[#32] Provide a pool of clients to grpc

Signed-off-by: Ori Bruk <o.bruk@yadro.com>

client/src/main/java/info/frostfs/sdk/pool/MethodStatus.java

@@ -0,0 +1,31 @@
+package info.frostfs.sdk.pool;
+
+import lombok.AccessLevel;
+import lombok.Getter;
+import lombok.Setter;
+
+import java.util.concurrent.locks.ReentrantLock;
+
+@Setter
+@Getter
+public class MethodStatus {
+    @Getter(AccessLevel.NONE)
+    private final ReentrantLock lock = new ReentrantLock();
+    private final String name;
+    private StatusSnapshot snapshot;
+
+    public MethodStatus(String name) {
+        this.name = name;
+        this.snapshot = new StatusSnapshot();
+    }
+
+    void incRequests(long elapsed) {
+        lock.lock();
+        try {
+            snapshot.setAllTime(snapshot.getAllTime() + elapsed);
+            snapshot.setAllRequests(snapshot.getAllRequests() + 1);
+        } finally {
+            lock.unlock();
+        }
+    }
+}