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package com.jcabi.dynamo;
import com.amazonaws.AmazonClientException;
import com.amazonaws.services.dynamodbv2.AmazonDynamoDB;
import com.amazonaws.services.dynamodbv2.model.AttributeValue;
import com.amazonaws.services.dynamodbv2.model.DeleteItemRequest;
import com.amazonaws.services.dynamodbv2.model.DeleteItemResult;
import com.amazonaws.services.dynamodbv2.model.DescribeTableRequest;
import com.amazonaws.services.dynamodbv2.model.DescribeTableResult;
import com.amazonaws.services.dynamodbv2.model.KeySchemaElement;
import com.amazonaws.services.dynamodbv2.model.PutItemRequest;
import com.amazonaws.services.dynamodbv2.model.PutItemResult;
import com.amazonaws.services.dynamodbv2.model.ReturnConsumedCapacity;
import com.amazonaws.services.dynamodbv2.model.ReturnValue;
import com.jcabi.aspects.Cacheable;
import com.jcabi.aspects.Immutable;
import com.jcabi.aspects.Loggable;
import com.jcabi.immutable.Array;
import com.jcabi.log.Logger;
import java.io.IOException;
import java.util.Collection;
import java.util.LinkedList;
import java.util.Map;
import lombok.EqualsAndHashCode;
import lombok.ToString;
/**
* Single table in Dynamo, through AWS SDK.
*
* @since 0.1
*/
@Immutable
@Loggable(Loggable.DEBUG)
@ToString
@EqualsAndHashCode(of = { "credentials", "reg", "self" })
@SuppressWarnings("PMD.GuardLogStatement")
final class AwsTable implements Table {
/**
* AWS credentials.
*/
private final transient Credentials credentials;
/**
* Region.
*/
private final transient Region reg;
/**
* Table name.
*/
private final transient String self;
/**
* Public ctor.
* @param creds Credentials
* @param region Region
* @param table Table name
*/
AwsTable(final Credentials creds, final Region region,
final String table) {
this.credentials = creds;
this.reg = region;
this.self = table;
}
@Override
public Item put(final Map attributes)
throws IOException {
final AmazonDynamoDB aws = this.credentials.aws();
try {
final PutItemRequest request = new PutItemRequest();
request.setTableName(this.self);
request.setItem(attributes);
request.setReturnValues(ReturnValue.NONE);
request.setReturnConsumedCapacity(ReturnConsumedCapacity.TOTAL);
final PutItemResult result = aws.putItem(request);
final long start = System.currentTimeMillis();
Logger.info(
this, "#put('%[text]s'): created item in '%s', %s, in %[ms]s",
attributes, this.self,
new PrintableConsumedCapacity(
result.getConsumedCapacity()
).print(),
System.currentTimeMillis() - start
);
return new AwsItem(
this.credentials,
this.frame(),
this.self,
new Attributes(attributes).only(this.keys()),
new Array<>(this.keys())
);
} catch (final AmazonClientException ex) {
throw new IOException(
String.format(
"Failed to put into \"%s\" with %s",
this.self, attributes
),
ex
);
} finally {
aws.shutdown();
}
}
@Override
public Region region() {
return this.reg;
}
@Override
public AwsFrame frame() {
return new AwsFrame(this.credentials, this, this.self);
}
@Override
public String name() {
return this.self;
}
/**
* Get names of keys.
* @return Names of attributes, which are primary keys
* @throws IOException If DynamoDB fails
*/
@Cacheable(forever = true)
public Collection keys() throws IOException {
final AmazonDynamoDB aws = this.credentials.aws();
try {
final long start = System.currentTimeMillis();
final DescribeTableResult result = aws.describeTable(
new DescribeTableRequest().withTableName(this.self)
);
final Collection keys = new LinkedList<>();
for (final KeySchemaElement key
: result.getTable().getKeySchema()) {
keys.add(key.getAttributeName());
}
Logger.info(
this, "#keys(): table %s described, in %[ms]s",
this.self, System.currentTimeMillis() - start
);
return keys;
} catch (final AmazonClientException ex) {
throw new IOException(
String.format(
"Failed to describe \"%s\"",
this.self
),
ex
);
} finally {
aws.shutdown();
}
}
@Override
public void delete(final Map attributes)
throws IOException {
final AmazonDynamoDB aws = this.credentials.aws();
try {
final DeleteItemRequest request = new DeleteItemRequest();
request.setTableName(this.self);
request.setKey(attributes);
request.setReturnValues(ReturnValue.NONE);
request.setReturnConsumedCapacity(ReturnConsumedCapacity.TOTAL);
final DeleteItemResult result = aws.deleteItem(request);
final long start = System.currentTimeMillis();
Logger.info(
this,
"#delete('%[text]s'): deleted item in '%s', %s, in %[ms]s",
attributes, this.self,
new PrintableConsumedCapacity(
result.getConsumedCapacity()
).print(),
System.currentTimeMillis() - start
);
} catch (final AmazonClientException ex) {
throw new IOException(
String.format(
"Failed to delete at \"%s\" by keys %s",
this.self, attributes
),
ex
);
} finally {
aws.shutdown();
}
}
}
