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Fixes #326 Add option to disable fallback to PureJavaSnappy + doc #333

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lehnerj wants to merge 1 commit into from
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Fixes #326 Add option to disable fallback to PureJavaSnappy + doc #333

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2 changes: 1 addition & 1 deletion README.md
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Expand Up @@ -172,7 +172,7 @@ A file `target/snappy-java-$(version).jar` is the product additionally containin
### Using pure-java Snappy implementation

snappy-java can optionally use a pure-java implementation of Snappy based on [aircompressor](https://github.com/airlift/aircompressor/tree/master/src/main/java/io/airlift/compress/snappy). This implementation is selected when no native Snappy library for your platform is found. You can also force using this pure-java implementation by setting a JVM property `org.xerial.snappy.purejava=true` before loading any class of Snappy (e.g., using `-Dorg.xerial.snappy.purejava=true` option when launching JVM).

The pure-java implementation is also used as a fallback when no native Snappy library can be loaded. You can disable this fallback by setting the JVM property `org.xerial.snappy.purejava.fallback=false`

### Using snappy-java with Tomcat 6 (or higher) Web Server

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7 changes: 6 additions & 1 deletion src/main/java/org/xerial/snappy/SnappyLoader.java
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Expand Up @@ -78,6 +78,7 @@ public class SnappyLoader
public static final String KEY_SNAPPY_LIB_PATH = "org.xerial.snappy.lib.path";
public static final String KEY_SNAPPY_LIB_NAME = "org.xerial.snappy.lib.name";
public static final String KEY_SNAPPY_PUREJAVA = "org.xerial.snappy.purejava";
public static final String KEY_SNAPPY_PUREJAVA_FALLBACK = "org.xerial.snappy.purejava.fallback";
public static final String KEY_SNAPPY_TEMPDIR = "org.xerial.snappy.tempdir";
public static final String KEY_SNAPPY_USE_SYSTEMLIB = "org.xerial.snappy.use.systemlib";
public static final String KEY_SNAPPY_DISABLE_BUNDLED_LIBS = "org.xerial.snappy.disable.bundled.libs"; // Depreciated, but preserved for backward compatibility
Expand Down Expand Up @@ -170,7 +171,11 @@ static synchronized SnappyApi loadSnappyApi()
}
catch(Throwable e) {
// Fall-back to pure-java Snappy implementation
setSnappyApi(new PureJavaSnappy());
if(Boolean.parseBoolean(System.getProperty(KEY_SNAPPY_PUREJAVA_FALLBACK, "true"))) {
setSnappyApi(new PureJavaSnappy());
} else {
throw e;
}
}
return snappyApi;
}
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