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Introduces pruning and skipping on the raft log interface and implements it for all available raft logs. Pruning is used for deleting a prefix of the log (due to local compaction). Skipping is used for skipping a suffix of the log (due to remote compaction). The physical raft log now puts prevLogIndex and prevLogTerm in the continuation record to track all types of jumps (truncation, skipping) so that the history for log matching always is available from that point. An actual pruner that continually prunes according to some configured strategy is not in place at this point.
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community/kernel/src/main/java/org/neo4j/helpers/Reference.java
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/* | ||
* Copyright (c) 2002-2016 "Neo Technology," | ||
* Network Engine for Objects in Lund AB [http://neotechnology.com] | ||
* | ||
* This file is part of Neo4j. | ||
* | ||
* Neo4j is free software: you can redistribute it and/or modify | ||
* it under the terms of the GNU General Public License as published by | ||
* the Free Software Foundation, either version 3 of the License, or | ||
* (at your option) any later version. | ||
* | ||
* This program is distributed in the hope that it will be useful, | ||
* but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
* GNU General Public License for more details. | ||
* | ||
* You should have received a copy of the GNU General Public License | ||
* along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
*/ | ||
package org.neo4j.helpers; | ||
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public class Reference<T> | ||
{ | ||
private T t; | ||
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public Reference( T initial ) | ||
{ | ||
this.t = initial; | ||
} | ||
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public void set( T t ) | ||
{ | ||
this.t = t; | ||
} | ||
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public T get() | ||
{ | ||
return t; | ||
} | ||
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@Override | ||
public String toString() | ||
{ | ||
return t.toString(); | ||
} | ||
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@Override | ||
public boolean equals( Object obj ) | ||
{ | ||
return t.equals( obj ); | ||
} | ||
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@Override | ||
public int hashCode() | ||
{ | ||
return t.hashCode(); | ||
} | ||
} |
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47 changes: 47 additions & 0 deletions
47
community/primitive-collections/src/main/java/org/neo4j/cursor/CursorValue.java
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/* | ||
* Copyright (c) 2002-2016 "Neo Technology," | ||
* Network Engine for Objects in Lund AB [http://neotechnology.com] | ||
* | ||
* This file is part of Neo4j. | ||
* | ||
* Neo4j is free software: you can redistribute it and/or modify | ||
* it under the terms of the GNU General Public License as published by | ||
* the Free Software Foundation, either version 3 of the License, or | ||
* (at your option) any later version. | ||
* | ||
* This program is distributed in the hope that it will be useful, | ||
* but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
* GNU General Public License for more details. | ||
* | ||
* You should have received a copy of the GNU General Public License | ||
* along with this program. If not, see <http://www.gnu.org/licenses/>. | ||
*/ | ||
package org.neo4j.cursor; | ||
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public class CursorValue<T> | ||
{ | ||
private boolean valid = false; | ||
private T t; | ||
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public void set( T newT ) | ||
{ | ||
t = newT; | ||
valid = true; | ||
} | ||
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public T get() | ||
{ | ||
if( valid ) | ||
{ | ||
return t; | ||
} | ||
throw new IllegalStateException(); | ||
} | ||
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public void invalidate() | ||
{ | ||
valid = false; | ||
t = null; | ||
} | ||
} |
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