tyler.durden/snappy-java
1
0
Fork 0
mirror of https://github.com/xerial/snappy-java.git synced 2025-07-20 12:34:30 +02:00
Code Issues Packages Projects Releases Wiki Activity

Add comments

Browse Source
This commit is contained in:
Taro L. Saito 2011-08-01 15:47:02 +09:00
parent 199b12e61c
commit ecd8aaa3e9
2 changed files with 17 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
src/main/java/org/xerial/snappy/SnappyLoader.java
View File

@ -114,8 +114,8 @@ public class SnappyLoader
/**
* Load SnappyNative and its JNI native implementation in the root class
* loader. This is necessary to avoid JNI multi-loading issues when the same
* JNI library is loaded by different class loaders in the same JVM.
* loader. This is necessary to avoid the JNI multi-loading issue when the
* same JNI library is loaded by different class loaders in the same JVM.
*
* In order to load native code in the root class loader, this method first
* inject SnappyNativeLoader class into the root class loader, because
@ -123,14 +123,26 @@ public class SnappyLoader
* class when loading native libraries.
*
* <pre>
* (root class loader) -> [SnappyNativeLoader, SnappyNative, SnappyNativeAPI, SnappyErrorCode] (injected by this method)
* (root class loader) -> [SnappyNativeLoader (load JNI code), SnappyNative (has native methods), SnappyNativeAPI, SnappyErrorCode] (injected by this method)
* |
* |
* (child class loader) -> See the above classes loaded by the root class loader.
* (child class loader) -> Sees the above classes loaded by the root class loader.
* Then creates SnappyNativeAPI implementation by instantiating SnappyNaitive class.
* </pre>
*
*
* <pre>
* (root class loader) -> [SnappyNativeLoader, SnappyNative ...] -> native code is loaded by once in this class loader
* | \
* | (child2 class loader)
* (child1 class loader)
*
* child1 and child2 share the same SnappyNative code loaded by the root class loader.
* </pre>
*
* Note that Java's class loader first delegates the class lookup to its
* parent class loader. So once SnappyNativeLoader is loaded by the root
* class loader, no child class loader initialize SnappyNativeLoader again.
*
* @return
*/

2
src/main/java/org/xerial/snappy/SnappyNative.java
View File

@ -32,7 +32,7 @@ import java.nio.ByteBuffer;
* method in this class is defined in SnappyNative.h (genereted by javah) and
* SnappyNative.cpp
*
* NEVER USE THIS CLASS DIRECTROY since it breaks the native library code
* NEVER USE THIS CLASS DIRECTLY since it breaks the native library code
* loading.
*
* @author leo