +1,32 @@
+package org.gcube.lb2pc;
+
+import java.util.Collection;
+
+public class HttpResponse {
+	
+	public String getHeader(String string) {
+		return null;
+	}
+	
+	public Collection<String> getHeaderNames() {
+		return null;
+	}
+	
+	public String getContentType() {
+		return null;
+	}
+	
+	public String getContent() {
+		return null;
+	}
+	
+	public HttpStatusCode getHttpStatusCode() {
+		return null;
+	}
+	
+	public void setHeader(String string, String lockURI) {
+		// TODO Auto-generated method stub
+		
+	}
+	
+}
diff --git a/src/test/java/org/gcube/lb2pc/HttpStatusCode.java b/src/test/java/org/gcube/lb2pc/HttpStatusCode.java
new file mode 100644
index 0000000..1e5ccb5
--- /dev/null
+++ b/src/test/java/org/gcube/lb2pc/HttpStatusCode.java
@@ -0,0 +1,32 @@
+package org.gcube.lb2pc;
+
+public enum HttpStatusCode {
+	
+	// 2×× Success
+	_200(200, "OK"), _201(201, "Created"), _204(204, "No Content"),
+	
+	// 4×× Client Error
+	_400(400, "Bad Request"), _401(401, "Unauthorized"), _403(403, "Forbidden"), _404(404, "Not Found"), 
+	_405(405, "Method Not Allowed"), _406(406, "Not Acceptable"), _408(408, "Request Timeout"),
+	_423(423, "Locked"),
+	
+	// 5×× Server Error
+	_500(500, "Internal Server Error"), _503(503, "Service Unavailable");
+	
+	private int code;
+	private String messageCode;
+	
+	private HttpStatusCode(int code, String messageCode) {
+		this.code = code;
+		this.messageCode = messageCode;
+	}
+	
+	public int getCode() {
+		return code;
+	}
+	
+	public String getMessageCode() {
+		return messageCode;
+	}
+	
+}
\ No newline at end of file
diff --git a/src/test/java/org/gcube/lb2pc/Lock.java b/src/test/java/org/gcube/lb2pc/Lock.java
new file mode 100644
index 0000000..2968e5b
--- /dev/null
+++ b/src/test/java/org/gcube/lb2pc/Lock.java
@@ -0,0 +1,100 @@
+package org.gcube.lb2pc;
+
+public class Lock {
+	
+	protected String lockURI;
+	
+	protected LockType type;
+	protected String transactionURI;
+	protected String resourceURI;
+	
+	protected String contentType;
+	
+	public Lock(LockType type, String transactionURI, String resourceURI) {
+		super();
+		this.type = type;
+		this.transactionURI = transactionURI;
+		this.resourceURI = resourceURI;
+	}
+	
+	public Lock(String lockURI) {
+		this.lockURI = lockURI;
+	}
+	
+	public LockType getType() {
+		return type;
+	}
+	
+	public void setType(LockType type) {
+		this.type = type;
+	}
+	
+	public String getTransactionURI() {
+		return transactionURI;
+	}
+	
+	public void setTransactionURI(String transactionURI) {
+		this.transactionURI = transactionURI;
+	}
+	
+	public String getResourceURI() {
+		return resourceURI;
+	}
+	
+	public void setResourceURI(String resourceURI) {
+		this.resourceURI = resourceURI;
+	}
+	
+	public String getLockURI() {
+		return lockURI;
+	}
+	
+	public String getContentType() {
+		return contentType;
+	}
+	
+	public void setContentType(String contentType) {
+		this.contentType = contentType;
+	}
+	
+	public void setLockURI(String lockURI) {
+		this.lockURI = lockURI;
+	}
+	
+	public void create() {
+		
+	}
+	
+	public void read(String contentType) {
+		this.contentType = contentType;
+		
+		HttpResponse lockResponse = Proxy.createHttpRequest(HttpMethod.GET, contentType, lockURI);
+		if(lockResponse.getHttpStatusCode() != HttpStatusCode._200) {
+			// Lock Not Found or any error which does not allow to proceed
+			Proxy.sendErrorResponseToClient(HttpStatusCode._401, "Provided Lock does not exist");
+		}
+		
