forked from voldemort/voldemort
/
CompressingStore.java
181 lines (156 loc) · 6.78 KB
/
CompressingStore.java
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
/*
* Copyright 2008-2009 LinkedIn, 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.
*/
package voldemort.store.compress;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import voldemort.VoldemortException;
import voldemort.store.Store;
import voldemort.store.StoreCapabilityType;
import voldemort.store.StoreUtils;
import voldemort.utils.ByteArray;
import voldemort.utils.Utils;
import voldemort.versioning.Version;
import voldemort.versioning.Versioned;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
/**
* A Store Decorator that compresses keys and values as it stores them and
* uncompresses them as it reads them based on the CompressionStrategy objects
* provided. A {@link NoopCompressionStrategy} can be used if no compression is
* desired for either keys or values.
*
* Transforms are not compressed
*
* @see CompressionStrategy
* @see NoopCompressionStrategy
* @see GzipCompressionStrategy
*/
public class CompressingStore implements Store<ByteArray, byte[], byte[]> {
private final Store<ByteArray, byte[], byte[]> innerStore;
private final CompressionStrategy keysCompressionStrategy;
private final CompressionStrategy valuesCompressionStrategy;
public CompressingStore(Store<ByteArray, byte[], byte[]> innerStore,
CompressionStrategy keysCompressionStrategy,
CompressionStrategy valuesCompressionStrategy) {
this.keysCompressionStrategy = Utils.notNull(keysCompressionStrategy);
this.valuesCompressionStrategy = Utils.notNull(valuesCompressionStrategy);
this.innerStore = Utils.notNull(innerStore);
}
private List<ByteArray> deflateKeys(Iterable<ByteArray> keys) {
List<ByteArray> deflatedKeys = Lists.newArrayList();
for(ByteArray key: keys)
deflatedKeys.add(deflateKey(key));
return deflatedKeys;
}
public Map<ByteArray, List<Versioned<byte[]>>> getAll(Iterable<ByteArray> keys,
Map<ByteArray, byte[]> transforms)
throws VoldemortException {
StoreUtils.assertValidKeys(keys);
Iterable<ByteArray> processedKeys = keys;
processedKeys = deflateKeys(keys);
Map<ByteArray, byte[]> newTransforms = Maps.newHashMap();
if(transforms != null) {
for(Map.Entry<ByteArray, byte[]> transform: transforms.entrySet()) {
newTransforms.put(deflateKey(transform.getKey()), transform.getValue());
}
} else {
for(ByteArray deflatedKey: processedKeys) {
newTransforms.put(deflatedKey, null);
}
}
Map<ByteArray, List<Versioned<byte[]>>> deflatedResult = innerStore.getAll(processedKeys,
newTransforms);
Map<ByteArray, List<Versioned<byte[]>>> result = Maps.newHashMapWithExpectedSize(deflatedResult.size());
for(Map.Entry<ByteArray, List<Versioned<byte[]>>> mapEntry: deflatedResult.entrySet())
result.put(inflateKey(mapEntry.getKey()), inflateValues(mapEntry.getValue()));
return result;
}
private ByteArray inflateKey(ByteArray key) {
byte[] inflated = inflate(keysCompressionStrategy, key.get());
/* This usually means that keys are not compressed */
if(inflated == key.get())
return key;
return new ByteArray(inflated);
}
private ByteArray deflateKey(ByteArray key) {
byte[] deflated = deflate(keysCompressionStrategy, key.get());
/* This usually means that keys are not compressed */
if(deflated == key.get())
return key;
return new ByteArray(deflated);
}
private Versioned<byte[]> deflateValue(Versioned<byte[]> versioned) {
return new Versioned<byte[]>(deflate(valuesCompressionStrategy, versioned.getValue()),
versioned.getVersion());
}
private Versioned<byte[]> inflateValue(Versioned<byte[]> versioned) {
return new Versioned<byte[]>(inflate(valuesCompressionStrategy, versioned.getValue()),
versioned.getVersion());
}
private byte[] inflate(CompressionStrategy compressionStrategy, byte[] data)
throws VoldemortException {
try {
return compressionStrategy.inflate(data);
} catch(IOException e) {
throw new VoldemortException(e);
}
}
private byte[] deflate(CompressionStrategy compressionStrategy, byte[] data)
throws VoldemortException {
try {
return compressionStrategy.deflate(data);
} catch(IOException e) {
throw new VoldemortException(e);
}
}
public List<Versioned<byte[]>> get(ByteArray key, byte[] transforms) throws VoldemortException {
StoreUtils.assertValidKey(key);
return inflateValues(innerStore.get(deflateKey(key), transforms));
}
public List<Version> getVersions(ByteArray key) {
return innerStore.getVersions(deflateKey(key));
}
private List<Versioned<byte[]>> inflateValues(List<Versioned<byte[]>> result) {
List<Versioned<byte[]>> inflated = new ArrayList<Versioned<byte[]>>(result.size());
for(Versioned<byte[]> item: result)
inflated.add(inflateValue(item));
return inflated;
}
public void put(ByteArray key, Versioned<byte[]> value, byte[] transforms)
throws VoldemortException {
StoreUtils.assertValidKey(key);
innerStore.put(deflateKey(key), deflateValue(value), transforms);
}
public void close() throws VoldemortException {
innerStore.close();
}
public Object getCapability(StoreCapabilityType capability) {
return innerStore.getCapability(capability);
}
public String getName() {
return innerStore.getName();
}
public boolean delete(ByteArray key, Version version) throws VoldemortException {
StoreUtils.assertValidKey(key);
return innerStore.delete(deflateKey(key), version);
}
public Map<ByteArray, Boolean> hasKeys(Iterable<ByteArray> keys) {
StoreUtils.assertValidKeys(keys);
return innerStore.hasKeys(deflateKeys(keys));
}
}