rocksdb/java/rocksjni/portal.h

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// Copyright (c) 2014, Facebook, Inc. All rights reserved.
// This source code is licensed under the BSD-style license found in the
// LICENSE file in the root directory of this source tree. An additional grant
// of patent rights can be found in the PATENTS file in the same directory.
// This file is designed for caching those frequently used IDs and provide
// efficient portal (i.e, a set of static functions) to access java code
// from c++.
#ifndef JAVA_ROCKSJNI_PORTAL_H_
#define JAVA_ROCKSJNI_PORTAL_H_
#include <jni.h>
#include <limits>
#include "rocksdb/db.h"
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#include "rocksdb/filter_policy.h"
#include "rocksdb/utilities/backupable_db.h"
namespace rocksdb {
inline size_t jlong_to_size_t(const jlong& jvalue) {
return static_cast<uint64_t>(jvalue) <=
static_cast<uint64_t>(std::numeric_limits<size_t>::max()) ?
static_cast<size_t>(jvalue) : std::numeric_limits<size_t>::max();
}
// The portal class for org.rocksdb.RocksDB
class RocksDBJni {
public:
// Get the java class id of org.rocksdb.RocksDB.
static jclass getJClass(JNIEnv* env) {
jclass jclazz = env->FindClass("org/rocksdb/RocksDB");
assert(jclazz != nullptr);
return jclazz;
}
// Get the field id of the member variable of org.rocksdb.RocksDB
// that stores the pointer to rocksdb::DB.
static jfieldID getHandleFieldID(JNIEnv* env) {
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static jfieldID fid = env->GetFieldID(
getJClass(env), "nativeHandle_", "J");
assert(fid != nullptr);
return fid;
}
// Get the pointer to rocksdb::DB of the specified org.rocksdb.RocksDB.
static rocksdb::DB* getHandle(JNIEnv* env, jobject jdb) {
return reinterpret_cast<rocksdb::DB*>(
env->GetLongField(jdb, getHandleFieldID(env)));
}
// Pass the rocksdb::DB pointer to the java side.
static void setHandle(JNIEnv* env, jobject jdb, rocksdb::DB* db) {
env->SetLongField(
jdb, getHandleFieldID(env),
reinterpret_cast<jlong>(db));
}
};
// The portal class for org.rocksdb.RocksDBException
class RocksDBExceptionJni {
public:
// Get the jclass of org.rocksdb.RocksDBException
static jclass getJClass(JNIEnv* env) {
jclass jclazz = env->FindClass("org/rocksdb/RocksDBException");
assert(jclazz != nullptr);
return jclazz;
}
// Create and throw a java exception by converting the input
// Status to an RocksDBException.
//
// In case s.ok() is true, then this function will not throw any
// exception.
static void ThrowNew(JNIEnv* env, Status s) {
if (s.ok()) {
return;
}
jstring msg = env->NewStringUTF(s.ToString().c_str());
// get the constructor id of org.rocksdb.RocksDBException
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static jmethodID mid = env->GetMethodID(
getJClass(env), "<init>", "(Ljava/lang/String;)V");
assert(mid != nullptr);
env->Throw((jthrowable)env->NewObject(getJClass(env), mid, msg));
}
};
class OptionsJni {
public:
// Get the java class id of org.rocksdb.Options.
static jclass getJClass(JNIEnv* env) {
jclass jclazz = env->FindClass("org/rocksdb/Options");
assert(jclazz != nullptr);
return jclazz;
}
// Get the field id of the member variable of org.rocksdb.Options
// that stores the pointer to rocksdb::Options
static jfieldID getHandleFieldID(JNIEnv* env) {
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static jfieldID fid = env->GetFieldID(
getJClass(env), "nativeHandle_", "J");
assert(fid != nullptr);
return fid;
}
// Get the pointer to rocksdb::Options
static rocksdb::Options* getHandle(JNIEnv* env, jobject jobj) {
return reinterpret_cast<rocksdb::Options*>(
env->GetLongField(jobj, getHandleFieldID(env)));
}
// Pass the rocksdb::Options pointer to the java side.
static void setHandle(JNIEnv* env, jobject jobj, rocksdb::Options* op) {
env->SetLongField(
jobj, getHandleFieldID(env),
reinterpret_cast<jlong>(op));
}
};
class WriteOptionsJni {
public:
// Get the java class id of org.rocksdb.WriteOptions.
