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Diffstat (limited to 'FireBase/Offline/ConcurrentOfflineDatabase.cs')
-rw-r--r-- | FireBase/Offline/ConcurrentOfflineDatabase.cs | 207 |
1 files changed, 207 insertions, 0 deletions
diff --git a/FireBase/Offline/ConcurrentOfflineDatabase.cs b/FireBase/Offline/ConcurrentOfflineDatabase.cs new file mode 100644 index 0000000..226892d --- /dev/null +++ b/FireBase/Offline/ConcurrentOfflineDatabase.cs @@ -0,0 +1,207 @@ +namespace Firebase.Database.Offline +{ + using System; + using System.Collections; + using System.Collections.Concurrent; + using System.Collections.Generic; + using System.IO; + using System.Linq; + + using LiteDB; + + /// <summary> + /// The offline database. + /// </summary> + public class ConcurrentOfflineDatabase : IDictionary<string, OfflineEntry> + { + private readonly LiteRepository db; + private readonly ConcurrentDictionary<string, OfflineEntry> ccache; + + /// <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 = this.GetFileName(itemType.ToString()); + if(fullName.Length > 100) + { + fullName = fullName.Substring(0, 100); + } + + BsonMapper mapper = BsonMapper.Global; + mapper.Entity<OfflineEntry>().Id(o => o.Key); + + string root = Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData); + string filename = fullName + filenameModifier + ".db"; + var path = Path.Combine(root, filename); + this.db = new LiteRepository(new LiteDatabase(path, mapper)); + + var cache = db.Database + .GetCollection<OfflineEntry>() + .FindAll() + .ToDictionary(o => o.Key, o => o); + + this.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 => this.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 => this.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 => this.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 + { + return this.ccache[key]; + } + + set + { + this.ccache.AddOrUpdate(key, value, (k, existing) => value); + this.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 this.ccache.GetEnumerator(); + } + + IEnumerator IEnumerable.GetEnumerator() + { + return this.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) + { + this.Add(item.Key, item.Value); + } + + /// <summary> + /// Removes all items from the <see cref="T:System.Collections.Generic.ICollection`1"/>. + /// </summary> + public void Clear() + { + this.ccache.Clear(); + this.db.Delete<OfflineEntry>(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 this.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) + { + this.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 this.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 this.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) + { + this.ccache.AddOrUpdate(key, value, (k, existing) => value); + this.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) + { + this.ccache.TryRemove(key, out OfflineEntry _); + return this.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 this.ccache.TryGetValue(key, out value); + } + + private string GetFileName(string fileName) + { + var invalidChars = new[] { '`', '[', ',', '=' }; + foreach(char c in invalidChars.Concat(System.IO.Path.GetInvalidFileNameChars()).Distinct()) + { + fileName = fileName.Replace(c, '_'); + } + + return fileName; + } + } +} |