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* 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.
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package com.datastax.dse.driver.internal.core.cql.continuous;
import com.datastax.dse.driver.api.core.cql.continuous.ContinuousAsyncResultSet;
import com.datastax.oss.driver.api.core.cql.ColumnDefinitions;
import com.datastax.oss.driver.api.core.cql.ExecutionInfo;
import com.datastax.oss.driver.api.core.cql.Row;
import com.datastax.oss.driver.internal.core.cql.EmptyColumnDefinitions;
import com.datastax.oss.driver.internal.core.util.CountingIterator;
import edu.umd.cs.findbugs.annotations.NonNull;
import java.util.Collections;
import java.util.concurrent.CompletionStage;
import net.jcip.annotations.NotThreadSafe;
@NotThreadSafe // wraps a mutable queue
public class DefaultContinuousAsyncResultSet implements ContinuousAsyncResultSet {
private final Iterable currentPage;
private final ColumnDefinitions columnDefinitions;
private final int pageNumber;
private final boolean hasMorePages;
private final ExecutionInfo executionInfo;
private final ContinuousCqlRequestHandler handler;
private final CountingIterator iterator;
public DefaultContinuousAsyncResultSet(
CountingIterator iterator,
ColumnDefinitions columnDefinitions,
int pageNumber,
boolean hasMorePages,
ExecutionInfo executionInfo,
ContinuousCqlRequestHandler handler) {
this.columnDefinitions = columnDefinitions;
this.pageNumber = pageNumber;
this.hasMorePages = hasMorePages;
this.executionInfo = executionInfo;
this.handler = handler;
this.iterator = iterator;
this.currentPage = () -> iterator;
}
@NonNull
@Override
public ColumnDefinitions getColumnDefinitions() {
return columnDefinitions;
}
@Override
public boolean wasApplied() {
// always return true for non-conditional updates
return true;
}
@NonNull
@Override
public ExecutionInfo getExecutionInfo() {
return executionInfo;
}
@Override
public int pageNumber() {
return pageNumber;
}
@Override
public boolean hasMorePages() {
return hasMorePages;
}
@NonNull
@Override
public Iterable currentPage() {
return currentPage;
}
@Override
public int remaining() {
return iterator.remaining();
}
@NonNull
@Override
public CompletionStage fetchNextPage() throws IllegalStateException {
if (!hasMorePages()) {
throw new IllegalStateException(
"Can't call fetchNextPage() on the last page (use hasMorePages() to check)");
}
return handler.fetchNextPage();
}
@Override
public void cancel() {
handler.cancel();
}
public static ContinuousAsyncResultSet empty(ExecutionInfo executionInfo) {
return new ContinuousAsyncResultSet() {
@NonNull
@Override
public ColumnDefinitions getColumnDefinitions() {
return EmptyColumnDefinitions.INSTANCE;
}
@NonNull
@Override
public ExecutionInfo getExecutionInfo() {
return executionInfo;
}
@NonNull
@Override
public Iterable currentPage() {
return Collections.emptyList();
}
@Override
public int remaining() {
return 0;
}
@Override
public boolean hasMorePages() {
return false;
}
@Override
public int pageNumber() {
return 1;
}
@NonNull
@Override
public CompletionStage fetchNextPage()
throws IllegalStateException {
throw new IllegalStateException(
"Can't call fetchNextPage() on the last page (use hasMorePages() to check)");
}
@Override
public void cancel() {
// noop
}
@Override
public boolean wasApplied() {
// always true
return true;
}
};
}
}