static jclass getJClass(JNIEnv* env) {
jclass jclazz = env->FindClass("org/rocksdb/WriteOptions");
assert(jclazz != nullptr);
return jclazz;
}
// Get the field id of the member variable of org.rocksdb.WriteOptions
// that stores the pointer to rocksdb::WriteOptions
static jfieldID getHandleFieldID(JNIEnv* env) {
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static jfieldID fid = env->GetFieldID(
getJClass(env), "nativeHandle_", "J");
assert(fid != nullptr);
return fid;
}
// Get the pointer to rocksdb::WriteOptions
static rocksdb::WriteOptions* getHandle(JNIEnv* env, jobject jobj) {
return reinterpret_cast<rocksdb::WriteOptions*>(
env->GetLongField(jobj, getHandleFieldID(env)));
}
// Pass the rocksdb::WriteOptions pointer to the java side.
static void setHandle(JNIEnv* env, jobject jobj, rocksdb::WriteOptions* op) {
env->SetLongField(
jobj, getHandleFieldID(env),
reinterpret_cast<jlong>(op));
}
};
class ReadOptionsJni {
public:
// Get the java class id of org.rocksdb.ReadOptions.
static jclass getJClass(JNIEnv* env) {
jclass jclazz = env->FindClass("org/rocksdb/ReadOptions");
assert(jclazz != nullptr);
return jclazz;
}
// Get the field id of the member variable of org.rocksdb.ReadOptions
// that stores the pointer to rocksdb::ReadOptions
static jfieldID getHandleFieldID(JNIEnv* env) {
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static jfieldID fid = env->GetFieldID(
getJClass(env), "nativeHandle_", "J");
assert(fid != nullptr);
return fid;
}
// Get the pointer to rocksdb::ReadOptions
static rocksdb::ReadOptions* getHandle(JNIEnv* env, jobject jobj) {
return reinterpret_cast<rocksdb::ReadOptions*>(
env->GetLongField(jobj, getHandleFieldID(env)));
}
// Pass the rocksdb::ReadOptions pointer to the java side.
static void setHandle(JNIEnv* env, jobject jobj,
rocksdb::ReadOptions* op) {
env->SetLongField(
jobj, getHandleFieldID(env),
reinterpret_cast<jlong>(op));
}
};
class WriteBatchJni {
public:
static jclass getJClass(JNIEnv* env) {
jclass jclazz = env->FindClass("org/rocksdb/WriteBatch");
assert(jclazz != nullptr);
return jclazz;
}
static jfieldID getHandleFieldID(JNIEnv* env) {
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static jfieldID fid = env->GetFieldID(
getJClass(env), "nativeHandle_", "J");
assert(fid != nullptr);
return fid;
}
// Get the pointer to rocksdb::WriteBatch of the specified
// org.rocksdb.WriteBatch.
static rocksdb::WriteBatch* getHandle(JNIEnv* env, jobject jwb) {
return reinterpret_cast<rocksdb::WriteBatch*>(
env->GetLongField(jwb, getHandleFieldID(env)));
}
// Pass the rocksdb::WriteBatch pointer to the java side.
static void setHandle(JNIEnv* env, jobject jwb, rocksdb::WriteBatch* wb) {
env->SetLongField(
jwb, getHandleFieldID(env),
reinterpret_cast<jlong>(wb));
}
};
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class HistogramDataJni {
public:
static jmethodID getConstructorMethodId(JNIEnv* env, jclass jclazz) {
static jmethodID mid = env->GetMethodID(jclazz, "<init>", "(DDDDD)V");
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assert(mid != nullptr);
return mid;
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}
};
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class BackupableDBOptionsJni {
public:
// Get the java class id of org.rocksdb.BackupableDBOptions.
static jclass getJClass(JNIEnv* env) {
jclass jclazz = env->FindClass("org/rocksdb/BackupableDBOptions");
assert(jclazz != nullptr);
return jclazz;
}
// Get the field id of the member variable of org.rocksdb.BackupableDBOptions
// that stores the pointer to rocksdb::BackupableDBOptions
static jfieldID getHandleFieldID(JNIEnv* env) {
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static jfieldID fid = env->GetFieldID(
getJClass(env), "nativeHandle_", "J");
assert(fid != nullptr);
return fid;
}
// Get the pointer to rocksdb::BackupableDBOptions
static rocksdb::BackupableDBOptions* getHandle(JNIEnv* env, jobject jobj) {
return reinterpret_cast<rocksdb::BackupableDBOptions*>(
env->GetLongField(jobj, getHandleFieldID(env)));
}
// Pass the rocksdb::BackupableDBOptions pointer to the java side.
static void setHandle(
JNIEnv* env, jobject jobj, rocksdb::BackupableDBOptions* op) {
env->SetLongField(
jobj, getHandleFieldID(env),
reinterpret_cast<jlong>(op));
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}
};
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class IteratorJni {
public:
// Get the java class id of org.rocksdb.Iteartor.
static jclass getJClass(JNIEnv* env) {
jclass jclazz = env->FindClass("org/rocksdb/RocksIterator");
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assert(jclazz != nullptr);
return jclazz;
}
// Get the field id of the member variable of org.rocksdb.Iterator
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// that stores the pointer to rocksdb::Iterator.
