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AndroidSQLiteDBLogStorage.java
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AndroidSQLiteDBLogStorage.java
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/*
* Copyright 2014-2016 CyberVision, Inc.
*
* Licensed 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.
*/
package org.kaaproject.kaa.client.logging;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteException;
import android.database.sqlite.SQLiteOpenHelper;
import android.database.sqlite.SQLiteStatement;
import android.util.Log;
import java.util.Arrays;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
public class AndroidSQLiteDBLogStorage implements LogStorage, LogStorageStatus {
private static final String TAG = "AndroidSQLiteDBLogStorage";
private static final String CHANGES_QUERY_RESULT = "affected_row_count";
private static final String GET_CHANGES_QUERY = "SELECT changes() AS " + CHANGES_QUERY_RESULT;
private final SQLiteOpenHelper dbHelper;
private final SQLiteDatabase database;
private long totalRecordCount;
private long unmarkedRecordCount;
private long unmarkedConsumedSize;
private int currentBucketId = 1;
private long currentBucketSize;
private int currentRecordCount;
private long maxBucketSize;
private int maxRecordCount;
private Map<Integer, Long> consumedMemoryStorage = new HashMap<>();
private SQLiteStatement insertStatement;
private SQLiteStatement deleteByBucketIdStatement;
private SQLiteStatement updateBucketStateStatement;
private SQLiteStatement resetBucketIdStatement;
public AndroidSQLiteDBLogStorage(Context context, long maxBucketSize, int maxRecordCount) {
this(context, PersistentLogStorageConstants.DEFAULT_DB_NAME, maxBucketSize, maxRecordCount);
}
public AndroidSQLiteDBLogStorage(Context context, String dbName, long bucketSize, int recordCount) {
Log.i(TAG, "Connecting to db with name: " + dbName);
dbHelper = new DataCollectionDBHelper(context, dbName);
database = dbHelper.getWritableDatabase();
this.maxRecordCount = recordCount;
this.maxBucketSize = bucketSize;
truncateIfBucketSizeIncompatible();
retrieveConsumedSizeAndVolume();
if (totalRecordCount > 0) {
retrieveBucketId();
resetBucketsState();
}
}
@Override
public BucketInfo addLogRecord(LogRecord record) {
synchronized (database) {
Log.d(TAG, "Adding a new log record...");
if (insertStatement == null) {
try {
insertStatement = database.compileStatement(PersistentLogStorageConstants.KAA_INSERT_NEW_RECORD);
} catch (SQLiteException ex) {
Log.e(TAG, "Can't create row insert statement", ex);
throw new RuntimeException(ex);
}
}
long leftConsumedSize = maxBucketSize - currentBucketSize;
long leftRecordCount = maxRecordCount - currentRecordCount;
if (leftConsumedSize < record.getSize() || leftRecordCount == 0) {
moveToNextBucket();
}
try {
insertStatement.bindLong(1, currentBucketId);
insertStatement.bindBlob(2, record.getData());
long insertedId = insertStatement.executeInsert();
if (insertedId >= 0) {
currentBucketSize += record.getSize();
currentRecordCount++;
unmarkedConsumedSize += record.getSize();
totalRecordCount++;
unmarkedRecordCount++;
Log.i(TAG, "Added a new log record, total record count: " + totalRecordCount + ", data: " + Arrays.toString(record.getData()) +
"unmarked record count: " + unmarkedRecordCount);
} else {
Log.w(TAG, "No log record was added");
}
} catch (SQLiteException e) {
Log.e(TAG, "Can't add a new record", e);
}
}
return new BucketInfo(currentBucketId, currentRecordCount);
}
@Override
public LogStorageStatus getStatus() {
return this;
}
@Override
public LogBucket getNextBucket() {
synchronized (database) {
Log.d(TAG, "Creating a new record block");
LogBucket logBlock = null;
Cursor cursor = null;
List<LogRecord> logRecords = new LinkedList<>();
int bucketId = 0;
try {
cursor = database.rawQuery(PersistentLogStorageConstants.KAA_SELECT_MIN_BUCKET_ID, null);
if (cursor.moveToFirst()) {
bucketId = cursor.getInt(0);
}
} catch (SQLiteException ex) {
Log.e(TAG, "Can't retrieve min bucket ID", ex);
} finally {
try {
tryCloseCursor(cursor);
} catch (SQLiteException ex) {
Log.e(TAG, "Unable to close cursor", ex);
}
}
try {
long leftBucketSize = maxBucketSize;
if (bucketId > 0) {
cursor = database.rawQuery(PersistentLogStorageConstants.KAA_SELECT_LOG_RECORDS_BY_BUCKET_ID,
new String[]{String.valueOf(bucketId)});
