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java.lang.Object org.sonar.duplications.index.AbstractCloneIndex org.sonar.duplications.index.PackedMemoryCloneIndex
public class PackedMemoryCloneIndex
Provides an index optimized by memory.
Each object in Java has an overhead - see
"HOWTO: Determine the size of a Java Object or Class".
So to optimize memory consumption, we use flat arrays, however this increases time of queries.
During usual detection of duplicates most time consuming method is a getByResourceId(String)
:
around 50% of time spent in this class and number of invocations of this method is 1% of total invocations,
however total time spent in this class less than 1 second for small projects and around 2 seconds for projects like JDK.
Note that this implementation currently does not support deletion, however it's possible to implement.
Constructor Summary | |
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PackedMemoryCloneIndex()
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PackedMemoryCloneIndex(int hashBytes,
int initialCapacity)
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Method Summary | |
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Collection<Block> |
getByResourceId(String resourceId)
Performs search of blocks for specified resource. |
Collection<Block> |
getBySequenceHash(ByteArray sequenceHash)
Performs search of blocks for specified hash value. |
void |
insert(Block block)
Adds specified block into index. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public PackedMemoryCloneIndex()
public PackedMemoryCloneIndex(int hashBytes, int initialCapacity)
hashBytes
- size of hash in bytesinitialCapacity
- the initial capacityMethod Detail |
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public Collection<Block> getByResourceId(String resourceId)
Note that this implementation does not guarantee that blocks would be sorted by index.
public Collection<Block> getBySequenceHash(ByteArray sequenceHash)
public void insert(Block block)
Note that this implementation allows insertion of two blocks with same index for one resource.
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