appengine
java night #2
ProtocolBuffer on HTTP
shin1ogawa@

ApiProxy#getDelegate()
Application Stub
LowLevelAPI
PB
ApiProxy
PB #getDelegate()

Delegate#makeSyncCall()
Service ,Method ,Request(byte[])
ApiProxy
#getDelegate()
#makeSyncCall()
PB(byte[]) Stub/

Server …
• ApiProxy.setDelegate(
Delegate)
ProtocolBuffer
•
ProtocolBuffer

• OreOreDelegate
#makeSyncCall() Stub
•
ApiProxy.getDelegate().makeSyncCall()
• OreOreDelegate
Low-Level API
• Low-Level API Application

ProtocolBuffer on HTTP
Application
LowLevelAPI
PB
PB OreOreServlet
OreOreDelegate
PB

MakeSyncCallServlet
makeSyncCall()
String serviceName =
req.getHeader(SERVICE_NAME);
String methodName = req.getHeader(METHOD_NAME);
byte[] requestBytes =
IOUtils.toByteArray(req.getInputStream());
byte[] responseBytes =
ApiProxy.getDelegate().makeSyncCall(
ApiProxy.getCurrentEnvironment(),
serviceName, methodName, requestBytes);
resp.getOutputStream().write(responseBytes);

MakeSyncCallDelegate
MakeSyncCall
public byte[] makeSyncCall(
Environment environment, String serviceName,
String methodName, byte[] request)
throws ApiProxyException {
return protocolBufferOnHttp(
environment,
serviceName, methodName, request);
}
byte[] protocolBufferOnHttp(.....) {
// makeSyncCall Post byte[]
}

• Datastore
" Datastore
• Datastore
" Datastore
• Memcache
" Memcache

shin1ogawa@