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initial commit - new duplicate handling
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,83 @@ | ||
| package voldemort.store; | ||
|
|
||
| import java.util.ArrayList; | ||
| import java.util.List; | ||
|
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| import voldemort.VoldemortException; | ||
| import voldemort.utils.ByteUtils; | ||
| import voldemort.versioning.VectorClock; | ||
| import voldemort.versioning.Versioned; | ||
|
|
||
| /** | ||
| * Defines a generic on-disk data format for versioned voldemort data | ||
| * | ||
| * The format of the values stored on disk. The format is | ||
| * VERSION - 1 byte | ||
| * ------------repeating------------------- | ||
| * CLOCK - variable length, self delimiting | ||
| * NUM_CLOCK_ENTRIES - 2 bytes (short) | ||
| * VERSION_SIZE - 1 byte | ||
| * --------------- repeating ---------- | ||
| * NODE_ID - 2 bytes (short) | ||
| * VERSION - VERSION_SIZE bytes | ||
| * ------------------------------------ | ||
| * VALUE - variable length | ||
| * VALUE_SIZE - 4 bytes | ||
| * VALUE_BYTES - VALUE_SIZE bytes | ||
| * ---------------------------------------- | ||
| */ | ||
| public class StoreBinaryFormat { | ||
|
|
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| /* In the future we can use this to handle format changes */ | ||
| private static final byte VERSION = 0; | ||
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| public static byte[] toByteArray(List<Versioned<byte[]>> values) { | ||
| int size = 1; | ||
| for(Versioned<byte[]> v: values) { | ||
| size += ((VectorClock) v.getVersion()).sizeInBytes(); | ||
| size += 4; | ||
| size += v.getValue().length; | ||
| } | ||
| byte[] bytes = new byte[size]; | ||
| int pos = 1; | ||
| bytes[0] = VERSION; | ||
| for(Versioned<byte[]> v: values) { | ||
| //byte[] clock = ((VectorClock) v.getVersion()).toBytes(); | ||
| //System.arraycopy(clock, 0, bytes, pos, clock.length); | ||
| pos += ((VectorClock) v.getVersion()).toBytes(bytes,pos); | ||
| //pos += clock.length; | ||
| int len = v.getValue().length; | ||
| ByteUtils.writeInt(bytes, len, pos); | ||
| pos += ByteUtils.SIZE_OF_INT; | ||
| System.arraycopy(v.getValue(), 0, bytes, pos, len); | ||
| pos += len; | ||
| } | ||
| if(pos != bytes.length) | ||
| throw new VoldemortException((bytes.length - pos) | ||
| + " straggling bytes found in value (this should not be possible)!"); | ||
| return bytes; | ||
| } | ||
|
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| public static List<Versioned<byte[]>> fromByteArray(byte[] bytes) { | ||
| if(bytes.length < 1) | ||
| throw new VoldemortException("Invalid value length: " + bytes.length); | ||
| if(bytes[0] != VERSION) | ||
| throw new VoldemortException("Unexpected version number in value: " + bytes[0]); | ||
| int pos = 1; | ||
| List<Versioned<byte[]>> vals = new ArrayList<Versioned<byte[]>>(2); | ||
| while(pos < bytes.length) { | ||
| VectorClock clock = new VectorClock(bytes, pos); | ||
| pos += clock.sizeInBytes(); | ||
| int valueSize = ByteUtils.readInt(bytes, pos); | ||
| pos += ByteUtils.SIZE_OF_INT; | ||
| byte[] val = new byte[valueSize]; | ||
| System.arraycopy(bytes, pos, val, 0, valueSize); | ||
| pos += valueSize; | ||
| vals.add(Versioned.value(val, clock)); | ||
| } | ||
| if(pos != bytes.length) | ||
| throw new VoldemortException((bytes.length - pos) | ||
| + " straggling bytes found in value (this should not be possible)!"); | ||
| return vals; | ||
| } | ||
| } |
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