googleapis
diff --git a/‎google-cloud-bigquerystorage/src/main/java/com/google/cloud/bigquery/storage/v1alpha2/DirectWriter.java‎
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diff --git a/‎google-cloud-bigquerystorage/src/main/java/com/google/cloud/bigquery/storage/v1alpha2/SchemaCompact.java‎
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+/*
+ * Copyright 2020 Google LLC
+ *
+ * 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 com.google.cloud.bigquery.storage.v1alpha2;
+
+import com.google.api.core.*;
+import com.google.api.gax.grpc.GrpcStatusCode;
+import com.google.api.gax.rpc.InvalidArgumentException;
+import com.google.cloud.bigquery.storage.v1alpha2.ProtoBufProto.ProtoRows;
+import com.google.cloud.bigquery.storage.v1alpha2.Storage.AppendRowsRequest;
+import com.google.common.annotations.VisibleForTesting;
+import com.google.common.util.concurrent.MoreExecutors;
+import com.google.protobuf.Descriptors;
+import com.google.protobuf.Message;
+import io.grpc.Status;
+import java.io.IOException;
+import java.util.List;
+import java.util.concurrent.locks.Lock;
+import java.util.concurrent.locks.ReentrantLock;
+import java.util.logging.Logger;
+
+/**
+ * Writer that can help user to write data to BigQuery. This is a simplified version of the Write
+ * API. For users writing with COMMITTED stream and don't care about row deduplication, it is
+ * recommended to use this Writer.
+ *
+ * <pre>{@code
+ * DataProto data;
+ * ApiFuture<Long> response = DirectWriter.<DataProto>append("projects/pid/datasets/did/tables/tid", Arrays.asList(data1));
+ * }</pre>
+ *
+ * <p>{@link DirectWriter} will use the credentials set on the channel, which uses application
+ * default credentials through {@link GoogleCredentials#getApplicationDefault} by default.
+ */
+public class DirectWriter {
+  private static final Logger LOG = Logger.getLogger(DirectWriter.class.getName());
+  private static WriterCache cache = null;
+  private static Lock cacheLock = new ReentrantLock();
+
+  /**
+   * Append rows to the given table.
+   *
+   * @param tableName table name in the form of "projects/{pName}/datasets/{dName}/tables/{tName}"
+   * @param protoRows rows in proto buffer format.
+   * @return A future that contains the offset at which the append happened. Only when the future
+   *     returns with valid offset, then the append actually happened.
+   * @throws IOException, InterruptedException, InvalidArgumentException
+   */
+  public static <T extends Message> ApiFuture<Long> append(String tableName, List<T> protoRows)
+      throws IOException, InterruptedException, InvalidArgumentException {
+    if (protoRows.isEmpty()) {
+      throw new InvalidArgumentException(
+          new Exception("Empty rows are not allowed"),
+          GrpcStatusCode.of(Status.Code.INVALID_ARGUMENT),
+          false);
+    }
+    try {
+      cacheLock.lock();
+      if (cache == null) {
+        cache = WriterCache.getInstance();
+      }
+    } finally {
+      cacheLock.unlock();
+    }
+
+    StreamWriter writer = cache.getTableWriter(tableName, protoRows.get(0).getDescriptorForType());
+    ProtoRows.Builder rowsBuilder = ProtoRows.newBuilder();
+    Descriptors.Descriptor descriptor = null;
+    for (Message protoRow : protoRows) {
+      rowsBuilder.addSerializedRows(protoRow.toByteString());
+    }
+
+    AppendRowsRequest.ProtoData.Builder data = AppendRowsRequest.ProtoData.newBuilder();
+    data.setWriterSchema(ProtoSchemaConverter.convert(protoRows.get(0).getDescriptorForType()));
+    data.setRows(rowsBuilder.build());
+
+    return ApiFutures.<Storage.AppendRowsResponse, Long>transform(
+        writer.append(AppendRowsRequest.newBuilder().setProtoRows(data.build()).build()),
+        new ApiFunction<Storage.AppendRowsResponse, Long>() {
