libbinder: RPC big 'session' rename

Before, 'connection' was used for a group of TCP connection. This
updates the names for most types to work with the following definitions:

- session - group of connections
- connection - a single tcp connection
- socket - only when referring to a socket being setup for a connection

Bug: N/A
Test: binderRpcTest, binderRpcBenchmark
Change-Id: If07afd9af680cd2a5ece6506df5383e5cc258663
diff --git a/libs/binder/RpcServer.cpp b/libs/binder/RpcServer.cpp
index de7160e..786e2db 100644
--- a/libs/binder/RpcServer.cpp
+++ b/libs/binder/RpcServer.cpp
@@ -149,38 +149,38 @@
         {
             std::lock_guard<std::mutex> _l(mLock);
 
-            sp<RpcConnection> connection;
-            if (id == RPC_CONNECTION_ID_NEW) {
+            sp<RpcSession> session;
+            if (id == RPC_SESSION_ID_NEW) {
                 // new client!
-                LOG_ALWAYS_FATAL_IF(mConnectionIdCounter >= INT32_MAX, "Out of connection IDs");
-                mConnectionIdCounter++;
+                LOG_ALWAYS_FATAL_IF(mSessionIdCounter >= INT32_MAX, "Out of session IDs");
+                mSessionIdCounter++;
 
-                connection = RpcConnection::make();
-                connection->setForServer(wp<RpcServer>::fromExisting(this), mConnectionIdCounter);
+                session = RpcSession::make();
+                session->setForServer(wp<RpcServer>::fromExisting(this), mSessionIdCounter);
 
-                mConnections[mConnectionIdCounter] = connection;
+                mSessions[mSessionIdCounter] = session;
             } else {
-                auto it = mConnections.find(id);
-                if (it == mConnections.end()) {
-                    ALOGE("Cannot add thread, no record of connection with ID %d", id);
+                auto it = mSessions.find(id);
+                if (it == mSessions.end()) {
+                    ALOGE("Cannot add thread, no record of session with ID %d", id);
                     continue;
                 }
-                connection = it->second;
+                session = it->second;
             }
 
-            connection->startThread(std::move(clientFd));
+            session->startThread(std::move(clientFd));
         }
     }
 }
 
-std::vector<sp<RpcConnection>> RpcServer::listConnections() {
+std::vector<sp<RpcSession>> RpcServer::listSessions() {
     std::lock_guard<std::mutex> _l(mLock);
-    std::vector<sp<RpcConnection>> connections;
-    for (auto& [id, connection] : mConnections) {
+    std::vector<sp<RpcSession>> sessions;
+    for (auto& [id, session] : mSessions) {
         (void)id;
-        connections.push_back(connection);
+        sessions.push_back(session);
     }
-    return connections;
+    return sessions;
 }
 
 bool RpcServer::setupSocketServer(const RpcSocketAddress& addr) {