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Support pagination when single index query (#328)
Support pagination when single index query Change-Id: Iab355a9f68cebd8ebc666cf126842eb19fa40240
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103 changes: 103 additions & 0 deletions
103
hugegraph-core/src/main/java/com/baidu/hugegraph/backend/page/IdHolder.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,103 @@ | ||
| /* | ||
| * Copyright 2017 HugeGraph Authors | ||
| * | ||
| * 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 com.baidu.hugegraph.backend.page; | ||
|
|
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| import java.util.Set; | ||
| import java.util.function.Function; | ||
|
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| import com.baidu.hugegraph.backend.id.Id; | ||
| import com.baidu.hugegraph.backend.query.ConditionQuery; | ||
| import com.baidu.hugegraph.util.E; | ||
| import com.baidu.hugegraph.util.InsertionOrderUtil; | ||
| import com.google.common.collect.ImmutableSet; | ||
|
|
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| public final class IdHolder { | ||
|
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| private final ConditionQuery query; | ||
| private final Function<ConditionQuery, PageIds> idsFetcher; | ||
| private boolean exhausted; | ||
|
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| private Set<Id> ids; | ||
|
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| /** | ||
| * For non-paging situation | ||
| */ | ||
| public IdHolder(Set<Id> ids) { | ||
| this.query = null; | ||
| this.idsFetcher = null; | ||
| this.exhausted = false; | ||
| if (ids instanceof ImmutableSet) { | ||
| this.ids = InsertionOrderUtil.newSet(ids); | ||
| } else { | ||
| this.ids = ids; | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| * For paging situation | ||
| */ | ||
| public IdHolder(ConditionQuery query, | ||
| Function<ConditionQuery, PageIds> idsFetcher) { | ||
| E.checkArgument(query.paging(), | ||
| "Query '%s' must include page info", query); | ||
| this.query = query.copy(); | ||
| this.idsFetcher = idsFetcher; | ||
| this.exhausted = false; | ||
| this.ids = null; | ||
| } | ||
|
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| public void merge(Set<Id> ids) { | ||
| this.ids.addAll(ids); | ||
| } | ||
|
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| public Set<Id> ids() { | ||
| E.checkNotNull(this.ids, "ids"); | ||
| return this.ids; | ||
| } | ||
|
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| public int size() { | ||
| if (this.ids == null) { | ||
| return 0; | ||
| } | ||
| return this.ids.size(); | ||
| } | ||
|
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| public boolean paging() { | ||
| return this.idsFetcher != null; | ||
| } | ||
|
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| public PageIds fetchNext(String page, long pageSize) { | ||
| if (this.exhausted) { | ||
| return PageIds.EMPTY; | ||
| } | ||
|
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| this.query.page(page); | ||
| this.query.limit(pageSize); | ||
|
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| PageIds result = this.idsFetcher.apply(this.query); | ||
|
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| assert result != null; | ||
| this.ids = result.ids(); | ||
| if (this.ids.size() != this.query.limit() || result.page() == null) { | ||
| this.exhausted = true; | ||
| } | ||
| return result; | ||
| } | ||
| } |
71 changes: 71 additions & 0 deletions
71
hugegraph-core/src/main/java/com/baidu/hugegraph/backend/page/IdHolderList.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,71 @@ | ||
| /* | ||
| * Copyright 2017 HugeGraph Authors | ||
| * | ||
| * 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 com.baidu.hugegraph.backend.page; | ||
|
|
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| import java.util.ArrayList; | ||
| import java.util.Collection; | ||
|
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| import com.baidu.hugegraph.util.E; | ||
|
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| public final class IdHolderList extends ArrayList<IdHolder> { | ||
|
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| private final boolean paging; | ||
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| public IdHolderList(boolean paging) { | ||
| this.paging = paging; | ||
| } | ||
|
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| public boolean paging() { | ||
| return this.paging; | ||
| } | ||
|
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| @Override | ||
| public boolean add(IdHolder holder) { | ||
| E.checkArgument(this.paging == holder.paging(), | ||
| "The IdHolder to be linked must be " + | ||
| "in same paging mode"); | ||
| if (this.paging || this.isEmpty()) { | ||
| super.add(holder); | ||
| } else { | ||
| assert this.size() == 1; | ||
| IdHolder self = this.get(0); | ||
| assert !self.paging(); | ||
| self.merge(holder.ids()); | ||
| } | ||
| return true; | ||
| } | ||
|
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| @Override | ||
| public boolean addAll(Collection<? extends IdHolder> idHolders) { | ||
| for (IdHolder idHolder : idHolders) { | ||
| this.add(idHolder); | ||
| } | ||
| return true; | ||
| } | ||
|
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| public int idsSize() { | ||
| if (this.paging || this.isEmpty()) { | ||
| return 0; | ||
| } else { | ||
| assert this.size() == 1; | ||
| return this.get(0).size(); | ||
| } | ||
| } | ||
| } |
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