- Changed Native.get() to cache integration instances.

- Extracted DefaultSystemInfo out of a couple of separate places.

src/main/java/net/rubygrapefruit/platform/Native.java

@@ -5,6 +5,8 @@ import net.rubygrapefruit.platform.internal.Platform;
 import net.rubygrapefruit.platform.internal.jni.NativeLibraryFunctions;
 
 import java.io.File;
+import java.util.HashMap;
+import java.util.Map;
 
 /**
  * Provides access to the native integrations. Use {@link #get(Class)} to load a particular integration.
@@ -12,6 +14,7 @@ import java.io.File;
 @ThreadSafe
 public class Native {
     private static boolean loaded;
+    private static final Map<Class<?>, Object> integrations = new HashMap<Class<?>, Object>();
 
     private Native() {
     }
@@ -59,13 +62,19 @@ public class Native {
     public static <T extends NativeIntegration> T get(Class<T> type)
             throws NativeIntegrationUnavailableException, NativeException {
         init(null);
-        try {
-            Platform platform = Platform.current();
-            return platform.get(type);
-        } catch (NativeException e) {
-            throw e;
-        } catch (Throwable t) {
-            throw new NativeException(String.format("Failed to load native integration %s.", type.getSimpleName()), t);
+        synchronized (Native.class) {
+            Object instance = integrations.get(type);
+            if (instance == null) {
+                try {
+                    instance = Platform.current().get(type);
+                } catch (NativeException e) {
+                    throw e;
+                } catch (Throwable t) {
+                    throw new NativeException(String.format("Failed to load native integration %s.", type.getSimpleName()), t);
+                }
+                integrations.put(type, instance);
+            }
+            return type.cast(instance);
         }
     }
 }

src/main/java/net/rubygrapefruit/platform/internal/AbstractTerminals.java

@@ -4,11 +4,12 @@ import net.rubygrapefruit.platform.Terminal;
 import net.rubygrapefruit.platform.Terminals;
 
 public abstract class AbstractTerminals implements Terminals {
-    private static Output currentlyOpen;
-    private static AbstractTerminal current;
+    private final Object lock = new Object();
+    private Output currentlyOpen;
+    private AbstractTerminal current;
 
     public Terminal getTerminal(Output output) {
-        synchronized (AbstractTerminals.class) {
+        synchronized (lock) {
             if (currentlyOpen != null && currentlyOpen != output) {
                 throw new UnsupportedOperationException("Currently only one output can be used as a terminal.");
             }

src/main/java/net/rubygrapefruit/platform/internal/DefaultPosixFile.java

@@ -2,7 +2,6 @@ package net.rubygrapefruit.platform.internal;
 
 import net.rubygrapefruit.platform.NativeException;
 import net.rubygrapefruit.platform.PosixFile;
-import net.rubygrapefruit.platform.internal.jni.NativeLibraryFunctions;
 import net.rubygrapefruit.platform.internal.jni.PosixFileFunctions;
 
 import java.io.File;
@@ -12,14 +11,8 @@ public class DefaultPosixFile implements PosixFile {
     private final String characterEncoding;
 
     public DefaultPosixFile() {
-        MutableSystemInfo systemInfo = new MutableSystemInfo();
-        FunctionResult result = new FunctionResult();
-        NativeLibraryFunctions.getSystemInfo(systemInfo, result);
-        if (result.isFailed()) {
-            throw new NativeException(String.format("Could not fetch system information: %s",
-                    result.getMessage()));
-        }
-        this.characterEncoding = systemInfo.characterEncoding;
+        DefaultSystemInfo systemInfo = new DefaultSystemInfo();
+        this.characterEncoding = systemInfo.getCharacterEncoding();
     }
 
     public void setMode(File file, int perms) {

src/main/java/net/rubygrapefruit/platform/internal/DefaultSystemInfo.java

@@ -0,0 +1,37 @@
+package net.rubygrapefruit.platform.internal;
+
+import net.rubygrapefruit.platform.NativeException;
+import net.rubygrapefruit.platform.SystemInfo;
+import net.rubygrapefruit.platform.internal.jni.NativeLibraryFunctions;
+
+public class DefaultSystemInfo implements SystemInfo {
+    MutableSystemInfo systemInfo = new MutableSystemInfo();
+
+    public DefaultSystemInfo() {
+        FunctionResult result = new FunctionResult();
+        NativeLibraryFunctions.getSystemInfo(systemInfo, result);
+        if (result.isFailed()) {
+            throw new NativeException(String.format("Could not fetch system information: %s",
+                    result.getMessage()));
+        }
+    }
+
+    @Override
+    public String getKernelName() {
+        return systemInfo.getKernelName();
+    }
+
+    @Override
+    public String getKernelVersion() {
+        return systemInfo.getKernelVersion();
+    }
+
+    @Override
+    public String getMachineArchitecture() {
+        return systemInfo.getMachineArchitecture();
+    }
+
+    public String getCharacterEncoding() {
+        return systemInfo.characterEncoding;
+    }
+}

src/main/java/net/rubygrapefruit/platform/internal/Platform.java

@@ -2,7 +2,6 @@ package net.rubygrapefruit.platform.internal;
 
 import net.rubygrapefruit.platform.*;
 import net.rubygrapefruit.platform.Process;
-import net.rubygrapefruit.platform.internal.jni.NativeLibraryFunctions;
 
 public abstract class Platform {
     private static Platform platform;
@@ -75,14 +74,7 @@ public abstract class Platform {
                 return type.cast(new TerminfoTerminals());
             }
             if (type.equals(SystemInfo.class)) {
-                MutableSystemInfo systemInfo = new MutableSystemInfo();
-                FunctionResult result = new FunctionResult();
-                NativeLibraryFunctions.getSystemInfo(systemInfo, result);
-                if (result.isFailed()) {
-                    throw new NativeException(String.format("Could not fetch system information: %s",
-                            result.getMessage()));
-                }
-                return type.cast(systemInfo);
+                return type.cast(new DefaultSystemInfo());
             }
             return super.get(type);
         }