Java tutorial
/* * 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. * * Copyright 2013 Near Infinity Corporation. */ package com.nearinfinity.honeycomb.hbase; import com.google.common.collect.ImmutableList; import com.google.common.collect.Lists; import com.google.inject.Inject; import com.google.inject.name.Named; import com.nearinfinity.honeycomb.hbase.config.ConfigConstants; import com.nearinfinity.honeycomb.hbase.rowkey.DataRowKey; import com.nearinfinity.honeycomb.hbase.rowkey.IndexRowKeyBuilder; import com.nearinfinity.honeycomb.hbase.rowkey.RowKey; import com.nearinfinity.honeycomb.hbase.rowkey.SortOrder; import com.nearinfinity.honeycomb.mysql.Row; import com.nearinfinity.honeycomb.mysql.schema.IndexSchema; import com.nearinfinity.honeycomb.mysql.schema.TableSchema; import com.nearinfinity.honeycomb.util.Verify; import org.apache.hadoop.hbase.client.Delete; import org.apache.hadoop.hbase.client.Put; import java.util.Collection; import java.util.List; import java.util.UUID; import static com.google.common.base.Preconditions.checkNotNull; /** * Creates put and deleteRow lists for various operations. Meant to have no * side effects except for requesting metadata from the store. */ public class MutationFactory { private final HBaseStore store; private byte[] columnFamily; @Inject public MutationFactory(HBaseStore store) { super(); this.store = store; } /** * Sets the column family. Cannot be injected into the constructor directly * because of a bug in Cobertura. Called automatically by Guice. * * @param columnFamily The column family to use */ @Inject public void setColumnFamily(final @Named(ConfigConstants.COLUMN_FAMILY) String columnFamily) { this.columnFamily = columnFamily.getBytes(); } /** * Build put list for a row insert with indices * * @param tableId * @param row * @return The list of put mutations */ public List<Put> insert(long tableId, final Row row) { return insert(tableId, row, store.getSchema(tableId).getIndices()); } /** * Build put list for a row insert with specified indices * * @param tableId * @param row * @param indices * @return The list of put mutations */ public List<Put> insert(long tableId, final Row row, final Collection<IndexSchema> indices) { checkNotNull(row); // tableId, indices checked by called methods final byte[] serializedRow = row.serialize(); final UUID uuid = row.getUUID(); final ImmutableList.Builder<Put> puts = ImmutableList.builder(); puts.add(emptyQualifierPut(new DataRowKey(tableId, uuid), serializedRow)); puts.addAll(insertIndices(tableId, row, indices)); return puts.build(); } /** * Build put list for inserting only the specified indices of the row * * @param tableId * @param row * @param indices * @return The list of put mutations */ public List<Put> insertIndices(long tableId, final Row row, final Collection<IndexSchema> indices) { checkNotNull(row); final byte[] serializedRow = row.serialize(); final ImmutableList.Builder<Put> puts = ImmutableList.builder(); doToIndices(tableId, row, indices, new IndexAction() { @Override public void execute(IndexRowKeyBuilder builder) { puts.add(emptyQualifierPut(builder.withSortOrder(SortOrder.Ascending).build(), serializedRow)); puts.add(emptyQualifierPut(builder.withSortOrder(SortOrder.Descending).build(), serializedRow)); } }); return puts.build(); } /** * Build delete list for the data and indices belonging to the row * * @param tableId * @param row * @return The list of delete mutations */ public List<Delete> delete(long tableId, final Row row) { List<Delete> deletes = deleteIndices(tableId, row); deletes.add(new Delete(new DataRowKey(tableId, row.getUUID()).encode())); return deletes; } /** * Build delete list for the indices belonging to the row * * @param tableId * @param row * @return The list of delete mutations */ public List<Delete> deleteIndices(long tableId, final Row row) { Verify.isValidId(tableId); final Collection<IndexSchema> indices = store.getSchema(tableId).getIndices(); return deleteIndices(tableId, row, indices); } /** * Build delete list for the specified indices belonging to the row * * @param tableId * @param row * @param indices * @return The list of delete mutations */ public List<Delete> deleteIndices(long tableId, final Row row, final Collection<IndexSchema> indices) { Verify.isValidId(tableId); checkNotNull(row); final List<Delete> deletes = Lists.newLinkedList(); doToIndices(tableId, row, indices, new IndexAction() { @Override public void execute(IndexRowKeyBuilder builder) { deletes.add(new Delete(builder.withSortOrder(SortOrder.Ascending).build().encode())); deletes.add(new Delete(builder.withSortOrder(SortOrder.Descending).build().encode())); } }); return deletes; } private Put emptyQualifierPut(final RowKey rowKey, final byte[] serializedRow) { return new Put(rowKey.encode()).add(columnFamily, new byte[0], serializedRow); } private void doToIndices(long tableId, final Row row, final Collection<IndexSchema> indices, final IndexAction action) { for (IndexSchema index : indices) { long indexId = store.getIndexId(tableId, index.getIndexName()); TableSchema schema = store.getSchema(tableId); IndexRowKeyBuilder builder = IndexRowKeyBuilder.newBuilder(tableId, indexId).withUUID(row.getUUID()) .withRow(row, index.getIndexName(), schema); action.execute(builder); } } private interface IndexAction { public void execute(IndexRowKeyBuilder builder); } }