while (cursor.moveToNext()) {
byte[] recordData = cursor.getBlob(0);
logRecords.add(new LogRecord(recordData));
leftBucketSize -= recordData.length;
}
if (!logRecords.isEmpty()) {
updateBucketState(bucketId);
logBlock = new LogBucket(bucketId, logRecords);
long logBlockSize = maxBucketSize - leftBucketSize;
unmarkedConsumedSize -= logBlockSize;
unmarkedRecordCount -= logRecords.size();
consumedMemoryStorage.put(logBlock.getBucketId(), logBlockSize);
if (currentBucketId == bucketId) {
moveToNextBucket();
}
Log.i(TAG, "Created log block: id [" + logBlock.getBucketId() + "], size: " +
logBlockSize + ". Log block record count: " +
logBlock.getRecords().size() + ", total record count: " + totalRecordCount +
", unmarked record count: " + unmarkedRecordCount);
} else {
Log.i(TAG, "No unmarked log records found");
}
}
} catch (SQLiteException ex) {
Log.e(TAG, "Can't retrieve unmarked records from storage", ex);
} finally {
try {
tryCloseCursor(cursor);
} catch (SQLiteException ex) {
Log.e(TAG, "Unable to close cursor", ex);
}
}
return logBlock;
}
}
private void updateBucketState(int bucketId) {
synchronized (database) {
Log.v(TAG, "Updating bucket id [" + bucketId + "]");
try {
if (updateBucketStateStatement == null) {
updateBucketStateStatement = database.compileStatement(PersistentLogStorageConstants.KAA_UPDATE_BUCKET_ID);
}
updateBucketStateStatement.bindString(1, PersistentLogStorageConstants.BUCKET_STATE_COLUMN);
updateBucketStateStatement.bindLong(2, bucketId);
updateBucketStateStatement.execute();
long affectedRows = getAffectedRowCount();
if (affectedRows > 0) {
Log.i(TAG, "Successfully updated state for bucket ID [" + bucketId + "] for log records: " + affectedRows);
} else {
Log.w(TAG, "No log records were updated");
}
} catch (SQLiteException ex) {
Log.e(TAG, "Failed to update state for bucket [" + bucketId + "]", ex);
}
}
}
@Override
public void removeBucket(int recordBlockId) {
synchronized (database) {
Log.d(TAG, "Removing record block with id [" + recordBlockId + "] from storage");
if (deleteByBucketIdStatement == null) {
try {
deleteByBucketIdStatement = database.compileStatement(PersistentLogStorageConstants.KAA_DELETE_BY_BUCKET_ID);
} catch (SQLiteException ex) {
Log.e(TAG, "Can't create record block deletion statement", ex);
throw new RuntimeException(ex);
}
}
try {
deleteByBucketIdStatement.bindLong(1, recordBlockId);
deleteByBucketIdStatement.execute();
long removedRecordsCount = getAffectedRowCount();
if (removedRecordsCount > 0) {
totalRecordCount -= removedRecordsCount;
Log.i(TAG, "Removed " + removedRecordsCount + " records from storage. Total log record count: " + totalRecordCount);
} else {
Log.i(TAG, "No records were removed from storage");
}
} catch (SQLiteException ex) {
Log.e(TAG, "Failed to remove record block with id [" + recordBlockId + "]", ex);
}
}
}
@Override
public void rollbackBucket(int bucketId) {
synchronized (database) {
Log.d(TAG, "Notifying upload fail for bucket id: " + bucketId);
if (resetBucketIdStatement == null) {
try {
resetBucketIdStatement = database.compileStatement(PersistentLogStorageConstants.KAA_RESET_BY_BUCKET_ID);
} catch (SQLiteException ex) {
Log.e(TAG, "Can't create bucket id reset statement", ex);
throw new RuntimeException(ex);
}
}
try {
resetBucketIdStatement.bindLong(1, bucketId);
resetBucketIdStatement.execute();
long affectedRows = getAffectedRowCount();
if (affectedRows > 0) {
Log.i(TAG, "Total " + affectedRows + " log records reset for bucket id: [" + bucketId + "]");
long previouslyConsumedSize = consumedMemoryStorage.remove(bucketId);
unmarkedConsumedSize += previouslyConsumedSize;
unmarkedRecordCount += affectedRows;
} else {
Log.i(TAG, "No log records for bucket with id: [" + bucketId + "]");
}
} catch (SQLiteException ex) {
Log.e(TAG, "Failed to reset bucket with id [" + bucketId + "]", ex);
}
}
}
@Override
public void close() {
tryCloseStatement(insertStatement);
tryCloseStatement(deleteByBucketIdStatement);
tryCloseStatement(resetBucketIdStatement);
tryCloseStatement(updateBucketStateStatement);
if (database != null) {
database.close();
}
if (dbHelper != null) {
dbHelper.close();
}
}
@Override
public long getConsumedVolume() {
return unmarkedConsumedSize;
}
@Override
public long getRecordCount() {
return unmarkedRecordCount;
}
private void moveToNextBucket() {
