hadoop ErasureCodeNative 源码
haddop ErasureCodeNative 代码
文件路径：/hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/io/erasurecode/ErasureCodeNative.java
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hadoop.io.erasurecode;
import org.apache.hadoop.util.NativeCodeLoader;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Erasure code native libraries (for now, Intel ISA-L) related utilities.
*/
public final class ErasureCodeNative {
private static final Logger LOG =
LoggerFactory.getLogger(ErasureCodeNative.class.getName());
/**
* The reason why ISA-L library is not available, or null if it is available.
*/
private static final String LOADING_FAILURE_REASON;
static {
if (!NativeCodeLoader.isNativeCodeLoaded()) {
LOADING_FAILURE_REASON = "hadoop native library cannot be loaded.";
} else if (!NativeCodeLoader.buildSupportsIsal()) {
LOADING_FAILURE_REASON = "libhadoop was built without ISA-L support";
} else {
String problem = null;
try {
loadLibrary();
} catch (Throwable t) {
problem = "Loading ISA-L failed: " + t.getMessage();
LOG.warn(problem);
}
LOADING_FAILURE_REASON = problem;
}
if (LOADING_FAILURE_REASON != null) {
LOG.warn("ISA-L support is not available in your platform... " +
"using builtin-java codec where applicable");
}
}
private ErasureCodeNative() {}
/**
* Are native libraries loaded?
* @return if is native code loaded true,not false.
*/
public static boolean isNativeCodeLoaded() {
return LOADING_FAILURE_REASON == null;
}
/**
* Is the native ISA-L library loaded and initialized? Throw exception if not.
*/
public static void checkNativeCodeLoaded() {
if (LOADING_FAILURE_REASON != null) {
throw new RuntimeException(LOADING_FAILURE_REASON);
}
}
/**
* Load native library available or supported.
*/
public static native void loadLibrary();
/**
* Get the native library name that's available or supported.
* @return library name.
*/
public static native String getLibraryName();
public static String getLoadingFailureReason() {
return LOADING_FAILURE_REASON;
}
}
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