blob: ea48dc2691ba911e154d3e3bb1c3045e1f52da9d (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
|
package com.earth2me.essentials.storage;
import com.earth2me.essentials.api.IEssentials;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.locks.ReentrantReadWriteLock;
import java.util.logging.Level;
import org.bukkit.Bukkit;
public abstract class AsyncStorageObjectHolder<T extends StorageObject> implements IStorageObjectHolder<T>
{
private transient T data;
private final transient ReentrantReadWriteLock rwl = new ReentrantReadWriteLock();
private final transient Class<T> clazz;
protected final transient IEssentials ess;
private final transient StorageObjectDataWriter writer;
private final transient StorageObjectDataReader reader;
private final transient AtomicBoolean loaded = new AtomicBoolean(false);
public AsyncStorageObjectHolder(final IEssentials ess, final Class<T> clazz)
{
this.ess = ess;
this.clazz = clazz;
writer = new StorageObjectDataWriter();
reader = new StorageObjectDataReader();
try
{
this.data = clazz.newInstance();
}
catch (Exception ex)
{
Bukkit.getLogger().log(Level.SEVERE, ex.getMessage(), ex);
}
}
/**
* Warning: If you access this method, you have to acquire a read or write lock first
*
*
* @return Object storing all the data
*/
@Override
public T getData()
{
if (!loaded.get())
{
reader.schedule(true);
}
return data;
}
@Override
public void acquireReadLock()
{
rwl.readLock().lock();
}
@Override
public void acquireWriteLock()
{
while (rwl.getReadHoldCount() > 0)
{
rwl.readLock().unlock();
}
rwl.writeLock().lock();
rwl.readLock().lock();
}
@Override
public void close()
{
unlock();
}
@Override
public void unlock()
{
if (rwl.isWriteLockedByCurrentThread())
{
rwl.writeLock().unlock();
writer.schedule();
}
while (rwl.getReadHoldCount() > 0)
{
rwl.readLock().unlock();
}
}
@Override
public void onReload()
{
onReload(true);
}
public void onReload(final boolean instant)
{
reader.schedule(instant);
}
public abstract void finishRead();
public abstract void finishWrite();
public abstract File getStorageFile() throws IOException;
private class StorageObjectDataWriter extends AbstractDelayedYamlFileWriter
{
public StorageObjectDataWriter()
{
super(ess);
}
@Override
public File getFile() throws IOException
{
return getStorageFile();
}
@Override
public StorageObject getObject()
{
acquireReadLock();
return getData();
}
@Override
public void onFinish()
{
unlock();
finishWrite();
}
}
private class StorageObjectDataReader extends AbstractDelayedYamlFileReader<T>
{
public StorageObjectDataReader()
{
super(ess, clazz);
}
@Override
public File onStart() throws IOException
{
final File file = getStorageFile();
while (rwl.getReadHoldCount() > 0)
{
rwl.readLock().unlock();
}
rwl.writeLock().lock();
return file;
}
@Override
public void onSuccess(final T object)
{
if (object != null)
{
data = object;
}
rwl.writeLock().unlock();
loaded.set(true);
}
@Override
public void onException(final Exception exception)
{
if (data == null)
{
try
{
data = clazz.newInstance();
}
catch (Exception ex)
{
Bukkit.getLogger().log(Level.SEVERE, ex.getMessage(), ex);
}
}
rwl.writeLock().unlock();
loaded.set(true);
if (exception instanceof FileNotFoundException)
{
writer.schedule();
}
}
}
}
|
