Changeset: 784259e85d8f for MonetDB
URL: http://dev.monetdb.org/hg/MonetDB?cmd=changeset;node=784259e85d8f
Modified Files:
java/embedded/org_monetdb_embedded_MonetDBEmbedded.c
java/embedded/src/main/java/org/monetdb/embedded/MonetDBEmbedded.java
java/embedded/src/main/java/org/monetdb/embedded/result/EmbeddedQueryResult.java
java/embedded/src/test/java/org/monetdb/embedded/test/EmbeddedTest.java
Branch: embedded-java
Log Message:
Ensuring only one instance can be instantiated from the same JVM
- If another one in the same dir is attempted to be started the method siply
returns true.
- If one is attempted to be started in a different dir, it throws an exception.
diffs (228 lines):
diff --git a/java/embedded/org_monetdb_embedded_MonetDBEmbedded.c
b/java/embedded/org_monetdb_embedded_MonetDBEmbedded.c
--- a/java/embedded/org_monetdb_embedded_MonetDBEmbedded.c
+++ b/java/embedded/org_monetdb_embedded_MonetDBEmbedded.c
@@ -13,6 +13,9 @@
#include "res_table.h"
#include "mal_type.h"
+bool running = false;
+char *runningDirectory;
+
JNIEXPORT jboolean JNICALL
Java_org_monetdb_embedded_MonetDBEmbedded_startupWrapper
(JNIEnv *env, jobject object, jstring directory, jboolean silent) {
(void)object;
@@ -20,9 +23,25 @@ JNIEXPORT jboolean JNICALL Java_org_mone
char *directory_string = strdup(directory_string_tmp);
unsigned char silent_char = 'n';
char *err;
-
+ jclass exClass = (*env)->FindClass(env, "java/io/IOException");
// Release the directory string
(*env)->ReleaseStringUTFChars(env, directory, directory_string_tmp);
+
+ // Check if we already have a running db
+ if (running) {
+ if (strcmp(directory_string, runningDirectory) == 0) {
+ return true;
+ }
+ // Throw a Java exception
+ if (exClass == NULL) {
+ // Cloud not find the exception class, just return
empty object
+ return false;
+ }
+ err = "A database is already working in another directory. Only
a single embedded MonetDB process can be started in the same JVM";
+ (*env)->ThrowNew(env, exClass, err);
+ return false;
+ }
+
// Set the silent flag based on passed boolean value
if (silent) {
silent_char = 'y';
@@ -31,9 +50,6 @@ JNIEXPORT jboolean JNICALL Java_org_mone
err = monetdb_startup(directory_string, silent_char);
// Checking for errors
if (err != NULL) {
- jclass exClass = (*env)->FindClass(env, "java/io/IOException");
-
- // Clean up the result data
if (exClass == NULL) {
// Cloud not find the exception class, just return
empty object
return false;
@@ -42,6 +58,9 @@ JNIEXPORT jboolean JNICALL Java_org_mone
return false;
}
+ // set the flags
+ running = true;
+ runningDirectory = directory_string;
return true;
}
diff --git
a/java/embedded/src/main/java/org/monetdb/embedded/MonetDBEmbedded.java
b/java/embedded/src/main/java/org/monetdb/embedded/MonetDBEmbedded.java
--- a/java/embedded/src/main/java/org/monetdb/embedded/MonetDBEmbedded.java
+++ b/java/embedded/src/main/java/org/monetdb/embedded/MonetDBEmbedded.java
@@ -18,6 +18,7 @@ import org.monetdb.embedded.result.Embed
* Embedded version of MonetDB.
* Communication between Java and native C is done via JNI.
*
+ * <br/><strong>Note</strong>: You can have only one embedded MonetDB database
running per JVM process.
*/
public class MonetDBEmbedded {
/**
@@ -27,24 +28,31 @@ public class MonetDBEmbedded {
/**
* The working directory for MonetDB.
*/
- private File directory;
- private boolean silentFlag;
+ private final File databaseDirectory;
+ /**
+ * Silent flag for database startup
+ */
+ private final boolean silentFlag;
/**
- * You can instantiate multiple object,
- * just make sure they are assigned different directories.
- *
- * @param directory Database directory
- * @param silentFlag Silent flag for logging messages
+ * @param databaseDirectory Database directory
*/
- public MonetDBEmbedded(File directory, boolean silentFlag) {
+ public MonetDBEmbedded(final File databaseDirectory) {
+ this(databaseDirectory, true);
+ }
+
+ /**
+ * @param databaseDirectory Database directory
+ * @param silentFlag Silent flag
+ */
+ public MonetDBEmbedded(final File databaseDirectory, final boolean
silentFlag) {
// Load the embedded library (and its dependencies)
System.loadLibrary("embedded_java");
- if (!directory.isDirectory()) {
- throw new IllegalArgumentException(directory + " is not
a directory");
+ if (!databaseDirectory.isDirectory()) {
+ throw new IllegalArgumentException(databaseDirectory +
" is not a directory");
}
- this.directory = directory;
+ this.databaseDirectory = databaseDirectory;
this.silentFlag = silentFlag;
}
@@ -64,9 +72,9 @@ public class MonetDBEmbedded {
* @return {@code True} if the was started successfully or is already
running, otherwise {@code False}.
