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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.
*/
package org.apache.drill.exec.planner.fragment;
import java.util.Iterator;
import java.util.List;
import org.apache.drill.exec.physical.base.Exchange;
import org.apache.drill.exec.physical.base.PhysicalOperator;
import org.apache.drill.exec.work.foreman.ForemanSetupException;
import org.apache.drill.shaded.guava.com.google.common.collect.Lists;
public class Fragment implements Iterable<Fragment.ExchangeFragmentPair> {
static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(Fragment.class);
private PhysicalOperator root;
private ExchangeFragmentPair sendingExchange;
private final List<ExchangeFragmentPair> receivingExchangePairs = Lists.newLinkedList();
/**
* Set the given operator as root operator of this fragment. If root operator is already set,
* then this method call is a no-op.
* @param o new root operator
*/
public void addOperator(PhysicalOperator o) {
if (root == null) {
root = o;
}
// TODO should complain otherwise
}
public void addSendExchange(Exchange e, Fragment sendingToFragment) throws ForemanSetupException{
if (sendingExchange != null) {
throw new ForemanSetupException("Fragment was trying to add a second SendExchange. ");
}
addOperator(e);
sendingExchange = new ExchangeFragmentPair(e, sendingToFragment);
}
public void addReceiveExchange(Exchange e, Fragment fragment) {
this.receivingExchangePairs.add(new ExchangeFragmentPair(e, fragment));
}
@Override
public Iterator<ExchangeFragmentPair> iterator() {
return this.receivingExchangePairs.iterator();
}
public List<ExchangeFragmentPair> getReceivingExchangePairs() {
return receivingExchangePairs;
}
public PhysicalOperator getRoot() {
return root;
}
public Exchange getSendingExchange() {
if (sendingExchange != null) {
return sendingExchange.exchange;
}
return null;
}
public ExchangeFragmentPair getSendingExchangePair() {
return sendingExchange;
}
// public <T, V> T accept(FragmentVisitor<T, V> visitor, V extra) {
// return visitor.visit(this, extra);
// }
public class ExchangeFragmentPair {
private Exchange exchange;
private Fragment node;
public ExchangeFragmentPair(Exchange exchange, Fragment node) {
super();
this.exchange = exchange;
this.node = node;
}
public Exchange getExchange() {
return exchange;
}
public Fragment getNode() {
return node;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((exchange == null) ? 0 : exchange.hashCode());
result = prime * result + ((node == null) ? 0 : node.hashCode());
return result;
}
@Override
public String toString() {
return "ExchangeFragmentPair [exchange=" + exchange + "]";
}
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((receivingExchangePairs == null) ? 0 : receivingExchangePairs.hashCode());
result = prime * result + ((root == null) ? 0 : root.hashCode());
result = prime * result + ((sendingExchange == null) ? 0 : sendingExchange.getExchange().hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj == null) {
return false;
}
if (getClass() != obj.getClass()) {
return false;
}
Fragment other = (Fragment) obj;
if (receivingExchangePairs == null) {
if (other.receivingExchangePairs != null) {
return false;
}
} else if (!receivingExchangePairs.equals(other.receivingExchangePairs)) {
return false;
}
if (root == null) {
if (other.root != null) {
return false;
}
} else if (!root.equals(other.root)) {
return false;
}
if (sendingExchange == null) {
if (other.sendingExchange != null) {
return false;
}
} else if (!sendingExchange.equals(other.sendingExchange)) {
return false;
}
return true;
}
@Override
public String toString() {
return "FragmentNode [root=" + root + ", sendingExchange=" + sendingExchange + ", receivingExchangePairs="
+ receivingExchangePairs + "]";
}
}
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