create Proto File

src/main/proto/search.proto

+syntax = "proto3";
+
+option java_multiple_files = true;
+package com.distributed.search.model;
+
+// The search service definition.
+service SearchService {
+
+  // Phase 1: Coordinator requests document statistics from workers.
+  // This is used to calculate the Global Inverse Document Frequency (IDF).
+  rpc GetDocumentStats (StatRequest) returns (StatResponse);
+
+  // Phase 2: Coordinator sends Global IDF to workers and requests
+  // the final TF-IDF scores for a specific set of documents.
+  rpc GetFinalScores (CalculationRequest) returns (SearchResponse);
+}
+
+// Request containing the query terms and the list of documents assigned to a worker.
+message StatRequest {
+  repeated string terms = 1;      // Words the user is searching for
+  int32 start_index = 2;
+  int32 count = 3;
+}
+
+// Response containing the local frequency of terms across the worker's documents.
+message StatResponse {
+  // Key: Search term, Value: Number of documents containing this term locally
+  map<string, int32> term_to_document_count = 1;
+}
+
+// Request sent after the Coordinator calculates the Global IDF for each term.
+message CalculationRequest {
+  repeated string terms = 1;
+  map<string, double> global_idfs = 2; // Key: Search term, Value: Calculated Global IDF
+  int32 start_index = 3;
+  int32 count = 4;
+}
+
+// Response containing the final calculated scores for each document.
+message SearchResponse {
+  message DocumentResult {
+    string document_name = 1;
+    double score = 2;
+  }
+
+  // A list of document names and their corresponding TF-IDF scores
+  repeated DocumentResult results = 1;
+}
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