* @throws IOException Database startup failure
*/
- public boolean run() throws IOException {
+ public boolean start() throws IOException {
if (!running) {
- if (startupWrapper(directory.getAbsolutePath(),
silentFlag)){
+ if (startupWrapper(databaseDirectory.getAbsolutePath(),
silentFlag)){
running = true;
}
}
@@ -95,7 +103,7 @@ public class MonetDBEmbedded {
/**
* Start the embedded database up.
*
- * @param direcrory Database directory
+ * @param dir Database directory
* @param silent Silent flag
* @return Startup status code
*/
diff --git
a/java/embedded/src/main/java/org/monetdb/embedded/result/EmbeddedQueryResult.java
b/java/embedded/src/main/java/org/monetdb/embedded/result/EmbeddedQueryResult.java
---
a/java/embedded/src/main/java/org/monetdb/embedded/result/EmbeddedQueryResult.java
+++
b/java/embedded/src/main/java/org/monetdb/embedded/result/EmbeddedQueryResult.java
@@ -34,6 +34,11 @@ public class EmbeddedQueryResult impleme
* The number of columns in the query result.
*/
private int numberOfColumns;
+ /**
+ * Pointer to the native result set.
+ * We need to keep it around for getting columns.
+ * The native result set is kept until the {@link close()} is called.
+ */
private long resultPointer;
public EmbeddedQueryResult(String[] columnNames, String[] columnTypes,
int numberOfColumns, long resultPointer) {
diff --git
a/java/embedded/src/test/java/org/monetdb/embedded/test/EmbeddedTest.java
b/java/embedded/src/test/java/org/monetdb/embedded/test/EmbeddedTest.java
--- a/java/embedded/src/test/java/org/monetdb/embedded/test/EmbeddedTest.java
+++ b/java/embedded/src/test/java/org/monetdb/embedded/test/EmbeddedTest.java
@@ -34,7 +34,7 @@ public class EmbeddedTest {
Integer.valueOf(34),
Long.valueOf(45l),
Float.valueOf(5.6f),
- Double.valueOf(6.7),
+ Double.valueOf(6.7)
};
static Object[] charTypeTestValues = new Object[]{
@@ -51,8 +51,8 @@ public class EmbeddedTest {
final Path directoryPath =
Files.createTempDirectory("monetdbtest");
datbaseDirectory = directoryPath.toFile();
- db = new MonetDBEmbedded(datbaseDirectory, false);
- db.run();
+ db = new MonetDBEmbedded(datbaseDirectory);
+ db.start();
db.query("CREATE TABLE test (id integer, val integer);");
db.query("INSERT INTO test VALUES (0, " + testValues[0] + "),
(1, " + testValues[1] + "), (2, " + testValues[2] + "), (3, " + testValues[3] +
");");
@@ -73,18 +73,6 @@ public class EmbeddedTest {
}
@Test
- public void restartExistingDatabaseTest() throws IOException,
SQLException {
- MonetDBEmbedded restartedDB = new
MonetDBEmbedded(datbaseDirectory, false);
- restartedDB.run();
-
- try (EmbeddedQueryResult result = restartedDB.query("SELECT *
FROM test;")) {
- assertEquals(4, result.getColumn(1).columnSize());
- assertEquals(Integer.valueOf(20),
result.getColumn(1).getValue(1));
- assertEquals(null, result.getColumn(1).getValue(3));
- }
- }
-
- @Test
public void iteratorTest() throws IOException, SQLException {
try (EmbeddedQueryResult result = db.query("SELECT * FROM
test;")) {
@@ -198,20 +186,24 @@ public class EmbeddedTest {
}
@Test
- public void newDatabaseTest() throws IOException, SQLException {
- final Path tempDirectoryPath =
Files.createTempDirectory("monetdbtest_new");
- final File newDirectory = tempDirectoryPath.toFile();
-
- MonetDBEmbedded newDB = new MonetDBEmbedded(newDirectory,
false);
- newDB.run();
-
- newDB.query("CREATE TABLE test (id integer, val integer);");
- newDB.query("INSERT INTO test VALUES (1, 10), (2, 20), (3, 30),
(4, null);");
-
- try (EmbeddedQueryResult result = newDB.query("SELECT * FROM
world;")) {
+ public void newObjectWithSameDatabaseDirectoryTest() throws
IOException, SQLException {
+ MonetDBEmbedded sameDB = new MonetDBEmbedded(datbaseDirectory,
false);
+ // This is technically a no-op
+ sameDB.start();
+
+ try (EmbeddedQueryResult result = sameDB.query("SELECT * FROM
test;")) {
assertEquals(4, result.getColumn(1).columnSize());
assertEquals(Integer.valueOf(20),
result.getColumn(1).getValue(1));
assertEquals(null, result.getColumn(1).getValue(3));
}
}
+
+ @Test(expected=IOException.class)
+ public void newDatabaseTest() throws IOException {
+ final Path tempDirectoryPath =
Files.createTempDirectory("monetdbtest_new");
+ final File newDirectory = tempDirectoryPath.toFile();
+
+ MonetDBEmbedded newDB = new MonetDBEmbedded(newDirectory);
+ newDB.start();
+ }
}
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