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93 changes: 93 additions & 0 deletions
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core/src/main/java/com/scalar/db/util/groupcommit/DefaultGroupCommitKeyManipulator.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,93 @@ | ||
| package com.scalar.db.util.groupcommit; | ||
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| import java.util.concurrent.ThreadLocalRandom; | ||
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| public class DefaultGroupCommitKeyManipulator | ||
| implements GroupCommitKeyManipulator<String, String, String, String, String> { | ||
| private static final int PRIMARY_KEY_SIZE = 24; | ||
| private static final char DELIMITER = '$'; | ||
| private static final int MAX_FULL_KEY_SIZE = 64; | ||
| private static final int MAX_CHILD_KEY_SIZE = | ||
| MAX_FULL_KEY_SIZE - PRIMARY_KEY_SIZE - 1 /* delimiter */; | ||
| private static final char[] CHARS_FOR_PRIMARY_KEY; | ||
| private static final int CHARS_FOR_PRIMARY_KEY_SIZE; | ||
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|
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| static { | ||
| int digitsLen = '9' - '0' + 1; | ||
| int upperCasesLen = 'Z' - 'A' + 1; | ||
| int lowerCasesLen = 'z' - 'a' + 1; | ||
| CHARS_FOR_PRIMARY_KEY = new char[digitsLen + upperCasesLen + lowerCasesLen]; | ||
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|
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| int index = 0; | ||
| for (char c = '0'; c <= '9'; c++) { | ||
| CHARS_FOR_PRIMARY_KEY[index++] = c; | ||
| } | ||
| for (char c = 'A'; c <= 'Z'; c++) { | ||
| CHARS_FOR_PRIMARY_KEY[index++] = c; | ||
| } | ||
| for (char c = 'a'; c <= 'z'; c++) { | ||
| CHARS_FOR_PRIMARY_KEY[index++] = c; | ||
| } | ||
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| CHARS_FOR_PRIMARY_KEY_SIZE = CHARS_FOR_PRIMARY_KEY.length; | ||
| } | ||
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| @Override | ||
| public String generateParentKey() { | ||
| char[] chars = new char[PRIMARY_KEY_SIZE]; | ||
| for (int i = 0; i < PRIMARY_KEY_SIZE; i++) { | ||
| chars[i] = | ||
| CHARS_FOR_PRIMARY_KEY[ThreadLocalRandom.current().nextInt(CHARS_FOR_PRIMARY_KEY_SIZE)]; | ||
| } | ||
| return new String(chars); | ||
| } | ||
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| @Override | ||
| public String fullKey(String parentKey, String childKey) { | ||
| if (parentKey.length() != PRIMARY_KEY_SIZE) { | ||
| throw new IllegalArgumentException( | ||
| String.format( | ||
| "The length of parent key must be %d. ParentKey: %s", PRIMARY_KEY_SIZE, childKey)); | ||
| } | ||
| if (childKey.length() > MAX_CHILD_KEY_SIZE) { | ||
| throw new IllegalArgumentException( | ||
| String.format( | ||
| "The length of child key must not exceed %d. ChildKey: %s", | ||
| MAX_CHILD_KEY_SIZE, childKey)); | ||
| } | ||
| return parentKey + DELIMITER + childKey; | ||
| } | ||
|
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| @Override | ||
| public boolean isFullKey(Object obj) { | ||
| if (!(obj instanceof String)) { | ||
| return false; | ||
| } | ||
| String key = (String) obj; | ||
| return key.length() > PRIMARY_KEY_SIZE && key.charAt(PRIMARY_KEY_SIZE) == DELIMITER; | ||
| } | ||
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| @Override | ||
| public Keys<String, String, String> keysFromFullKey(String fullKey) { | ||
| if (!isFullKey(fullKey)) { | ||
| throw new IllegalArgumentException("Invalid full key. Key:" + fullKey); | ||
| } | ||
|
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| return new Keys<>( | ||
| fullKey.substring(0, PRIMARY_KEY_SIZE), | ||
| fullKey.substring(PRIMARY_KEY_SIZE + 1 /* delimiter */), | ||
| fullKey); | ||
| } | ||
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| @Override | ||
| public String emitFullKeyFromFullKey(String fullKey) { | ||
| // Return the string as is since the value is already String. | ||
| return fullKey; | ||
| } | ||
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| @Override | ||
| public String emitParentKeyFromParentKey(String parentKey) { | ||
| // Return the string as is since the value is already String. | ||
| return parentKey; | ||
| } | ||
| } |
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