+		unmarshalContent(lockResponse.getContent(), contentType);
+	}
+	
+	private void unmarshalContent(String content, String contentType) {
+		// Set fields
+	}
+	
+	public void upgrade() {
+		if(type == LockType.X) {
+			return;
+		}
+		
+		type = LockType.S;
+		
+		HttpResponse lockResponse = Proxy.createHttpRequest(HttpMethod.PUT, contentType, lockURI);
+		
+		
+	}
+	
+	public void delete() {
+		HttpResponse lockResponse = Proxy.createHttpRequest(HttpMethod.DELETE, null, lockURI);
+		
+	}
+}
diff --git a/src/test/java/org/gcube/lb2pc/LockType.java b/src/test/java/org/gcube/lb2pc/LockType.java
new file mode 100644
index 0000000..ffc2311
--- /dev/null
+++ b/src/test/java/org/gcube/lb2pc/LockType.java
@@ -0,0 +1,5 @@
+package org.gcube.lb2pc;
+
+public enum LockType {
+	S, X
+}
\ No newline at end of file
diff --git a/src/test/java/org/gcube/lb2pc/Log.java b/src/test/java/org/gcube/lb2pc/Log.java
new file mode 100644
index 0000000..24a1286
--- /dev/null
+++ b/src/test/java/org/gcube/lb2pc/Log.java
@@ -0,0 +1,81 @@
+package org.gcube.lb2pc;
+
+import java.net.MalformedURLException;
+import java.net.URL;
+
+public class Log {
+	
+	protected HttpMethod operation;
+	protected String resource;
+	protected URL locationURI;
+	
+	protected String contentType;
+	protected String shadowResourceURI;
+	
+	public Log(HttpMethod httpMethod) {
+		super();
+		this.operation = httpMethod;
+		this.resource = null;
+	}
+	
+	public Log(HttpMethod httpMethod, String resource, String locationURI) throws MalformedURLException {
+		super();
+		this.operation = httpMethod;
+		this.resource = resource;
+		this.locationURI = new URL(locationURI);
+	}
+	
+	public HttpMethod getOperation() {
+		return operation;
+	}
+
+	public void setOperation(HttpMethod operation) {
+		this.operation = operation;
+	}
+
+	public String getResource() {
+		return resource;
+	}
+
+	public void setResource(String resource) {
+		this.resource = resource;
+	}
+
+	public String getContentType() {
+		return contentType;
+	}
+
+	public void setContentType(String contentType) {
+		this.contentType = contentType;
+	}
+
+	public String getShadowResourceURI() {
+		return shadowResourceURI;
+	}
+
+	public void setShadowResourceURI(String shadowResourceURI) {
+		this.shadowResourceURI = shadowResourceURI;
+	}
+
+	public void create(String shadowResourceURI, String contentType) {
+		this.contentType = contentType;
+		this.shadowResourceURI = shadowResourceURI;
+		
+		HttpResponse logResponse = Proxy.createHttpRequest(HttpMethod.POST, contentType, getLogCollectionURI());
+		if(logResponse.getHttpStatusCode() != HttpStatusCode._201) {
+			// Unable to create log. This does not allow to proceed
+			Proxy.sendErrorResponseToClient(HttpStatusCode._401, "Provided Lock does not exist");
+		}
+		
+		unmarshalContent(this, logResponse.getContent(), contentType);
+	}
+	
+	protected String getLogCollectionURI() {
+		return shadowResourceURI + "/operations";
+	}
+	
+	public static void unmarshalContent(Log operationLog, String content, String contentType) {
+		// Set fields
+	}
+	
+}
diff --git a/src/test/java/org/gcube/lb2pc/Proxy.java b/src/test/java/org/gcube/lb2pc/Proxy.java
new file mode 100644
index 0000000..3e32053
--- /dev/null
+++ b/src/test/java/org/gcube/lb2pc/Proxy.java
@@ -0,0 +1,229 @@
+package org.gcube.lb2pc;
+
+import java.net.MalformedURLException;
+
+public class Proxy {
+	
+	public HttpResponse service(HttpRequest request) throws Exception {
+		
+		HttpMethod httpMethod = request.getMethod();
+		