+          @Override
+          public Long apply(Storage.AppendRowsResponse appendRowsResponse) {
+            return Long.valueOf(appendRowsResponse.getOffset());
+          }
+        },
+        MoreExecutors.directExecutor());
+  }
+
+  @VisibleForTesting
+  public static void testSetStub(
+      BigQueryWriteClient stub, int maxTableEntry, SchemaCompact schemaCheck) {
+    cache = WriterCache.getTestInstance(stub, maxTableEntry, schemaCheck);
+  }
+}
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+/*
+ * Copyright 2020 Google LLC
+ *
+ * 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 com.google.cloud.bigquery.storage.v1alpha2;
+
+import com.google.cloud.bigquery.BigQuery;
+import com.google.cloud.bigquery.Schema;
+import com.google.cloud.bigquery.Table;
+import com.google.cloud.bigquery.TableId;
+import com.google.cloud.bigquery.testing.RemoteBigQueryHelper;
+import com.google.common.annotations.VisibleForTesting;
+import com.google.protobuf.Descriptors;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+/**
+ * A class that checks the schema compatibility between user schema in proto descriptor and Bigquery
+ * table schema. If this check is passed, then user can write to BigQuery table using the user
+ * schema, otherwise the write will fail.
+ *
+ * <p>The implementation as of now is not complete, which measn, if this check passed, there is
+ * still a possbility of writing will fail.
+ */
+public class SchemaCompact {
+  private BigQuery bigquery;
+  private static SchemaCompact compact;
+  private static String tablePatternString = "projects/([^/]+)/datasets/([^/]+)/tables/([^/]+)";
+  private static Pattern tablePattern = Pattern.compile(tablePatternString);
+
+  private SchemaCompact(BigQuery bigquery) {
+    this.bigquery = bigquery;
+  }
+
+  /**
+   * Gets a singleton {code SchemaCompact} object.
+   *
+   * @return
+   */
+  public static SchemaCompact getInstance() {
+    if (compact == null) {
+      RemoteBigQueryHelper bigqueryHelper = RemoteBigQueryHelper.create();
+      compact = new SchemaCompact(bigqueryHelper.getOptions().getService());
+    }
+    return compact;
+  }
+
+  /**
+   * Gets a {code SchemaCompact} object with custom BigQuery stub.
+   *
+   * @param bigquery
+   * @return
+   */
+  @VisibleForTesting
+  public static SchemaCompact getInstance(BigQuery bigquery) {
+    return new SchemaCompact(bigquery);
+  }
+
+  private TableId getTableId(String tableName) {
+    Matcher matcher = tablePattern.matcher(tableName);
+    if (!matcher.matches() || matcher.groupCount() != 3) {
+      throw new IllegalArgumentException("Invalid table name: " + tableName);
+    }
+    return TableId.of(matcher.group(1), matcher.group(2), matcher.group(3));
+  }
+
+  /**
+   * Checks if the userSchema is compatible with the table's current schema for writing. The current
+   * implementatoin is not complete. If the check failed, the write couldn't succeed.
+   *
+   * @param tableName The name of the table to write to.
+   * @param userSchema The schema user uses to append data.
+   * @throws IllegalArgumentException the check failed.
+   */
+  public void check(String tableName, Descriptors.Descriptor userSchema)
+      throws IllegalArgumentException {
+    Table table = bigquery.getTable(getTableId(tableName));
+    Schema schema = table.getDefinition().getSchema();
+    // TODO: We only have very limited check here. More checks to be added.
+    if (schema.getFields().size() != userSchema.getFields().size()) {
+      throw new IllegalArgumentException(
+          "User schema doesn't have expected field number with BigQuery table schema, expected: "
+              + schema.getFields().size()
+              + " actual: "
+              + userSchema.getFields().size());
+    }
+  }
+}