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ql/src/java/org/apache/hadoop/hive/ql/metadata/HiveMetaStoreClientFactory.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,84 @@ | ||
| package org.apache.hadoop.hive.ql.metadata; | ||
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| import static com.google.common.base.Preconditions.checkNotNull; | ||
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| import java.lang.reflect.Constructor; | ||
| import java.lang.reflect.InvocationHandler; | ||
| import java.lang.reflect.Proxy; | ||
| import java.util.concurrent.ConcurrentHashMap; | ||
| import org.apache.commons.lang.exception.ExceptionUtils; | ||
| import org.apache.hadoop.conf.Configuration; | ||
| import org.apache.hadoop.hive.conf.HiveConf; | ||
| import org.apache.hadoop.hive.conf.HiveConf.ConfVars; | ||
| import org.apache.hadoop.hive.metastore.ExceptionHandler; | ||
| import org.apache.hadoop.hive.metastore.HiveMetaHookLoader; | ||
| import org.apache.hadoop.hive.metastore.IMetaStoreClient; | ||
| import org.apache.hadoop.hive.metastore.api.MetaException; | ||
| import org.apache.hadoop.hive.metastore.conf.MetastoreConf; | ||
| import org.apache.hadoop.hive.metastore.utils.JavaUtils; | ||
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| public class HiveMetaStoreClientFactory { | ||
| public static IMetaStoreClient createMetaStoreClient(HiveConf conf, HiveMetaHookLoader hookLoader, | ||
| boolean allowEmbedded, ConcurrentHashMap<String, Long> metaCallTimeMap) throws MetaException { | ||
| checkNotNull(conf, "conf cannot be null!"); | ||
| checkNotNull(hookLoader, "hookLoader cannot be null!"); | ||
| checkNotNull(metaCallTimeMap, "metaCallTimeMap cannot be null!"); | ||
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| String clientClassName = MetastoreConf.getVar(conf, MetastoreConf.ConfVars.METASTORE_CLIENT_CLASS); | ||
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| if (clientClassName.equals(SessionHiveMetaStoreClient.class.getName()) | ||
| && conf.getBoolVar(ConfVars.METASTORE_FASTPATH)) { | ||
| // METASTORE_FASTPATH is a parameter only for SessionHiveMetaStoreClient | ||
| return new SessionHiveMetaStoreClient(conf, hookLoader, allowEmbedded); | ||
| } | ||
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| String proxyClassName = MetastoreConf.getVar(conf, MetastoreConf.ConfVars.METASTORE_CLIENT_PROXY_CLASS); | ||
| if (proxyClassName == null) { | ||
| // Without a proxy | ||
| Class<? extends IMetaStoreClient> baseClass = JavaUtils.getClass(clientClassName, IMetaStoreClient.class); | ||
| return JavaUtils.newInstance( | ||
| baseClass, | ||
| new Class[] { Configuration.class, HiveMetaHookLoader.class, Boolean.class }, | ||
| new Object[] { conf, hookLoader, allowEmbedded }); | ||
| } | ||
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| return getProxy(conf, hookLoader, metaCallTimeMap, clientClassName, allowEmbedded, proxyClassName); | ||
| } | ||
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| private static IMetaStoreClient getProxy(Configuration hiveConf, HiveMetaHookLoader hookLoader, | ||
| ConcurrentHashMap<String, Long> metaCallTimeMap, String mscClassName, boolean allowEmbedded, | ||
| String proxyClassName) throws MetaException { | ||
| return getProxy(hiveConf, | ||
| new Class[] {Configuration.class, HiveMetaHookLoader.class, Boolean.class}, | ||
| new Object[] {hiveConf, hookLoader, allowEmbedded}, | ||
| metaCallTimeMap, | ||
| mscClassName, | ||
| proxyClassName | ||
| ); | ||
| } | ||
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| private static IMetaStoreClient getProxy(Configuration hiveConf, Class<?>[] constructorArgTypes, | ||
| Object[] constructorArgs, ConcurrentHashMap<String, Long> metaCallTimeMap, | ||
| String mscClassName, String proxyClassName) throws MetaException { | ||
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| @SuppressWarnings("unchecked") | ||
| Class<? extends IMetaStoreClient> baseClass = | ||
| JavaUtils.getClass(mscClassName, IMetaStoreClient.class); | ||
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| Class<? extends InvocationHandler> proxy = JavaUtils.getClass(proxyClassName, InvocationHandler.class); | ||
| try { | ||
| InvocationHandler handler = JavaUtils.newInstance( | ||
| proxy, | ||
| new Class[] { Configuration.class, Class[].class, Object[].class, ConcurrentHashMap.class, Class.class }, | ||
| new Object[] { hiveConf, constructorArgTypes, constructorArgs, metaCallTimeMap, baseClass } | ||
| ); | ||
| return (IMetaStoreClient) Proxy.newProxyInstance(proxy.getClassLoader(), baseClass.getInterfaces(), handler); | ||
| } catch (Throwable t) { | ||
| Throwable rootCause = ExceptionUtils.getRootCause(t); | ||
| if (rootCause instanceof Exception) { | ||
| throw ExceptionHandler.newMetaException((Exception) rootCause); | ||
| } | ||
| throw t; | ||
| } | ||
| } | ||
| } |
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