+		if(httpMethod == HttpMethod.OPTIONS) {
+			sendTransactionServerList();
+		}
+		
+		String transactionURI = request.getHeader("X-Transaction-URI");
+		String requestURI = request.getRequestURI();
+		String contentType = "application/json";
+		
+		if(transactionURI!=null) {
+			// Transactional Client
+						
+			if(request.getHeader("Accept")!=null) {
+				contentType = request.getHeader("Accept");
+			}
+			
+			
+			String lockURI = request.getHeader("X-Lock-URI");
+			
+			if(lockURI!=null) {
+				// Client already own a lock, verifying and upgrading if needed
+				verifyAndUpgradeLock(httpMethod, contentType, lockURI, transactionURI, requestURI);
+				
+				String shadowResourceURI = ShadowResource.getShadowResourceURI(transactionURI, requestURI);
+				logRequest(shadowResourceURI, contentType, httpMethod, null);
+					
+				HttpResponse actionResponse = forwardAction(request);
+				
+				actionResponse.setHeader("X-Lock-URI", lockURI);
+				actionResponse.setHeader("X-Transaction-URI", transactionURI);
+				return replyToClient(actionResponse);
+				
+			}else {
+				// Client does not own a lock
+				
+				if(httpMethod != HttpMethod.POST && httpMethod != HttpMethod.PUT && 
+					httpMethod != HttpMethod.GET && httpMethod != HttpMethod.HEAD) {
+					// The first action on a resource must be a GET or a CREATE
+					sendErrorResponseToClient(HttpStatusCode._403, "A resource must be read before to be able to modify or delete it.");
+				}
+				
+				HttpResponse actionResponse = null;
+				
+				Lock lock = createLock(httpMethod, transactionURI, requestURI);
+				lockURI = lock.getLockURI();
+				
+				String resource = null;
+				String shadowResourceURI= null;
+				
+				switch(httpMethod) {
+					case PUT:
+						
+						HttpResponse r = createHttpRequest(HttpMethod.HEAD, null, null, requestURI);
+						if(r.getHttpStatusCode() == HttpStatusCode._204 || (r.getHttpStatusCode().getCode()>=200 && r.getHttpStatusCode().getCode()<300)) {
+							lock.delete();
+							sendErrorResponseToClient(HttpStatusCode._403, "A resource must be read before to be able to modify or delete it.");
+						}else {
+							// Create with PUT
+							shadowResourceURI = createShadowResource(transactionURI, requestURI, lockURI, contentType, null);
+							logRequest(shadowResourceURI, contentType, httpMethod, request.getContent());
+							actionResponse = forwardAction(request);
+						}
+						break;
+					
+					case POST:
+						HttpResponse getResponse = getResourceOnEffectiveService(requestURI);
+						resource = getResponse.getContent();
+						
+						shadowResourceURI = createShadowResource(transactionURI, requestURI, lockURI, contentType, resource);
+						logRequest(shadowResourceURI, contentType, httpMethod, request.getContent());
+						
+						actionResponse = forwardAction(request);
+						
+						String locationURI = actionResponse.getHeader("Location");
+						logRequest(shadowResourceURI, contentType, httpMethod, null, locationURI);
+						
+						break;
+						
+					default:
+						
+						HttpResponse response = getResourceOnEffectiveService(requestURI);
+						resource = response.getContent();
+						
+						shadowResourceURI = createShadowResource(transactionURI, requestURI, lockURI, contentType, resource);
+						
+						// We don't need any log
+						// logRequest(shadowResourceURI, contentType, httpMethod, requestURI, request.getContent());
+						
+						actionResponse = forwardAction(request);
+						