this.currentBucketSize = 0;
this.currentRecordCount = 0;
this.currentBucketId++;
}
private void retrieveBucketId() {
Cursor cursor = null;
try {
cursor = database.rawQuery(PersistentLogStorageConstants.KAA_SELECT_MAX_BUCKET_ID, null);
if (cursor.moveToFirst()) {
int currentBucketId = cursor.getInt(0);
if (currentBucketId == 0) {
Log.d(TAG, "Can't retrieve max bucket ID. Seems there is no logs");
return;
}
this.currentBucketId = ++currentBucketId;
}
} catch (SQLiteException ex) {
Log.e(TAG, "Can't create select max bucket ID statement", ex);
throw new RuntimeException("Can't create select max bucket ID statement");
} finally {
try {
tryCloseCursor(cursor);
} catch (SQLiteException ex) {
Log.e(TAG, "Unable to close cursor", ex);
}
}
}
private void retrieveConsumedSizeAndVolume() {
synchronized (database) {
Cursor cursor = null;
try {
cursor = database.rawQuery(PersistentLogStorageConstants.KAA_HOW_MANY_LOGS_IN_DB, null);
if (cursor.moveToFirst()) {
unmarkedRecordCount = totalRecordCount = cursor.getLong(0);
unmarkedConsumedSize = cursor.getLong(1);
Log.i(TAG, "Retrieved record count: " + totalRecordCount + ", consumed size: " + unmarkedConsumedSize);
} else {
Log.e(TAG, "Unable to retrieve consumed size and volume");
throw new RuntimeException("Unable to retrieve consumed size and volume");
}
} finally {
tryCloseCursor(cursor);
}
}
}
private void truncateIfBucketSizeIncompatible() {
Cursor cursor = null;
int lastSavedBucketSize = 0;
int lastSavedRecordCount = 0;
try {
cursor = database.rawQuery(PersistentLogStorageConstants.KAA_SELECT_STORAGE_INFO,
new String[]{PersistentLogStorageConstants.STORAGE_BUCKET_SIZE});
if (cursor.moveToFirst()) {
lastSavedBucketSize = cursor.getInt(0);
}
} catch (SQLiteException ex) {
Log.e(TAG, "Cannot retrieve storage param: bucketSize", ex);
throw new RuntimeException("Cannot retrieve storage param: bucketSize");
} finally {
tryCloseCursor(cursor);
}
try {
cursor = database.rawQuery(PersistentLogStorageConstants.KAA_SELECT_STORAGE_INFO,
new String[]{PersistentLogStorageConstants.STORAGE_RECORD_COUNT});
if (cursor.moveToFirst()) {
lastSavedRecordCount = cursor.getInt(0);
}
} catch (SQLiteException ex) {
Log.e(TAG, "Cannot retrieve storage param: recordCount", ex);
throw new RuntimeException("Cannot retrieve storage param: recordCount");
} finally {
tryCloseCursor(cursor);
}
try {
if (lastSavedBucketSize != maxBucketSize || lastSavedRecordCount != maxRecordCount) {
database.execSQL(PersistentLogStorageConstants.KAA_DELETE_ALL_DATA);
}
} catch (SQLiteException ex) {
Log.e(TAG, "Can't prepare delete statement", ex);
throw new RuntimeException("Can't prepare delete statement");
} finally {
tryCloseCursor(cursor);
}
updateStorageParams();
}
private void updateStorageParams() {
SQLiteStatement updateInfoStatement = null;
try {
updateInfoStatement = database.compileStatement(PersistentLogStorageConstants.KAA_UPDATE_STORAGE_INFO);
updateInfoStatement.bindString(1, PersistentLogStorageConstants.STORAGE_BUCKET_SIZE);
updateInfoStatement.bindLong(2, maxBucketSize);
updateInfoStatement.execute();
updateInfoStatement.bindString(1, PersistentLogStorageConstants.STORAGE_RECORD_COUNT);
updateInfoStatement.bindLong(2, maxRecordCount);
updateInfoStatement.execute();
} catch (SQLiteException ex) {
Log.e(TAG, "Can't prepare update storage info statement", ex);
throw new RuntimeException("Can't prepare update storage info statement");
} finally {
tryCloseStatement(updateInfoStatement);
}
}
private void resetBucketsState() {
synchronized (database) {
Log.d(TAG, "Resetting bucket ids on application start");
database.execSQL(PersistentLogStorageConstants.KAA_RESET_BUCKET_STATE_ON_START);
long updatedRows = getAffectedRowCount();
Log.v(TAG, "Number of rows affected: " + updatedRows);
}
}
private long getAffectedRowCount() {
synchronized (database) {
Cursor cursor = null;
try {
cursor = database.rawQuery(GET_CHANGES_QUERY, null);
if (cursor != null && cursor.getCount() > 0 && cursor.moveToFirst()) {
return cursor.getLong(cursor.getColumnIndex(CHANGES_QUERY_RESULT));
} else {
return 0;
}
} finally {
tryCloseCursor(cursor);
}
}
}
private void tryCloseCursor(Cursor cursor) {
if (cursor != null) {
cursor.close();
}
}
private void tryCloseStatement(SQLiteStatement statement) {
if (statement != null) {
statement.close();
}
}
}