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SQL: add comments on JDBC thread-safety (or rather lack of) 

Original commit: elastic/x-pack-elasticsearch@6ea5adc6a8
This commit is contained in:
Costin Leau 2018-02-02 18:09:22 +02:00
parent 2c66b058f3
commit 34fe0beb30
4 changed files with 17 additions and 40 deletions
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4
plugin/sql/jdbc/src/main/java/org/elasticsearch/xpack/sql/jdbc/net/client/JdbcHttpClient.java
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@ -23,6 +23,10 @@ import java.util.stream.Collectors;
import static org.elasticsearch.xpack.sql.client.shared.StringUtils.EMPTY;
/**
* JDBC specific HTTP client.
* Since JDBC is not thread-safe, neither is this class.
*/
public class JdbcHttpClient {
private final HttpClient httpClient;
private final JdbcConfiguration conCfg;

4
plugin/sql/sql-shared-client/src/main/java/org/elasticsearch/xpack/sql/client/HttpClient.java
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@ -38,7 +38,9 @@ import java.sql.SQLException;
import java.util.function.Function;
/**
* A specialized high-level REST client with support for SQL-related functions
* A specialized high-level REST client with support for SQL-related functions.
* Similar to JDBC and the underlying HTTP connection, this class is not thread-safe
* and follows a request-response flow.
*/
public class HttpClient {

12
plugin/sql/sql-shared-client/src/main/java/org/elasticsearch/xpack/sql/client/shared/JreHttpUrlConnection.java
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@ -5,9 +5,6 @@
*/
package org.elasticsearch.xpack.sql.client.shared;
import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLSocketFactory;
import javax.sql.rowset.serial.SerialException;
import java.io.BufferedInputStream;
import java.io.Closeable;
import java.io.IOException;
@ -33,8 +30,17 @@ import java.util.Base64;
import java.util.function.Function;
import java.util.zip.GZIPInputStream;
import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLSocketFactory;
import javax.sql.rowset.serial.SerialException;
import static java.util.Collections.emptyMap;
/**
* Low-level http client using the built-in {@link HttpURLConnection}.
* As such, it has a stateless, on-demand, request-response flow without
* any connection pooling or sharing.
*/
public class JreHttpUrlConnection implements Closeable {
/**
* State added to {@link SQLException}s when the server encounters an

35
plugin/sql/src/main/java/org/elasticsearch/xpack/sql/util/ReflectionUtils.java
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@ -7,47 +7,12 @@ package org.elasticsearch.xpack.sql.util;
import org.elasticsearch.xpack.sql.SqlIllegalArgumentException;
import java.lang.reflect.GenericArrayType;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.lang.reflect.WildcardType;
import java.util.Arrays;
public class ReflectionUtils {
@SuppressWarnings("unchecked")
public static <E> Class<E> detectType(Type t) {
if (t instanceof Class<?>) {
return (Class<E>) t;
}
if (t instanceof ParameterizedType) {
Type[] typeArguments = ((ParameterizedType) t).getActualTypeArguments();
if (typeArguments.length != 1) {
throw new SqlIllegalArgumentException("Unexpected number of type arguments {} for {}", Arrays.toString(typeArguments), t);
}
return detectType(typeArguments[0]);
}
if (t instanceof WildcardType) {
WildcardType wt = (WildcardType) t;
if (wt.getLowerBounds().length == 1) {
return detectType(wt.getLowerBounds()[0]);
}
Type[] upperBounds = wt.getUpperBounds();
if (upperBounds.length != 1) {
throw new SqlIllegalArgumentException("Unexpected number of upper bounds {} for {}", Arrays.toString(upperBounds), t);
}
return detectType(upperBounds[0]);
}
if (t instanceof GenericArrayType) {
return detectType(((GenericArrayType) t).getGenericComponentType());
}
throw new SqlIllegalArgumentException("Unrecognized type {}", t);
}
@SuppressWarnings("unchecked")
public static <E> Class<E> detectSuperTypeForRuleLike(Class<?> c) {
Class<?> clazz = c;