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Lucene example source code file (NativePosixUtil.cpp)
The Lucene NativePosixUtil.cpp source code/** * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with this * work for additional information regarding copyright ownership. The ASF * licenses this file to You under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the * License for the specific language governing permissions and limitations under * the License. */ #include <jni.h> #include <fcntl.h> // posix_fadvise, constants for open #include <string.h> // strerror #include <errno.h> // errno #include <unistd.h> // pread #include <sys/mman.h> // posix_madvise, madvise #include <sys/types.h> // constants for open #include <sys/stat.h> // constants for open // java -cp .:lib/junit-4.7.jar:./build/classes/test:./build/classes/java:./build/classes/demo -Dlucene.version=2.9-dev -DtempDir=build -ea org.junit.runner.JUnitCore org.apache.lucene.index.TestDoc /* * Class: org_apache_lucene_store_NativePosixUtil * Method: posix_fadvise * Signature: (Ljava/io/FileDescriptor;JJI)V */ extern "C" JNIEXPORT jint JNICALL Java_org_apache_lucene_store_NativePosixUtil_posix_1fadvise(JNIEnv *env, jclass _ignore, jobject fileDescriptor, jlong offset, jlong len, jint advice) { jfieldID field_fd; jmethodID const_fdesc; jclass ioex = env->FindClass("java/io/IOException"); if (ioex == NULL) { return -1; } jclass fdesc = env->FindClass("java/io/FileDescriptor"); if (fdesc == NULL) { return -2; } // read the int fd field jfieldID fdField = env->GetFieldID(fdesc, "fd", "I"); if (fdField == NULL) { return -3; } int fd = env->GetIntField(fileDescriptor, fdField); //printf("fd=%d\n", fd); fflush(stdout); int osAdvice; switch(advice) { case 0: osAdvice = POSIX_FADV_NORMAL; break; case 1: osAdvice = POSIX_FADV_SEQUENTIAL; break; case 2: osAdvice = POSIX_FADV_RANDOM; break; case 3: osAdvice = POSIX_FADV_WILLNEED; break; case 4: osAdvice = POSIX_FADV_DONTNEED; break; case 5: osAdvice = POSIX_FADV_NOREUSE; break; } int result = posix_fadvise(fd, (off_t) offset, (off_t) len, osAdvice); if (result == 0) { // ok } else { env->ThrowNew(ioex, strerror(errno)); return -1; } return 0; } /* * Class: org_apache_lucene_store_NativePosixUtil * Method: open_direct * Signature: (Ljava/lang/String;Z)Ljava/io/FileDescriptor; */ extern "C" JNIEXPORT jobject JNICALL Java_org_apache_lucene_store_NativePosixUtil_open_1direct(JNIEnv *env, jclass _ignore, jstring filename, jboolean readOnly) { jfieldID field_fd; jmethodID const_fdesc; jclass class_fdesc, class_ioex; jobject ret; int fd; char *fname; class_ioex = env->FindClass("java/io/IOException"); if (class_ioex == NULL) return NULL; class_fdesc = env->FindClass("java/io/FileDescriptor"); if (class_fdesc == NULL) return NULL; fname = (char *) env->GetStringUTFChars(filename, NULL); if (readOnly) { fd = open(fname, O_RDONLY | O_DIRECT | O_NOATIME); } else { fd = open(fname, O_RDWR | O_CREAT | O_DIRECT | O_NOATIME, 0666); } //printf("open %s -> %d; ro %d\n", fname, fd, readOnly); fflush(stdout); env->ReleaseStringUTFChars(filename, fname); if (fd < 0) { // open returned an error. Throw an IOException with the error string env->ThrowNew(class_ioex, strerror(errno)); return NULL; } // construct a new FileDescriptor const_fdesc = env->GetMethodID(class_fdesc, "<init>", "()V"); if (const_fdesc == NULL) return NULL; ret = env->NewObject(class_fdesc, const_fdesc); // poke the "fd" field with the file descriptor field_fd = env->GetFieldID(class_fdesc, "fd", "I"); if (field_fd == NULL) return NULL; env->SetIntField(ret, field_fd, fd); // and return it return ret; } /* * Class: org_apache_lucene_store_NativePosixUtil * Method: pread * Signature: (Ljava/io/FileDescriptor;JLjava/nio/ByteBuffer;)I */ extern "C" JNIEXPORT jlong JNICALL Java_org_apache_lucene_store_NativePosixUtil_pread(JNIEnv *env, jclass _ignore, jobject jfd, jlong pos, jobject byteBuf) { // get int fd: jclass class_fdesc = env->FindClass("java/io/FileDescriptor"); if (class_fdesc == NULL) { return -1; } jfieldID field_fd = env->GetFieldID(class_fdesc, "fd", "I"); if (field_fd == NULL) { return -1; } const int fd = env->GetIntField(jfd, field_fd); void *p = env->GetDirectBufferAddress(byteBuf); if (p == NULL) { return -1; } size_t size = (size_t) env->GetDirectBufferCapacity(byteBuf); if (size <= 0) { return -1; } size_t numBytesRead = pread(fd, p, (size_t) size, (off_t) pos); if (numBytesRead == -1) { jclass class_ioex = env->FindClass("java/io/IOException"); if (class_ioex == NULL) { return -1; } env->ThrowNew(class_ioex, strerror(errno)); return -1; } return (jlong) numBytesRead; } /* * Class: org_apache_lucene_store_NativePosixUtil * Method: posix_madvise * Signature: (Ljava/nio/ByteBuffer;I)I */ extern "C" JNIEXPORT jint JNICALL Java_org_apache_lucene_store_NativePosixUtil_posix_1madvise(JNIEnv *env, jclass _ignore, jobject buffer, jint advice) { void *p = env->GetDirectBufferAddress(buffer); if (p == NULL) { return -1; } size_t size = (size_t) env->GetDirectBufferCapacity(buffer); if (size <= 0) { return -1; } int page = getpagesize(); // round start down to start of page long long start = (long long) p; start = start & (~(page-1)); // round end up to start of page long long end = start + size; end = (end + page-1)&(~(page-1)); size = (end-start); int osAdvice; switch(advice) { case 0: osAdvice = POSIX_MADV_NORMAL; break; case 1: osAdvice = POSIX_MADV_SEQUENTIAL; break; case 2: osAdvice = POSIX_MADV_RANDOM; break; case 3: osAdvice = POSIX_MADV_WILLNEED; break; case 4: osAdvice = POSIX_MADV_DONTNEED; break; case 5: return -1; break; } //printf("DO posix_madvise: %lx %d\n", p, size);fflush(stdout); if (posix_madvise((void *) start, size, osAdvice) != 0) { jclass class_ioex = env->FindClass("java/io/IOException"); if (class_ioex == NULL) { return -1; } env->ThrowNew(class_ioex, strerror(errno)); return -1; } return 0; } /* * Class: org_apache_lucene_store_NativePosixUtil * Method: madvise * Signature: (Ljava/nio/ByteBuffer;I)I */ extern "C" JNIEXPORT jint JNICALL Java_org_apache_lucene_store_NativePosixUtil_madvise(JNIEnv *env, jclass _ignore, jobject buffer, jint advice) { void *p = env->GetDirectBufferAddress(buffer); if (p == NULL) { return -1; } size_t size = (size_t) env->GetDirectBufferCapacity(buffer); if (size <= 0) { return -1; } int page = getpagesize(); // round start down to start of page long long start = (long long) p; start = start & (~(page-1)); // round end up to start of page long long end = start + size; end = (end + page-1)&(~(page-1)); size = (end-start); int osAdvice; switch(advice) { case 0: osAdvice = MADV_NORMAL; break; case 1: osAdvice = MADV_SEQUENTIAL; break; case 2: osAdvice = MADV_RANDOM; break; case 3: osAdvice = MADV_WILLNEED; break; case 4: osAdvice = MADV_DONTNEED; break; case 5: return -1; break; } //printf("DO madvise: page=%d p=0x%lx 0x%lx size=0x%lx\n", page, p, start, size);fflush(stdout); if (madvise((void *) start, size, osAdvice) != 0) { jclass class_ioex = env->FindClass("java/io/IOException"); if (class_ioex == NULL) { return -1; } env->ThrowNew(class_ioex, strerror(errno)); return -1; } return 0; } Other Lucene examples (source code examples)Here is a short list of links related to this Lucene NativePosixUtil.cpp source code file: |
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