Add Xodus key/value database.

CHANGES.txt

@@ -2,6 +2,7 @@ Version 4.1.0
 
     - Added console support for configuring a required password
     - Updated a bunch of dependencies
+    - Added Xodus key/value database
 
 Version 4.0.3 Released January 20, 2018
 

permazen-demo/pom.xml

@@ -60,6 +60,10 @@
             <groupId>${project.groupId}</groupId>
             <artifactId>${project.parent.artifactId}-kv-leveldb</artifactId>
         </dependency>
+        <dependency>
+            <groupId>${project.groupId}</groupId>
+            <artifactId>${project.parent.artifactId}-kv-mssql</artifactId>
+        </dependency>
         <dependency>
             <groupId>${project.groupId}</groupId>
             <artifactId>${project.parent.artifactId}-kv-mysql</artifactId>
@@ -84,6 +88,10 @@
             <groupId>${project.groupId}</groupId>
             <artifactId>${project.parent.artifactId}-kv-sqlite</artifactId>
         </dependency>
+        <dependency>
+            <groupId>${project.groupId}</groupId>
+            <artifactId>${project.parent.artifactId}-kv-xodus</artifactId>
+        </dependency>
         <dependency>
             <groupId>${project.groupId}</groupId>
             <artifactId>${project.parent.artifactId}-util</artifactId>

permazen-kv-xodus/pom.xml

@@ -0,0 +1,57 @@
+<?xml version="1.0"?>
+
+<project
+  xmlns="http://maven.apache.org/POM/4.0.0"
+  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <parent>
+        <groupId>io.permazen</groupId>
+        <artifactId>permazen</artifactId>
+        <version>4.1.0-SNAPSHOT</version>
+    </parent>
+    <artifactId>permazen-kv-xodus</artifactId>
+    <name>Permazen Xodus Key/Value Store</name>
+    <description>Permazen key/value store implementation based on Xodus.</description>
+    <distributionManagement>
+        <site>
+            <id>${project.artifactId}-site</id>
+            <url>file://${project.basedir}/../site/${project.artifactId}/</url>
+        </site>
+    </distributionManagement>
+    <dependencies>
+        <dependency>
+            <groupId>${project.groupId}</groupId>
+            <artifactId>${project.parent.artifactId}-kv</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>${project.groupId}</groupId>
+            <artifactId>${project.parent.artifactId}-kv-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>${project.groupId}</groupId>
+            <artifactId>${project.parent.artifactId}-util</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.jetbrains.xodus</groupId>
+            <artifactId>xodus-environment</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.jetbrains.xodus</groupId>
+            <artifactId>xodus-openAPI</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-api</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-log4j12</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>log4j</groupId>
+            <artifactId>log4j</artifactId>
+        </dependency>
+    </dependencies>
+</project>

permazen-kv-xodus/src/main/java/io/permazen/kv/xodus/TransactionType.java

@@ -0,0 +1,64 @@
+
+/*
+ * Copyright (C) 2015 Archie L. Cobbs. All rights reserved.
+ */
+
+package io.permazen.kv.xodus;
+
+import com.google.common.base.Preconditions;
+
+import java.util.function.Function;
+
+import jetbrains.exodus.env.Environment;
+import jetbrains.exodus.env.Transaction;
+
+/**
+ * Xodus transaction types.
+ */
+public enum TransactionType implements Function<Environment, Transaction> {
+
+    /**
+     * Read-only transaction.
+     *
+     * @see Environment#beginReadonlyTransaction
+     */
+    READ_ONLY(true, false, Environment::beginReadonlyTransaction),
+
+    /**
+     * Normal read-write transaction.
+     *
+     * @see Environment#beginTransaction
+     */
+    READ_WRITE(false, false, Environment::beginTransaction),
+
+    /**
+     * Exclusive read-write transaction.
+     *
+     * @see Environment#beginExclusiveTransaction
+     */
+    READ_WRITE_EXCLUSIVE(false, true, Environment::beginExclusiveTransaction);
+
+    private final boolean readOnly;
+    private final boolean exclusive;
+    private final Function<Environment, Transaction> creator;
+
+    TransactionType(boolean readOnly, boolean exclusive, Function<Environment, Transaction> creator) {
+        this.readOnly = readOnly;
+        this.exclusive = exclusive;
+        this.creator = creator;
+    }
+
+    public boolean isReadOnly() {
+        return this.readOnly;
+    }
+
+    public boolean isExclusive() {
+        return this.exclusive;
+    }
+
+    @Override
+    public Transaction apply(Environment env) {
+        Preconditions.checkArgument(env != null, "null env");
+        return this.creator.apply(env);
+    }
+}