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static jfieldID getHandleFieldID(JNIEnv* env) {
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static jfieldID fid = env->GetFieldID(
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getJClass(env), "nativeHandle_", "J");
assert(fid != nullptr);
return fid;
}
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// Get the pointer to rocksdb::Iterator.
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static rocksdb::Iterator* getHandle(JNIEnv* env, jobject jobj) {
return reinterpret_cast<rocksdb::Iterator*>(
env->GetLongField(jobj, getHandleFieldID(env)));
}
// Pass the rocksdb::Iterator pointer to the java side.
static void setHandle(
JNIEnv* env, jobject jobj, rocksdb::Iterator* op) {
env->SetLongField(
jobj, getHandleFieldID(env),
reinterpret_cast<jlong>(op));
}
};
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class FilterJni {
public:
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// Get the java class id of org.rocksdb.FilterPolicy.
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static jclass getJClass(JNIEnv* env) {
jclass jclazz = env->FindClass("org/rocksdb/Filter");
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assert(jclazz != nullptr);
return jclazz;
}
// Get the field id of the member variable of org.rocksdb.Filter
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// that stores the pointer to rocksdb::FilterPolicy.
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static jfieldID getHandleFieldID(JNIEnv* env) {
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static jfieldID fid = env->GetFieldID(
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getJClass(env), "nativeHandle_", "J");
assert(fid != nullptr);
return fid;
}
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// Get the pointer to rocksdb::FilterPolicy.
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static rocksdb::FilterPolicy* getHandle(JNIEnv* env, jobject jobj) {
return reinterpret_cast<rocksdb::FilterPolicy*>(
env->GetLongField(jobj, getHandleFieldID(env)));
}
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// Pass the rocksdb::FilterPolicy pointer to the java side.
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static void setHandle(
JNIEnv* env, jobject jobj, const rocksdb::FilterPolicy* op) {
env->SetLongField(
jobj, getHandleFieldID(env),
reinterpret_cast<jlong>(op));
}
};
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class ListJni {
public:
// Get the java class id of java.util.List.
static jclass getListClass(JNIEnv* env) {
jclass jclazz = env->FindClass("java/util/List");
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assert(jclazz != nullptr);
return jclazz;
}
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// Get the java class id of java.util.ArrayList.
static jclass getArrayListClass(JNIEnv* env) {
jclass jclazz = env->FindClass("java/util/ArrayList");
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assert(jclazz != nullptr);
return jclazz;
}
// Get the java class id of java.util.Iterator.
static jclass getIteratorClass(JNIEnv* env) {
jclass jclazz = env->FindClass("java/util/Iterator");
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assert(jclazz != nullptr);
return jclazz;
}
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// Get the java method id of java.util.List.iterator().
static jmethodID getIteratorMethod(JNIEnv* env) {
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static jmethodID mid = env->GetMethodID(
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getListClass(env), "iterator", "()Ljava/util/Iterator;");
assert(mid != nullptr);
return mid;
}
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// Get the java method id of java.util.Iterator.hasNext().
static jmethodID getHasNextMethod(JNIEnv* env) {
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static jmethodID mid = env->GetMethodID(
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getIteratorClass(env), "hasNext", "()Z");
assert(mid != nullptr);
return mid;
}
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// Get the java method id of java.util.Iterator.next().
static jmethodID getNextMethod(JNIEnv* env) {
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static jmethodID mid = env->GetMethodID(
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getIteratorClass(env), "next", "()Ljava/lang/Object;");
assert(mid != nullptr);
return mid;
}
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// Get the java method id of arrayList constructor.
static jmethodID getArrayListConstructorMethodId(JNIEnv* env, jclass jclazz) {
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static jmethodID mid = env->GetMethodID(
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jclazz, "<init>", "(I)V");
assert(mid != nullptr);
return mid;
}
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// Get the java method id of java.util.List.add().
static jmethodID getListAddMethodId(JNIEnv* env) {
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static jmethodID mid = env->GetMethodID(
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getListClass(env), "add", "(Ljava/lang/Object;)Z");
assert(mid != nullptr);
return mid;
}
};
} // namespace rocksdb
#endif // JAVA_ROCKSJNI_PORTAL_H_