!15846 add java api: CreateSession with three arguments

From: @hangangqiang
Reviewed-by: @zhanghaibo5,@zhaizhiqiang,@HilbertDavid,@jpc_chenjianping
Signed-off-by: @HilbertDavid

mindspore/lite/java/java/app/src/main/java/com/mindspore/lite/LiteSession.java

@@ -16,6 +16,7 @@
 
 package com.mindspore.lite;
 
+import java.nio.MappedByteBuffer;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
@@ -29,17 +30,39 @@ public class LiteSession {
         System.loadLibrary("mindspore-lite-jni");
     }
 
-    private long sessionPtr;
+    private long sessionPtr = 0;
 
+    // Deprecated, please use "public static LiteSession createSession(final MSConfig config)" instead.
     public LiteSession() {
         this.sessionPtr = 0;
     }
 
+    // Deprecated, please use "public static LiteSession createSession(final MSConfig config)" instead.
     public boolean init(MSConfig config) {
         this.sessionPtr = createSession(config.getMSConfigPtr());
         return this.sessionPtr != 0;
     }
 
+    public static LiteSession createSession(final MSConfig config) {
+        LiteSession liteSession = new LiteSession();
+        liteSession.sessionPtr = liteSession.createSession(config.getMSConfigPtr());
+        if (liteSession.sessionPtr == 0) {
+            return null;
+        } else {
+            return liteSession;
+        }
+    }
+
+    public static LiteSession createSession(final MappedByteBuffer buffer, final MSConfig config) {
+        LiteSession liteSession = new LiteSession();
+        liteSession.sessionPtr = liteSession.createSessionWithModel(buffer, config.getMSConfigPtr());
+        if (liteSession.sessionPtr == 0) {
+            return null;
+        } else {
+            return liteSession;
+        }
+    }
+
     public long getSessionPtr() {
         return sessionPtr;
     }
@@ -124,6 +147,8 @@ public class LiteSession {
 
     private native long createSession(long msConfigPtr);
 
+    private native long createSessionWithModel(MappedByteBuffer buffer, long msConfigPtr);
+
     private native boolean compileGraph(long sessionPtr, long modelPtr);
 
     private native void bindThread(long sessionPtr, boolean if_bind);

mindspore/lite/java/java/linux_x86/src/main/java/com.mindspore.lite/LiteSession.java

@@ -16,6 +16,7 @@
 
 package com.mindspore.lite;
 
+import java.nio.MappedByteBuffer;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
@@ -29,17 +30,39 @@ public class LiteSession {
         System.loadLibrary("mindspore-lite-jni");
     }
 
-    private long sessionPtr;
+    private long sessionPtr = 0;
 
+    // Deprecated, please use "public static LiteSession createSession(final MSConfig config)" instead.
     public LiteSession() {
         this.sessionPtr = 0;
     }
 
+    // Deprecated, please use "public static LiteSession createSession(final MSConfig config)" instead.
     public boolean init(MSConfig config) {
         this.sessionPtr = createSession(config.getMSConfigPtr());
         return this.sessionPtr != 0;
     }
 
+    public static LiteSession createSession(final MSConfig config) {
+        LiteSession liteSession = new LiteSession();
+        liteSession.sessionPtr = liteSession.createSession(config.getMSConfigPtr());
+        if (liteSession.sessionPtr == 0) {
+            return null;
+        } else {
+            return liteSession;
+        }
+    }
+
+    public static LiteSession createSession(final MappedByteBuffer buffer, final MSConfig config) {
+        LiteSession liteSession = new LiteSession();
+        liteSession.sessionPtr = liteSession.createSessionWithModel(buffer, config.getMSConfigPtr());
+        if (liteSession.sessionPtr == 0) {
+            return null;
+        } else {
+            return liteSession;
+        }
+    }
+
     public long getSessionPtr() {
         return sessionPtr;
     }
@@ -124,6 +147,8 @@ public class LiteSession {
 
     private native long createSession(long msConfigPtr);
 
+    private native long createSessionWithModel(MappedByteBuffer buffer, long msConfigPtr);
+
     private native boolean compileGraph(long sessionPtr, long modelPtr);
 
     private native void bindThread(long sessionPtr, boolean if_bind);

mindspore/lite/java/native/runtime/lite_session.cpp

@@ -15,9 +15,35 @@
  */
 
 #include <jni.h>
+#include <fstream>
 #include "common/ms_log.h"
 #include "include/lite_session.h"
 #include "include/errorcode.h"
+extern "C" JNIEXPORT jlong JNICALL Java_com_mindspore_lite_LiteSession_createSessionWithModel(JNIEnv *env, jobject thiz,
+                                                                                              jobject model_buffer,
+                                                                                              jlong ms_config_ptr) {
+  // decode model buffer and buffer size
+  if (model_buffer == nullptr) {
+    MS_LOGE("Buffer from java is nullptr");
+    return reinterpret_cast<jlong>(nullptr);
+  }
+  jlong buffer_len = env->GetDirectBufferCapacity(model_buffer);
+  auto *model_buf = static_cast<char *>(env->GetDirectBufferAddress(model_buffer));
+  // decode ms context
+  auto *pointer = reinterpret_cast<void *>(ms_config_ptr);
+  if (pointer == nullptr) {
+    MS_LOGE("Context pointer from java is nullptr");
+    return jlong(nullptr);
+  }
+  auto *lite_context_ptr = static_cast<mindspore::lite::Context *>(pointer);
+  // create session
+  auto session = mindspore::session::LiteSession::CreateSession(model_buf, buffer_len, lite_context_ptr);
+  if (session == nullptr) {
+    MS_LOGE("CreateSession failed");
+    return jlong(nullptr);
+  }
+  return jlong(session);
+}
 
 extern "C" JNIEXPORT jlong JNICALL Java_com_mindspore_lite_LiteSession_createSession(JNIEnv *env, jobject thiz,
                                                                                      jlong ms_config_ptr) {