/
TableDataWriteChannel.java
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/
TableDataWriteChannel.java
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/*
* Copyright 2015 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;
import static com.google.cloud.RetryHelper.runWithRetries;
import com.google.cloud.BaseWriteChannel;
import com.google.cloud.RestorableState;
import com.google.cloud.RetryHelper;
import com.google.cloud.WriteChannel;
import java.util.List;
import java.util.Objects;
import java.util.concurrent.Callable;
/**
* {@link WriteChannel} implementation to stream data into a BigQuery table. Use {@link #getJob()}
* to get the job used to insert streamed data. Please notice that {@link #getJob()} returns {@code
* null} until the channel is closed.
*/
public class TableDataWriteChannel
extends BaseWriteChannel<BigQueryOptions, WriteChannelConfiguration> {
private Job job;
TableDataWriteChannel(
BigQueryOptions options, JobId jobId, WriteChannelConfiguration writeChannelConfiguration) {
this(options, writeChannelConfiguration, open(options, jobId, writeChannelConfiguration));
}
TableDataWriteChannel(
BigQueryOptions options, WriteChannelConfiguration config, String uploadId) {
super(options, config, uploadId);
}
@Override
protected void flushBuffer(final int length, final boolean last) {
try {
com.google.api.services.bigquery.model.Job jobPb =
runWithRetries(
new Callable<com.google.api.services.bigquery.model.Job>() {
@Override
public com.google.api.services.bigquery.model.Job call() {
return getOptions()
.getBigQueryRpcV2()
.write(getUploadId(), getBuffer(), 0, getPosition(), length, last);
}
},
getOptions().getRetrySettings(),
BigQueryBaseService.BIGQUERY_EXCEPTION_HANDLER,
getOptions().getClock());
job = jobPb != null ? Job.fromPb(getOptions().getService(), jobPb) : null;
} catch (RetryHelper.RetryHelperException e) {
throw BigQueryException.translateAndThrow(e);
}
}
@Override
protected StateImpl.Builder stateBuilder() {
return StateImpl.builder(getOptions(), getEntity(), getUploadId(), job);
}
private static String open(
final BigQueryOptions options,
final JobId jobId,
final WriteChannelConfiguration writeChannelConfiguration) {
try {
return runWithRetries(
new Callable<String>() {
@Override
public String call() {
return options
.getBigQueryRpcV2()
.open(
new com.google.api.services.bigquery.model.Job()
.setConfiguration(writeChannelConfiguration.toPb())
.setJobReference(jobId.toPb()));
}
},
options.getRetrySettings(),
BigQueryBaseService.BIGQUERY_EXCEPTION_HANDLER,
options.getClock());
} catch (RetryHelper.RetryHelperException e) {
throw BigQueryException.translateAndThrow(e);
}
}
private void setJob(Job job) {
this.job = job;
}
/**
* Returns the {@code Job} created to insert the rows. The job is available only once the upload
* finished and the channel was closed, returns {@code null} otherwise.
*/
public Job getJob() {
return job;
}
static class StateImpl
extends BaseWriteChannel.BaseState<BigQueryOptions, WriteChannelConfiguration> {
private static final long serialVersionUID = -2692851818766876346L;
private final Job job;
StateImpl(Builder builder) {
super(builder);
this.job = builder.job;
}
static class Builder
extends BaseWriteChannel.BaseState.Builder<BigQueryOptions, WriteChannelConfiguration> {
private final Job job;
private Builder(
BigQueryOptions options,
WriteChannelConfiguration configuration,
String uploadId,
Job job) {
super(options, configuration, uploadId);
this.job = job;
}
public RestorableState<WriteChannel> build() {
return new StateImpl(this);
}
}
static Builder builder(
BigQueryOptions options, WriteChannelConfiguration config, String uploadId, Job job) {
return new Builder(options, config, uploadId, job);
}
@Override
public WriteChannel restore() {
TableDataWriteChannel channel = new TableDataWriteChannel(serviceOptions, entity, uploadId);
channel.restore(this);
channel.setJob(job);
return channel;
}
@Override
public int hashCode() {
return Objects.hash(super.hashCode(), job);
}
@Override
public boolean equals(Object obj) {
return super.equals(obj)
&& obj instanceof StateImpl
&& Objects.equals(job, ((StateImpl) obj).job);
}
@Override
protected List<ValueHolder> toStringHelper() {
List<ValueHolder> valueList = super.toStringHelper();
valueList.add(ValueHolder.create("job", job));
return valueList;
}
}
}