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using System;
using System.Collections;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using LiteDB;
namespace Firebase.Database.Offline {
/// <summary>
/// The offline database.
/// </summary>
public class ConcurrentOfflineDatabase : IDictionary<string, OfflineEntry> {
private readonly ConcurrentDictionary<string, OfflineEntry> ccache;
private readonly LiteRepository db;
/// <summary>
/// Initializes a new instance of the <see cref="OfflineDatabase" /> class.
/// </summary>
/// <param name="itemType"> The item type which is used to determine the database file name. </param>
/// <param name="filenameModifier"> Custom string which will get appended to the file name. </param>
public ConcurrentOfflineDatabase(Type itemType, string filenameModifier) {
var fullName = GetFileName(itemType.ToString());
if (fullName.Length > 100) fullName = fullName.Substring(0, 100);
var mapper = BsonMapper.Global;
mapper.Entity<OfflineEntry>().Id(o => o.Key);
var root = Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData);
var filename = fullName + filenameModifier + ".db";
var path = Path.Combine(root, filename);
db = new LiteRepository(new LiteDatabase(path, mapper));
var cache = db.Database
.GetCollection<OfflineEntry>()
.FindAll()
.ToDictionary(o => o.Key, o => o);
ccache = new ConcurrentDictionary<string, OfflineEntry>(cache);
}
/// <summary>
/// Gets the number of elements contained in the <see cref="T:System.Collections.Generic.ICollection`1" />.
/// </summary>
/// <returns> The number of elements contained in the <see cref="T:System.Collections.Generic.ICollection`1" />. </returns>
public int Count => ccache.Count;
/// <summary>
/// Gets a value indicating whether this is a read-only collection.
/// </summary>
public bool IsReadOnly => false;
/// <summary>
/// Gets an <see cref="T:System.Collections.Generic.ICollection`1" /> containing the keys of the
/// <see cref="T:System.Collections.Generic.IDictionary`2" />.
/// </summary>
/// <returns>
/// An <see cref="T:System.Collections.Generic.ICollection`1" /> containing the keys of the object that
/// implements <see cref="T:System.Collections.Generic.IDictionary`2" />.
/// </returns>
public ICollection<string> Keys => ccache.Keys;
/// <summary>
/// Gets an <see cref="T:System.Collections.Generic.ICollection`1" /> containing the values in the
/// <see cref="T:System.Collections.Generic.IDictionary`2" />.
/// </summary>
/// <returns>
/// An <see cref="T:System.Collections.Generic.ICollection`1" /> containing the values in the object that
/// implements <see cref="T:System.Collections.Generic.IDictionary`2" />.
/// </returns>
public ICollection<OfflineEntry> Values => ccache.Values;
/// <summary>
/// Gets or sets the element with the specified key.
/// </summary>
/// <param name="key">The key of the element to get or set.</param>
/// <returns> The element with the specified key. </returns>
public OfflineEntry this[string key] {
get => ccache[key];
set {
ccache.AddOrUpdate(key, value, (k, existing) => value);
db.Upsert(value);
}
}
/// <summary>
/// Returns an enumerator that iterates through the collection.
/// </summary>
/// <returns> An enumerator that can be used to iterate through the collection. </returns>
public IEnumerator<KeyValuePair<string, OfflineEntry>> GetEnumerator() {
return ccache.GetEnumerator();
}
IEnumerator IEnumerable.GetEnumerator() {
return GetEnumerator();
}
/// <summary>
/// Adds an item to the <see cref="T:System.Collections.Generic.ICollection`1" />.
/// </summary>
/// <param name="item">The object to add to the <see cref="T:System.Collections.Generic.ICollection`1" />.</param>
public void Add(KeyValuePair<string, OfflineEntry> item) {
Add(item.Key, item.Value);
}
/// <summary>
/// Removes all items from the <see cref="T:System.Collections.Generic.ICollection`1" />.
/// </summary>
public void Clear() {
ccache.Clear();
db.Delete<OfflineEntry>(LiteDB.Query.All());
}
/// <summary>
/// Determines whether the <see cref="T:System.Collections.Generic.ICollection`1" /> contains a specific value.