+						break;
+				}
+				
+				actionResponse.setHeader("X-Lock-URI", lockURI);
+				
+				actionResponse.setHeader("X-Transaction-URI", transactionURI);
+
+				return replyToClient(actionResponse);
+			}
+			
+			
+		}else {
+			// Non-Transactional Client
+			return createMiniTransaction();
+		}
+		
+	}
+	
+	private void logRequest(String shadowResourceURI, String contentType, HttpMethod httpMethod, String resource)
+			throws MalformedURLException {
+		this.logRequest(shadowResourceURI, contentType, httpMethod, resource, null);
+	}
+	
+	private void logRequest(String shadowResourceURI, String contentType, HttpMethod httpMethod, String resource, String locationURI) throws MalformedURLException {
+		Log log = new Log(httpMethod, resource, locationURI);
+		log.create(shadowResourceURI, contentType);
+	}
+
+	private HttpResponse createMiniTransaction() {
+		// TODO Auto-generated method stub
+		return null;
+	}
+	
+	private void sendTransactionServerList() {
+		// TODO Auto-generated method stub
+		
+	}
+	
+	private static HttpResponse replyToClient(HttpResponse actionResponse) {
+		return null;
+	}
+	
+	private static HttpResponse forwardAction(HttpRequest request) {
+		return null;
+	}
+	
+	private HttpResponse getResourceOnEffectiveService(String resourceURI) {
+		return null;
+	}
+	
+	private String createShadowResource(String transactionURI, String requestURI, String lockURI, String contentType,
+			String resource) throws MalformedURLException {
+		ShadowResource shadowResource = new ShadowResource(transactionURI, requestURI, lockURI, contentType);
+		shadowResource.create();
+		return shadowResource.getURI();
+	}
+	
+	protected Lock createLock(HttpMethod httpMethod, String transacationURI, String resourceURI) {
+		LockType type = getRequiredType(httpMethod);
+		Lock lock = new Lock(type, transacationURI, resourceURI);
+		lock.create();
+		return lock;
+	}
+	
+	private LockType getRequiredType(HttpMethod httpMethod) {
+		return null;
+	}
+	
+	protected void verifyAndUpgradeLock(HttpMethod httpMethod, String contentType, String lockURI,
+			String transactionURI, String resourceURI) {
+		Lock lock = retrieveLock(lockURI, contentType);
+		
+		if(lock.getTransactionURI().compareTo(transactionURI) != 0) {
+			// Invalid Lock e.g. the lock does not belong to the transaction or does not exist
+			sendErrorResponseToClient(HttpStatusCode._401, "Provided Lock does belong to provided Transaction");
+		}
+		
+		if(lock.getResourceURI().compareTo(resourceURI) != 0) {
+			sendErrorResponseToClient(HttpStatusCode._401, "Provided Lock does belong to requested URI");
+		}
+		
+		if(lock.type == LockType.S) {
+			if(httpMethod != HttpMethod.GET) {
+				upgradeLock(lock, lockURI);
+				// lock.upgrade();
+			}
+		}
+		
+	}
+	
+	public static void sendErrorResponseToClient(HttpStatusCode name, String string) {
+		return;
+	}
+	
+	/**
+	 * GET lock from LockURI
+	 * @param lockURI
+	 * @return
+	 */
+	private Lock retrieveLock(String lockURI, String contentType) {
+		Lock lock = new Lock(lockURI);
+		lock.read(contentType);
+		return lock;
+	}
+	
+	public static HttpResponse createHttpRequest(HttpMethod get, String contentType, String uri) {
+		return null;
+	}
+	
+	public static HttpResponse createHttpRequest(HttpMethod get, String contentType, String content, String uri) {
+		return null;
+	}
+	
+	protected Lock upgradeLock(Lock lock, String lockURI) {
+		if(lock.getType() == LockType.X) {
+			return lock;
+		}
+		
+		lock.setType(LockType.S);
