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Program.cs
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Program.cs
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// Copyright(c) 2017 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy of
// the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
using CommandLine;
using Google.Cloud.Firestore;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Threading.Tasks;
using System.Threading;
using System.Linq;
namespace GoogleCloudSamples
{
public class ListenData
{
public static string Usage = @"Usage:
C:\> dotnet run command YOUR_PROJECT_ID
Where command is one of
listen-document
listen-multiple
listen-for-changes
";
private static async Task ListenDocument(string project)
{
FirestoreDb db = FirestoreDb.Create(project);
// [START fs_listen_document]
DocumentReference docRef = db.Collection("cities").Document("SF");
FirestoreChangeListener listener = docRef.Listen(snapshot =>
{
Console.WriteLine("Callback received document snapshot.");
Console.WriteLine("Document exists? {0}", snapshot.Exists);
if (snapshot.Exists)
{
Console.WriteLine("Document data for {0} document:", snapshot.Id);
Dictionary<string, object> city = snapshot.ToDictionary();
foreach (KeyValuePair<string, object> pair in city)
{
Console.WriteLine("{0}: {1}", pair.Key, pair.Value);
}
}
});
// [END fs_listen_document]
// Create a new document at cities/SF to demonstrate realtime listener
Console.WriteLine("Creating document");
Dictionary<string, object> cityObject = new Dictionary<string, object>
{
{ "Name", "San Francisco" },
{ "State", "CA" },
{ "Country", "USA" },
{ "Capital", false },
{ "Population", 860000 }
};
await docRef.CreateAsync(cityObject);
await Task.Delay(1000);
// Stop the listener when you no longer want to receive updates.
Console.WriteLine("Stopping the listener");
// [START fs_detach_listener]
await listener.StopAsync();
// [END fs_detach_listener]
}
private static async Task ListenMultiple(string project)
{
FirestoreDb db = FirestoreDb.Create(project);
// [START fs_listen_multiple]
CollectionReference citiesRef = db.Collection("cities");
Query query = db.Collection("cities").WhereEqualTo("State", "CA");
FirestoreChangeListener listener = query.Listen(snapshot =>
{
Console.WriteLine("Callback received query snapshot.");
Console.WriteLine("Current cities in California:");
foreach (DocumentSnapshot documentSnapshot in snapshot.Documents)
{
Console.WriteLine(documentSnapshot.Id);
}
});
// [END fs_listen_multiple]
// Create a new document at cities/LA to demonstrate realtime listener
Console.WriteLine("Creating document");
DocumentReference docRef = db.Collection("cities").Document("LA");
Dictionary<string, object> cityObject = new Dictionary<string, object>
{
{ "Name", "Los Angeles" },
{ "State", "CA" },
{ "Country", "USA" },
{ "Capital", false },
{ "Population", 3900000 }
};
await docRef.CreateAsync(cityObject);
await Task.Delay(1000);
// Stop the listener when you no longer want to receive updates.
Console.WriteLine("Stopping the listener");
await listener.StopAsync();
}
private static async Task ListenForChanges(string project)
{
FirestoreDb db = FirestoreDb.Create(project);
// [START fs_listen_for_changes]
CollectionReference citiesRef = db.Collection("cities");
Query query = db.Collection("cities").WhereEqualTo("State", "CA");
FirestoreChangeListener listener = query.Listen(snapshot =>
{
foreach (DocumentChange change in snapshot.Changes)
{
if (change.ChangeType.ToString() == "Added")
{
Console.WriteLine("New city: {0}", change.Document.Id);
}
else if (change.ChangeType.ToString() == "Modified")
{
Console.WriteLine("Modified city: {0}", change.Document.Id);
}
else if (change.ChangeType.ToString() == "Removed")
{
Console.WriteLine("Removed city: {0}", change.Document.Id);
}
}
});
// [END fs_listen_for_changes]
// Create a new document at cities/MTV to demonstrate realtime listener
Console.WriteLine("Creating document");
DocumentReference docRef = db.Collection("cities").Document("MTV");
Dictionary<string, object> cityObject = new Dictionary<string, object>
{
{ "Name", "Mountain View" },
{ "State", "CA" },
{ "Country", "USA" },
{ "Capital", false },
{ "Population", 80000 }
};
await docRef.CreateAsync(cityObject);
await Task.Delay(1000);
// Modify the cities/MTV document to demonstrate detection of the 'Modified change
Console.WriteLine("Modifying document");
Dictionary<string, object> city = new Dictionary<string, object>
{
{ "Name", "Mountain View" },
{ "State", "CA" },
{ "Country", "USA" },
{ "Capital", false },
{ "Population", 90000 }
};
await docRef.SetAsync(city);
await Task.Delay(1000);
// Modify the cities/MTV document to demonstrate detection of the 'Modified change
Console.WriteLine("Deleting document");
await docRef.DeleteAsync();
await Task.Delay(1000);
// Stop the listener when you no longer want to receive updates.
Console.WriteLine("Stopping the listener");
await listener.StopAsync();
}
public static void Main(string[] args)
{
if (args.Length < 2)
{
Console.Write(Usage);
return;
}
string command = args[0].ToLower();
string project = string.Join(" ",
new ArraySegment<string>(args, 1, args.Length - 1));
switch (command)
{
case "listen-document":
ListenDocument(project).Wait();
break;
case "listen-multiple":
ListenMultiple(project).Wait();
break;
case "listen-for-changes":
ListenForChanges(project).Wait();
break;
default:
Console.Write(Usage);
return;
}
}
}
}