/// </summary>
/// <param name="item">The object to locate in the <see cref="T:System.Collections.Generic.ICollection`1" />.</param>
/// <returns>
/// True if <paramref name="item" /> is found in the <see cref="T:System.Collections.Generic.ICollection`1" />;
/// otherwise, false.
/// </returns>
public bool Contains(KeyValuePair<string, OfflineEntry> item) {
return ContainsKey(item.Key);
}
/// <summary>
/// Copies the elements of the <see cref="T:System.Collections.Generic.ICollection`1" /> to an
/// <see cref="T:System.Array" />, starting at a particular <see cref="T:System.Array" /> index.
/// </summary>
/// <param name="array">
/// The one-dimensional <see cref="T:System.Array" /> that is the destination of the elements copied
/// from <see cref="T:System.Collections.Generic.ICollection`1" />. The <see cref="T:System.Array" /> must have
/// zero-based indexing.
/// </param>
/// <param name="arrayIndex">The zero-based index in <paramref name="array" /> at which copying begins.</param>
public void CopyTo(KeyValuePair<string, OfflineEntry>[] array, int arrayIndex) {
ccache.ToList().CopyTo(array, arrayIndex);
}
/// <summary>
/// Removes the first occurrence of a specific object from the
/// <see cref="T:System.Collections.Generic.ICollection`1" />.
/// </summary>
/// <param name="item">The object to remove from the <see cref="T:System.Collections.Generic.ICollection`1" />.</param>
/// <returns>
/// True if <paramref name="item" /> was successfully removed from the
/// <see cref="T:System.Collections.Generic.ICollection`1" />; otherwise, false. This method also returns false if
/// <paramref name="item" /> is not found in the original <see cref="T:System.Collections.Generic.ICollection`1" />.
/// </returns>
public bool Remove(KeyValuePair<string, OfflineEntry> item) {
return Remove(item.Key);
}
/// <summary>
/// Determines whether the <see cref="T:System.Collections.Generic.IDictionary`2" /> contains an element with the
/// specified key.
/// </summary>
/// <param name="key">The key to locate in the <see cref="T:System.Collections.Generic.IDictionary`2" />.</param>
/// <returns>
/// True if the <see cref="T:System.Collections.Generic.IDictionary`2" /> contains an element with the key;
/// otherwise, false.
/// </returns>
public bool ContainsKey(string key) {
return ccache.ContainsKey(key);
}
/// <summary>
/// Adds an element with the provided key and value to the <see cref="T:System.Collections.Generic.IDictionary`2" />.
/// </summary>
/// <param name="key">The object to use as the key of the element to add.</param>
/// <param name="value">The object to use as the value of the element to add.</param>
public void Add(string key, OfflineEntry value) {
ccache.AddOrUpdate(key, value, (k, existing) => value);
db.Upsert(value);
}
/// <summary>
/// Removes the element with the specified key from the <see cref="T:System.Collections.Generic.IDictionary`2" />.
/// </summary>
/// <param name="key">The key of the element to remove.</param>
/// <returns>
/// True if the element is successfully removed; otherwise, false. This method also returns false if
/// <paramref name="key" /> was not found in the original <see cref="T:System.Collections.Generic.IDictionary`2" />.
/// </returns>
public bool Remove(string key) {
ccache.TryRemove(key, out _);
return db.Delete<OfflineEntry>(key);
}
/// <summary>
/// Gets the value associated with the specified key.
/// </summary>
/// <param name="key">The key whose value to get.</param>
/// <param name="value">
/// When this method returns, the value associated with the specified key, if the key is found;
/// otherwise, the default value for the type of the <paramref name="value" /> parameter. This parameter is passed
/// uninitialized.
/// </param>
/// <returns>
/// True if the object that implements <see cref="T:System.Collections.Generic.IDictionary`2" /> contains an
/// element with the specified key; otherwise, false.
/// </returns>
public bool TryGetValue(string key, out OfflineEntry value) {
return ccache.TryGetValue(key, out value);
}
private string GetFileName(string fileName) {
var invalidChars = new[] {'`', '[', ',', '='};
foreach (var c in invalidChars.Concat(Path.GetInvalidFileNameChars()).Distinct())
fileName = fileName.Replace(c, '_');
return fileName;
}
}
}
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