+		
+		sendLockUpdate(lock, lockURI);
+		
+		return lock;
+	}
+	
+	private void sendLockUpdate(Lock lock, String lockURI) {
+		return;
+	}
+	
+}
diff --git a/src/test/java/org/gcube/lb2pc/ShadowResource.java b/src/test/java/org/gcube/lb2pc/ShadowResource.java
new file mode 100644
index 0000000..afdb0e5
--- /dev/null
+++ b/src/test/java/org/gcube/lb2pc/ShadowResource.java
@@ -0,0 +1,110 @@
+package org.gcube.lb2pc;
+
+import java.net.MalformedURLException;
+import java.net.URL;
+
+public class ShadowResource {
+	
+	protected String transactionURI;
+	protected String requestURI;
+	protected String lockURI;
+	protected String contentType;
+	protected String content;
+	
+	public ShadowResource(String transactionURI, String requestURI, String lockURI, String contentType) {
+		super();
+		this.transactionURI = transactionURI;
+		this.requestURI = requestURI;
+		this.lockURI = lockURI;
+		this.contentType = contentType;
+	}
+
+	public ShadowResource(String transactionURI, String requestURI, String lockURI, String contentType,
+			String content) {
+		super();
+		this.transactionURI = transactionURI;
+		this.requestURI = requestURI;
+		this.lockURI = lockURI;
+		this.contentType = contentType;
+		this.content = content;
+	}
+
+	public String getTransactionURI() {
+		return transactionURI;
+	}
+
+	public void setTransactionURI(String transactionURI) {
+		this.transactionURI = transactionURI;
+	}
+
+	public String getRequestURI() {
+		return requestURI;
+	}
+
+	public void setRequestURI(String requestURI) {
+		this.requestURI = requestURI;
+	}
+
+	public String getLockURI() {
+		return lockURI;
+	}
+
+	public void setLockURI(String lockURI) {
+		this.lockURI = lockURI;
+	}
+
+	public String getContentType() {
+		return contentType;
+	}
+
+	public void setContentType(String contentType) {
+		this.contentType = contentType;
+	}
+
+	public String getContent() {
+		return content;
+	}
+
+	public void setContent(String content) {
+		this.content = content;
+	}
+	
+	public void create() throws MalformedURLException {
+		String shadowResourceURI = getURI();
+		HttpResponse response = Proxy.createHttpRequest(HttpMethod.PUT, contentType, marshall(), shadowResourceURI);
+		if(response.getHttpStatusCode() != HttpStatusCode._201) {
+			Proxy.sendErrorResponseToClient(HttpStatusCode._403, "Unable to fullfill request");
+		}
+	}
+	
+	protected String marshall() {
+		return null;
+	}
+	
+	protected String getURI() throws MalformedURLException {
+		return getShadowResourceURI(transactionURI, requestURI);
+	}
+	
+	protected static String getPath(String uri) throws MalformedURLException {
+		URL url = new URL(uri);
+		return url.getPath();
+	}
+	
+	public static String getShadowResourceURI(String transactionURI, String resourceURI) throws MalformedURLException {
+		String path = getPath(resourceURI);
+		
+		if(path.contains("/operations/")) {
+			path.replace("/operations/", "/_operations/");
+		}
+		
+		if(path.endsWith("/operations")) {
+			path.replace("/operations", "/_operations");
+		}
+		
+		if(transactionURI.endsWith("/")) {
+			transactionURI = transactionURI.substring(0, transactionURI.length() - 2);
+		}
+		
+		return transactionURI + path;
+	}
+}
diff --git a/src/test/java/org/gcube/lb2pc/Utility.java b/src/test/java/org/gcube/lb2pc/Utility.java
new file mode 100644
index 0000000..51acc56
--- /dev/null
+++ b/src/test/java/org/gcube/lb2pc/Utility.java
@@ -0,0 +1,5 @@
+package org.gcube.lb2pc;
+
+public class Utility {
+	
+}