Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 1 | package org.onlab.onos.store.service; |
| 2 | |
| 3 | import static com.google.common.base.Preconditions.checkArgument; |
| 4 | |
| 5 | import java.util.Objects; |
| 6 | |
Yuta HIGUCHI | 5e1cfe0 | 2014-11-04 21:22:45 -0800 | [diff] [blame] | 7 | import com.google.common.base.MoreObjects; |
| 8 | |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 9 | /** |
| 10 | * Database write request. |
| 11 | */ |
| 12 | public class WriteRequest { |
| 13 | |
| 14 | private final String tableName; |
| 15 | private final String key; |
| 16 | private final byte[] newValue; |
| 17 | private final long previousVersion; |
| 18 | private final byte[] oldValue; |
| 19 | |
Yuta HIGUCHI | 47eb0d4 | 2014-11-05 14:31:20 -0800 | [diff] [blame^] | 20 | /** |
| 21 | * Creates a write request, which will |
| 22 | * put the specified value to the table regardless of the previous value. |
| 23 | * |
| 24 | * @param tableName name of the table |
| 25 | * @param key key in the table |
| 26 | * @param newValue value to write |
| 27 | * @return WriteRequest |
| 28 | */ |
| 29 | public static WriteRequest put(String tableName, String key, |
| 30 | byte[] newValue) { |
| 31 | return new WriteRequest(tableName, key, newValue, -1, null); |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 32 | } |
| 33 | |
Yuta HIGUCHI | 47eb0d4 | 2014-11-05 14:31:20 -0800 | [diff] [blame^] | 34 | // FIXME: Is there a special version value to realize putIfAbsent? |
| 35 | /** |
| 36 | * Creates a write request, which will |
| 37 | * put the specified value to the table if the previous version matches. |
| 38 | * |
| 39 | * @param tableName name of the table |
| 40 | * @param key key in the table |
| 41 | * @param newValue value to write |
| 42 | * @param previousVersion previous version expected |
| 43 | * @return WriteRequest |
| 44 | */ |
| 45 | public static WriteRequest putIfVersionMatches(String tableName, String key, |
| 46 | byte[] newValue, |
| 47 | long previousVersion) { |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 48 | checkArgument(previousVersion >= 0); |
Yuta HIGUCHI | 47eb0d4 | 2014-11-05 14:31:20 -0800 | [diff] [blame^] | 49 | return new WriteRequest(tableName, key, newValue, previousVersion, null); |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 50 | } |
| 51 | |
Yuta HIGUCHI | 47eb0d4 | 2014-11-05 14:31:20 -0800 | [diff] [blame^] | 52 | // FIXME: What is the behavior of oldValue=null? putIfAbsent? |
| 53 | /** |
| 54 | * Creates a write request, which will |
| 55 | * put the specified value to the table if the previous value matches. |
| 56 | * |
| 57 | * @param tableName name of the table |
| 58 | * @param key key in the table |
| 59 | * @param newValue value to write |
| 60 | * @param oldValue previous value expected |
| 61 | * @return WriteRequest |
| 62 | */ |
| 63 | public static WriteRequest putIfValueMatches(String tableName, String key, |
| 64 | byte[] newValue, |
| 65 | byte[] oldValue) { |
| 66 | return new WriteRequest(tableName, key, newValue, -1, oldValue); |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 67 | } |
| 68 | |
Yuta HIGUCHI | 47eb0d4 | 2014-11-05 14:31:20 -0800 | [diff] [blame^] | 69 | // FIXME: How do we remove value? newValue=null? |
| 70 | |
Yuta HIGUCHI | 3a3ac96 | 2014-11-04 18:05:08 -0800 | [diff] [blame] | 71 | // hidden constructor |
Yuta HIGUCHI | 47eb0d4 | 2014-11-05 14:31:20 -0800 | [diff] [blame^] | 72 | protected WriteRequest(String tableName, String key, byte[] newValue, long previousVersion, byte[] oldValue) { |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 73 | |
| 74 | checkArgument(tableName != null); |
| 75 | checkArgument(key != null); |
| 76 | checkArgument(newValue != null); |
| 77 | |
| 78 | this.tableName = tableName; |
| 79 | this.key = key; |
| 80 | this.newValue = newValue; |
| 81 | this.previousVersion = previousVersion; |
| 82 | this.oldValue = oldValue; |
| 83 | } |
| 84 | |
| 85 | public String tableName() { |
| 86 | return tableName; |
| 87 | } |
| 88 | |
| 89 | public String key() { |
| 90 | return key; |
| 91 | } |
| 92 | |
| 93 | public byte[] newValue() { |
| 94 | return newValue; |
| 95 | } |
| 96 | |
| 97 | public long previousVersion() { |
| 98 | return previousVersion; |
| 99 | } |
| 100 | |
| 101 | public byte[] oldValue() { |
| 102 | return oldValue; |
| 103 | } |
| 104 | |
| 105 | @Override |
| 106 | public String toString() { |
Yuta HIGUCHI | 5e1cfe0 | 2014-11-04 21:22:45 -0800 | [diff] [blame] | 107 | return MoreObjects.toStringHelper(getClass()) |
| 108 | .add("tableName", tableName) |
| 109 | .add("key", key) |
| 110 | .add("newValue", newValue) |
| 111 | .add("previousVersion", previousVersion) |
| 112 | .add("oldValue", oldValue) |
| 113 | .toString(); |
Madan Jampani | 08822c4 | 2014-11-04 17:17:46 -0800 | [diff] [blame] | 114 | } |
| 115 | |
| 116 | @Override |
| 117 | public int hashCode() { |
| 118 | return Objects.hash(key, tableName, previousVersion); |
| 119 | } |
| 120 | |
| 121 | @Override |
| 122 | public boolean equals(Object obj) { |
| 123 | if (this == obj) { |
| 124 | return true; |
| 125 | } |
| 126 | if (obj == null) { |
| 127 | return false; |
| 128 | } |
| 129 | if (getClass() != obj.getClass()) { |
| 130 | return false; |
| 131 | } |
| 132 | WriteRequest other = (WriteRequest) obj; |
| 133 | return Objects.equals(this.key, other.key) && |
| 134 | Objects.equals(this.tableName, other.tableName) && |
| 135 | Objects.equals(this.previousVersion, other.previousVersion); |
| 136 | } |
| 137 | } |